[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_metal.m

```c
gth:sizeof(args) atIndex:0];
        [enc setBuffer:gatebuf offset:ds4_gpu_tensor_offset(gate) atIndex:1];
        [enc setBuffer:upbuf offset:ds4_gpu_tensor_offset(up) atIndex:2];
        [enc setBuffer:outbuf offset:ds4_gpu_tensor_offset(out) atIndex:3];
        [enc dispatchThreadgroups:MTLSizeMake(1, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "SwiGLU")) return 0;
    }

    return 1;
}

int ds4_gpu_add_tensor(
        ds4_gpu_tensor       *out,
        const ds4_gpu_tensor *a,
        const ds4_gpu_tensor *b,
        uint32_t                n) {
    if (!g_initialized && !ds4_gpu_init()) return 0;
    if (!out || !a || !b || n == 0) return 0;

    @autoreleasepool {
        id<MTLBuffer> abuf = ds4_gpu_tensor_buffer(a);
        id<MTLBuffer> bbuf = ds4_gpu_tensor_buffer(b);
        id<MTLBuffer> outbuf = ds4_gpu_tensor_buffer(out);
        const uint64_t bytes = (uint64_t)n * sizeof(float);
        if (!abuf || !bbuf || !outbuf ||
            ds4_gpu_tensor_bytes(a) < bytes ||
            ds4_gpu_tensor_bytes(b) < bytes ||
            ds4_gpu_tensor_bytes(out) < bytes) {
            fprintf(stderr, "ds4: Metal tensor add received undersized buffers\n");
            return 0;
        }

        int owned = 0;
        id<MTLCommandBuffer> cb = ds4_gpu_command_buffer(&owned);
        if (!cb) return 0;

        const uint64_t row_bytes = (uint64_t)n * sizeof(float);
        ds4_gpu_bin_args args = {
            .ne00 = (int32_t)n,
            .ne01 = 1,
            .ne02 = 1,
            .ne03 = 1,
            .nb00 = sizeof(float),
            .nb01 = row_bytes,
            .nb02 = row_bytes,
            .nb03 = row_bytes,
            .ne10 = (int32_t)n,
            .ne11 = 1,
            .ne12 = 1,
            .ne13 = 1,
            .nb10 = sizeof(float),
            .nb11 = row_bytes,
            .nb12 = row_bytes,
            .nb13 = row_bytes,
            .ne0 = (int32_t)n,
            .ne1 = 1,
            .ne2 = 1,
            .ne3 = 1,
            .nb0 = sizeof(float),
            .nb1 = row_bytes,
            .nb2 = row_bytes,
            .nb3 = row_bytes,
            .offs = 0,
            .o1 = { 0 },
        };
        NSUInteger nth_max = g_add_pipeline.maxTotalThreadsPerThreadgroup;
        if (nth_max > 256u) nth_max = 256u;
        NSUInteger nth = 1;
        while (2u * nth < (NSUInteger)args.ne0 && nth < nth_max) {
            nth *= 2u;
        }
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_metal.m

```c
gth:sizeof(args) atIndex:0];
        [enc setBuffer:gatebuf offset:ds4_gpu_tensor_offset(gate) atIndex:1];
        [enc setBuffer:upbuf offset:ds4_gpu_tensor_offset(up) atIndex:2];
        [enc setBuffer:outbuf offset:ds4_gpu_tensor_offset(out) atIndex:3];
        [enc dispatchThreadgroups:MTLSizeMake(1, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "SwiGLU")) return 0;
    }

    return 1;
}

int ds4_gpu_add_tensor(
        ds4_gpu_tensor       *out,
        const ds4_gpu_tensor *a,
        const ds4_gpu_tensor *b,
        uint32_t                n) {
    if (!g_initialized && !ds4_gpu_init()) return 0;
    if (!out || !a || !b || n == 0) return 0;

    @autoreleasepool {
        id<MTLBuffer> abuf = ds4_gpu_tensor_buffer(a);
        id<MTLBuffer> bbuf = ds4_gpu_tensor_buffer(b);
        id<MTLBuffer> outbuf = ds4_gpu_tensor_buffer(out);
        const uint64_t bytes = (uint64_t)n * sizeof(float);
        if (!abuf || !bbuf || !outbuf ||
            ds4_gpu_tensor_bytes(a) < bytes ||
            ds4_gpu_tensor_bytes(b) < bytes ||
            ds4_gpu_tensor_bytes(out) < bytes) {
            fprintf(stderr, "ds4: Metal tensor add received undersized buffers\n");
            return 0;
        }

        int owned = 0;
        id<MTLCommandBuffer> cb = ds4_gpu_command_buffer(&owned);
        if (!cb) return 0;

        const uint64_t row_bytes = (uint64_t)n * sizeof(float);
        ds4_gpu_bin_args args = {
            .ne00 = (int32_t)n,
            .ne01 = 1,
            .ne02 = 1,
            .ne03 = 1,
            .nb00 = sizeof(float),
            .nb01 = row_bytes,
            .nb02 = row_bytes,
            .nb03 = row_bytes,
            .ne10 = (int32_t)n,
            .ne11 = 1,
            .ne12 = 1,
            .ne13 = 1,
            .nb10 = sizeof(float),
            .nb11 = row_bytes,
            .nb12 = row_bytes,
            .nb13 = row_bytes,
            .ne0 = (int32_t)n,
            .ne1 = 1,
            .ne2 = 1,
            .ne3 = 1,
            .nb0 = sizeof(float),
            .nb1 = row_bytes,
            .nb2 = row_bytes,
            .nb3 = row_bytes,
            .offs = 0,
            .o1 = { 0 },
        };
        NSUInteger nth_max = g_add_pipeline.maxTotalThreadsPerThreadgroup;
        if (nth_max > 256u) nth_max = 256u;
        NSUInteger nth = 1;
        while (2u * nth < (NSUInteger)args.ne0 && nth < nth_max) {
            nth *= 2u;
        }
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
v4_compressor_store_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_sort_i32_rows_asc_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_rb4_pipeline;
static id<MTLComputePipelineState> g_dsv4_softplus_sqrt_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_finalize_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_weights_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_hc_expand4_pipeline;
static NSMutableDictionary<NSString *, id<MTLComputePipelineState>> *g_pipeline_cache;
static NSMutableDictionary<NSString *, id<MTLBuffer>> *g_model_buffer_cache;
static NSMutableArray<id<MTLBuffer>> *g_transient_buffers;
static id g_model_residency_set;
static id<MTLBuffer> g_flash_attn_mask_buffer;
static id<MTLBuffer> g_flash_attn_pad_buffer;
static id<MTLBuffer> g_flash_attn_tmp_buffer;
static id<MTLBuffer> g_flash_attn_blk_buffer;
static id<MTLBuffer> g_flash_attn_ring_buffer;
static id<MTLBuffer> g_flash_attn_kv_buffer;
static id<MTLBuffer> g_compressor_pool_kv_buffer;
static id<MTLBuffer> g_compressor_pool_score_buffer;
static id<MTLBuffer> g_compressor_pool_score_cont_buffer;
static id<MTLBuffer> g_compressor_pool_softmax_buffer;
static id<MTLBuffer> g_compressor_pool_product_buffer;
static id<MTLBuffer> g_compressor_store_ape_buffer;
static id<MTLBuffer> g_compressor_store_score_buffer;
static id<MTLBuffer> g_embed_rows_buffer;
static id<MTLBuffer> g_router_selection_buffer;
static id<MTLBuffer> g_router_weight_sum_buffer;
static id<MTLBuffer> g_indexer_head_scores_buffer;
static id<MTLBuffer> g_indexer_topk_buffer;
static id<MTLBuffer> g_indexed_topk_buffer;
static id<MTLBuffer> g_f16_round_scratch_buffer;
static id<MTLBuffer> g_raw_store_round_buffer;
static id<MTLBuffer> g_moe_gate_scratch_buffer;
static id<MTLBuffer> g_moe_down_scratch_buffer;
static id<MTLBuffer> g_moe_id_map_buffer;
static id<MTLBuffer> g_attn_out_group_ids_buffer;
static const void *g_model_map_ptr;
static uint64_t g_model_map_size;
static uint64_t g_model_mapped_offset;
static uint64_t g_model_mapped_size;
static uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
v4_compressor_store_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_sort_i32_rows_asc_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_rb4_pipeline;
static id<MTLComputePipelineState> g_dsv4_softplus_sqrt_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_finalize_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_weights_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_hc_expand4_pipeline;
static NSMutableDictionary<NSString *, id<MTLComputePipelineState>> *g_pipeline_cache;
static NSMutableDictionary<NSString *, id<MTLBuffer>> *g_model_buffer_cache;
static NSMutableArray<id<MTLBuffer>> *g_transient_buffers;
static id g_model_residency_set;
static id<MTLBuffer> g_flash_attn_mask_buffer;
static id<MTLBuffer> g_flash_attn_pad_buffer;
static id<MTLBuffer> g_flash_attn_tmp_buffer;
static id<MTLBuffer> g_flash_attn_blk_buffer;
static id<MTLBuffer> g_flash_attn_ring_buffer;
static id<MTLBuffer> g_flash_attn_kv_buffer;
static id<MTLBuffer> g_compressor_pool_kv_buffer;
static id<MTLBuffer> g_compressor_pool_score_buffer;
static id<MTLBuffer> g_compressor_pool_score_cont_buffer;
static id<MTLBuffer> g_compressor_pool_softmax_buffer;
static id<MTLBuffer> g_compressor_pool_product_buffer;
static id<MTLBuffer> g_compressor_store_ape_buffer;
static id<MTLBuffer> g_compressor_store_score_buffer;
static id<MTLBuffer> g_embed_rows_buffer;
static id<MTLBuffer> g_router_selection_buffer;
static id<MTLBuffer> g_router_weight_sum_buffer;
static id<MTLBuffer> g_indexer_head_scores_buffer;
static id<MTLBuffer> g_indexer_topk_buffer;
static id<MTLBuffer> g_indexed_topk_buffer;
static id<MTLBuffer> g_f16_round_scratch_buffer;
static id<MTLBuffer> g_raw_store_round_buffer;
static id<MTLBuffer> g_moe_gate_scratch_buffer;
static id<MTLBuffer> g_moe_down_scratch_buffer;
static id<MTLBuffer> g_moe_id_map_buffer;
static id<MTLBuffer> g_attn_out_group_ids_buffer;
static const void *g_model_map_ptr;
static uint64_t g_model_map_size;
static uint64_t g_model_mapped_offset;
static uint64_t g_model_mapped_size;
static uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
v4_compressor_store_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_sort_i32_rows_asc_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_rb4_pipeline;
static id<MTLComputePipelineState> g_dsv4_softplus_sqrt_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_finalize_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_weights_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_hc_expand4_pipeline;
static NSMutableDictionary<NSString *, id<MTLComputePipelineState>> *g_pipeline_cache;
static NSMutableDictionary<NSString *, id<MTLBuffer>> *g_model_buffer_cache;
static NSMutableArray<id<MTLBuffer>> *g_transient_buffers;
static id g_model_residency_set;
static id<MTLBuffer> g_flash_attn_mask_buffer;
static id<MTLBuffer> g_flash_attn_pad_buffer;
static id<MTLBuffer> g_flash_attn_tmp_buffer;
static id<MTLBuffer> g_flash_attn_blk_buffer;
static id<MTLBuffer> g_flash_attn_ring_buffer;
static id<MTLBuffer> g_flash_attn_kv_buffer;
static id<MTLBuffer> g_compressor_pool_kv_buffer;
static id<MTLBuffer> g_compressor_pool_score_buffer;
static id<MTLBuffer> g_compressor_pool_score_cont_buffer;
static id<MTLBuffer> g_compressor_pool_softmax_buffer;
static id<MTLBuffer> g_compressor_pool_product_buffer;
static id<MTLBuffer> g_compressor_store_ape_buffer;
static id<MTLBuffer> g_compressor_store_score_buffer;
static id<MTLBuffer> g_embed_rows_buffer;
static id<MTLBuffer> g_router_selection_buffer;
static id<MTLBuffer> g_router_weight_sum_buffer;
static id<MTLBuffer> g_indexer_head_scores_buffer;
static id<MTLBuffer> g_indexer_topk_buffer;
static id<MTLBuffer> g_indexed_topk_buffer;
static id<MTLBuffer> g_f16_round_scratch_buffer;
static id<MTLBuffer> g_raw_store_round_buffer;
static id<MTLBuffer> g_moe_gate_scratch_buffer;
static id<MTLBuffer> g_moe_down_scratch_buffer;
static id<MTLBuffer> g_moe_id_map_buffer;
static id<MTLBuffer> g_attn_out_group_ids_buffer;
static const void *g_model_map_ptr;
static uint64_t g_model_map_size;
static uint64_t g_model_mapped_offset;
static uint64_t g_model_mapped_size;
static uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
v4_compressor_store_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_sort_i32_rows_asc_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_pipeline;
static id<MTLComputePipelineState> g_dsv4_indexed_attention_heads8_rb4_pipeline;
static id<MTLComputePipelineState> g_dsv4_softplus_sqrt_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_finalize_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_router_weights_one_pipeline;
static id<MTLComputePipelineState> g_dsv4_hc_expand4_pipeline;
static NSMutableDictionary<NSString *, id<MTLComputePipelineState>> *g_pipeline_cache;
static NSMutableDictionary<NSString *, id<MTLBuffer>> *g_model_buffer_cache;
static NSMutableArray<id<MTLBuffer>> *g_transient_buffers;
static id g_model_residency_set;
static id<MTLBuffer> g_flash_attn_mask_buffer;
static id<MTLBuffer> g_flash_attn_pad_buffer;
static id<MTLBuffer> g_flash_attn_tmp_buffer;
static id<MTLBuffer> g_flash_attn_blk_buffer;
static id<MTLBuffer> g_flash_attn_ring_buffer;
static id<MTLBuffer> g_flash_attn_kv_buffer;
static id<MTLBuffer> g_compressor_pool_kv_buffer;
static id<MTLBuffer> g_compressor_pool_score_buffer;
static id<MTLBuffer> g_compressor_pool_score_cont_buffer;
static id<MTLBuffer> g_compressor_pool_softmax_buffer;
static id<MTLBuffer> g_compressor_pool_product_buffer;
static id<MTLBuffer> g_compressor_store_ape_buffer;
static id<MTLBuffer> g_compressor_store_score_buffer;
static id<MTLBuffer> g_embed_rows_buffer;
static id<MTLBuffer> g_router_selection_buffer;
static id<MTLBuffer> g_router_weight_sum_buffer;
static id<MTLBuffer> g_indexer_head_scores_buffer;
static id<MTLBuffer> g_indexer_topk_buffer;
static id<MTLBuffer> g_indexed_topk_buffer;
static id<MTLBuffer> g_f16_round_scratch_buffer;
static id<MTLBuffer> g_raw_store_round_buffer;
static id<MTLBuffer> g_moe_gate_scratch_buffer;
static id<MTLBuffer> g_moe_down_scratch_buffer;
static id<MTLBuffer> g_moe_id_map_buffer;
static id<MTLBuffer> g_attn_out_group_ids_buffer;
static const void *g_model_map_ptr;
static uint64_t g_model_map_size;
static uint64_t g_model_mapped_offset;
static uint64_t g_model_mapped_size;
static uint64_t g_tensor_alloc_live_bytes;
static uint64_t g_tensor_alloc_peak_bytes;
static uint64_t g_model_wrap_count;
static uint64_t g_model_wrap_bytes;
static uint64_t g_model_wrap_max_bytes;
static uint64_t g_model_residency_count;
static NSUInteger g_flash_attn_mask_bytes;
static NSUInteger g_flash_attn_pad_bytes;
static NSUInteger g_flash_attn_tmp_bytes;
static NSUInteger g_flash_attn_blk_bytes;
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
stride to warm model-backed pages without copying the\n"
"// model. This is outside inference and exists only to reduce first-use stalls.\n"
"kernel void kernel_touch_u8_stride(\n"
"        device const uchar    *src        [[buffer(0)]],\n"
"        device uchar          *dst        [[buffer(1)]],\n"
"        constant ulong        &stride     [[buffer(2)]],\n"
"        constant ulong        &bytes      [[buffer(3)]],\n"
"        constant ulong        &dst_offset [[buffer(4)]],\n"
"        uint gid [[thread_position_in_grid]]) {\n"
"    ulong off = (ulong)gid * stride;\n"
"    if (off >= bytes) return;\n"
"    dst[dst_offset + (ulong)gid] = src[off];\n"
"}\n"
"\n"
"enum ds4_sort_order {\n"
"    DS4_SORT_ORDER_ASC,\n"
"    DS4_SORT_ORDER_DESC,\n"
"};\n"
"\n"
"struct block_q8_0 {\n"
"    half d;\n"
"    int8_t qs[QK8_0];\n"
"};\n"
"\n"
"\n";

static NSString *ds4_gpu_full_source(void) {
    NSString *base = [NSString stringWithUTF8String:ds4_gpu_source];
    NSFileManager *fm = [NSFileManager defaultManager];
    /*
     * Kernels are kept as separate files for review, then concatenated into one
     * Metal library.  Environment overrides are still honored so a diagnostic
     * run can swap one source file without changing the executable.
     */
    NSArray<NSArray<NSString *> *> *required_sources = @[
        @[@"DS4_METAL_FLASH_ATTN_SOURCE", @"metal/flash_attn.metal"],
        @[@"DS4_METAL_DENSE_SOURCE",      @"metal/dense.metal"],
        @[@"DS4_METAL_MOE_SOURCE",        @"metal/moe.metal"],
        @[@"DS4_METAL_DSV4_HC_SOURCE",    @"metal/dsv4_hc.metal"],
        @[@"DS4_METAL_UNARY_SOURCE",      @"metal/unary.metal"],
        @[@"DS4_METAL_DSV4_KV_SOURCE",    @"metal/dsv4_kv.metal"],
        @[@"DS4_METAL_DSV4_ROPE_SOURCE",  @"metal/dsv4_rope.metal"],
        @[@"DS4_METAL_DSV4_MISC_SOURCE",  @"metal/dsv4_misc.metal"],
        @[@"DS4_METAL_ARGSORT_SOURCE",    @"metal/argsort.metal"],
        @[@"DS4_METAL_CPY_SOURCE",        @"metal/cpy.metal"],
        @[@"DS4_METAL_CONCAT_SOURCE",     @"metal/concat.metal"],
        @[@"DS4_METAL_GET_ROWS_SOURCE",   @"metal/get_rows.metal"],
        @[@"DS4_METAL_SUM_ROWS_SOURCE",   @"metal/sum_rows.metal"],
        @[@"DS4_METAL_SOFTMAX_SOURCE",    @"metal/softmax.metal"],
        @[@"DS4_METAL_REPEAT_SOURCE",     @"metal/repeat.metal"],
        @[@"DS4_METAL_GLU_SOURCE",        @"metal/glu.metal"],
        @[@"DS4_METAL_NORM_SOURCE",       @"metal/norm.metal"],
        @[@"DS4_METAL_BIN_SOURCE",        @"metal/bin.metal"],
        @[@"DS4_METAL_SET_ROWS_SOURCE",   @"metal/set_rows.metal"],
    ];
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
stride to warm model-backed pages without copying the\n"
"// model. This is outside inference and exists only to reduce first-use stalls.\n"
"kernel void kernel_touch_u8_stride(\n"
"        device const uchar    *src        [[buffer(0)]],\n"
"        device uchar          *dst        [[buffer(1)]],\n"
"        constant ulong        &stride     [[buffer(2)]],\n"
"        constant ulong        &bytes      [[buffer(3)]],\n"
"        constant ulong        &dst_offset [[buffer(4)]],\n"
"        uint gid [[thread_position_in_grid]]) {\n"
"    ulong off = (ulong)gid * stride;\n"
"    if (off >= bytes) return;\n"
"    dst[dst_offset + (ulong)gid] = src[off];\n"
"}\n"
"\n"
"enum ds4_sort_order {\n"
"    DS4_SORT_ORDER_ASC,\n"
"    DS4_SORT_ORDER_DESC,\n"
"};\n"
"\n"
"struct block_q8_0 {\n"
"    half d;\n"
"    int8_t qs[QK8_0];\n"
"};\n"
"\n"
"\n";

static NSString *ds4_gpu_full_source(void) {
    NSString *base = [NSString stringWithUTF8String:ds4_gpu_source];
    NSFileManager *fm = [NSFileManager defaultManager];
    /*
     * Kernels are kept as separate files for review, then concatenated into one
     * Metal library.  Environment overrides are still honored so a diagnostic
     * run can swap one source file without changing the executable.
     */
    NSArray<NSArray<NSString *> *> *required_sources = @[
        @[@"DS4_METAL_FLASH_ATTN_SOURCE", @"metal/flash_attn.metal"],
        @[@"DS4_METAL_DENSE_SOURCE",      @"metal/dense.metal"],
        @[@"DS4_METAL_MOE_SOURCE",        @"metal/moe.metal"],
        @[@"DS4_METAL_DSV4_HC_SOURCE",    @"metal/dsv4_hc.metal"],
        @[@"DS4_METAL_UNARY_SOURCE",      @"metal/unary.metal"],
        @[@"DS4_METAL_DSV4_KV_SOURCE",    @"metal/dsv4_kv.metal"],
        @[@"DS4_METAL_DSV4_ROPE_SOURCE",  @"metal/dsv4_rope.metal"],
        @[@"DS4_METAL_DSV4_MISC_SOURCE",  @"metal/dsv4_misc.metal"],
        @[@"DS4_METAL_ARGSORT_SOURCE",    @"metal/argsort.metal"],
        @[@"DS4_METAL_CPY_SOURCE",        @"metal/cpy.metal"],
        @[@"DS4_METAL_CONCAT_SOURCE",     @"metal/concat.metal"],
        @[@"DS4_METAL_GET_ROWS_SOURCE",   @"metal/get_rows.metal"],
        @[@"DS4_METAL_SUM_ROWS_SOURCE",   @"metal/sum_rows.metal"],
        @[@"DS4_METAL_SOFTMAX_SOURCE",    @"metal/softmax.metal"],
        @[@"DS4_METAL_REPEAT_SOURCE",     @"metal/repeat.metal"],
        @[@"DS4_METAL_GLU_SOURCE",        @"metal/glu.metal"],
        @[@"DS4_METAL_NORM_SOURCE",       @"metal/norm.metal"],
        @[@"DS4_METAL_BIN_SOURCE",        @"metal/bin.metal"],
        @[@"DS4_METAL_SET_ROWS_SOURCE",   @"metal/set_rows.metal"],
    ];
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
stride to warm model-backed pages without copying the\n"
"// model. This is outside inference and exists only to reduce first-use stalls.\n"
"kernel void kernel_touch_u8_stride(\n"
"        device const uchar    *src        [[buffer(0)]],\n"
"        device uchar          *dst        [[buffer(1)]],\n"
"        constant ulong        &stride     [[buffer(2)]],\n"
"        constant ulong        &bytes      [[buffer(3)]],\n"
"        constant ulong        &dst_offset [[buffer(4)]],\n"
"        uint gid [[thread_position_in_grid]]) {\n"
"    ulong off = (ulong)gid * stride;\n"
"    if (off >= bytes) return;\n"
"    dst[dst_offset + (ulong)gid] = src[off];\n"
"}\n"
"\n"
"enum ds4_sort_order {\n"
"    DS4_SORT_ORDER_ASC,\n"
"    DS4_SORT_ORDER_DESC,\n"
"};\n"
"\n"
"struct block_q8_0 {\n"
"    half d;\n"
"    int8_t qs[QK8_0];\n"
"};\n"
"\n"
"\n";

static NSString *ds4_gpu_full_source(void) {
    NSString *base = [NSString stringWithUTF8String:ds4_gpu_source];
    NSFileManager *fm = [NSFileManager defaultManager];
    /*
     * Kernels are kept as separate files for review, then concatenated into one
     * Metal library.  Environment overrides are still honored so a diagnostic
     * run can swap one source file without changing the executable.
     */
    NSArray<NSArray<NSString *> *> *required_sources = @[
        @[@"DS4_METAL_FLASH_ATTN_SOURCE", @"metal/flash_attn.metal"],
        @[@"DS4_METAL_DENSE_SOURCE",      @"metal/dense.metal"],
        @[@"DS4_METAL_MOE_SOURCE",        @"metal/moe.metal"],
        @[@"DS4_METAL_DSV4_HC_SOURCE",    @"metal/dsv4_hc.metal"],
        @[@"DS4_METAL_UNARY_SOURCE",      @"metal/unary.metal"],
        @[@"DS4_METAL_DSV4_KV_SOURCE",    @"metal/dsv4_kv.metal"],
        @[@"DS4_METAL_DSV4_ROPE_SOURCE",  @"metal/dsv4_rope.metal"],
        @[@"DS4_METAL_DSV4_MISC_SOURCE",  @"metal/dsv4_misc.metal"],
        @[@"DS4_METAL_ARGSORT_SOURCE",    @"metal/argsort.metal"],
        @[@"DS4_METAL_CPY_SOURCE",        @"metal/cpy.metal"],
        @[@"DS4_METAL_CONCAT_SOURCE",     @"metal/concat.metal"],
        @[@"DS4_METAL_GET_ROWS_SOURCE",   @"metal/get_rows.metal"],
        @[@"DS4_METAL_SUM_ROWS_SOURCE",   @"metal/sum_rows.metal"],
        @[@"DS4_METAL_SOFTMAX_SOURCE",    @"metal/softmax.metal"],
        @[@"DS4_METAL_REPEAT_SOURCE",     @"metal/repeat.metal"],
        @[@"DS4_METAL_GLU_SOURCE",        @"metal/glu.metal"],
        @[@"DS4_METAL_NORM_SOURCE",       @"metal/norm.metal"],
        @[@"DS4_METAL_BIN_SOURCE",        @"metal/bin.metal"],
        @[@"DS4_METAL_SET_ROWS_SOURCE",   @"metal/set_rows.metal"],
    ];
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
stride to warm model-backed pages without copying the\n"
"// model. This is outside inference and exists only to reduce first-use stalls.\n"
"kernel void kernel_touch_u8_stride(\n"
"        device const uchar    *src        [[buffer(0)]],\n"
"        device uchar          *dst        [[buffer(1)]],\n"
"        constant ulong        &stride     [[buffer(2)]],\n"
"        constant ulong        &bytes      [[buffer(3)]],\n"
"        constant ulong        &dst_offset [[buffer(4)]],\n"
"        uint gid [[thread_position_in_grid]]) {\n"
"    ulong off = (ulong)gid * stride;\n"
"    if (off >= bytes) return;\n"
"    dst[dst_offset + (ulong)gid] = src[off];\n"
"}\n"
"\n"
"enum ds4_sort_order {\n"
"    DS4_SORT_ORDER_ASC,\n"
"    DS4_SORT_ORDER_DESC,\n"
"};\n"
"\n"
"struct block_q8_0 {\n"
"    half d;\n"
"    int8_t qs[QK8_0];\n"
"};\n"
"\n"
"\n";

static NSString *ds4_gpu_full_source(void) {
    NSString *base = [NSString stringWithUTF8String:ds4_gpu_source];
    NSFileManager *fm = [NSFileManager defaultManager];
    /*
     * Kernels are kept as separate files for review, then concatenated into one
     * Metal library.  Environment overrides are still honored so a diagnostic
     * run can swap one source file without changing the executable.
     */
    NSArray<NSArray<NSString *> *> *required_sources = @[
        @[@"DS4_METAL_FLASH_ATTN_SOURCE", @"metal/flash_attn.metal"],
        @[@"DS4_METAL_DENSE_SOURCE",      @"metal/dense.metal"],
        @[@"DS4_METAL_MOE_SOURCE",        @"metal/moe.metal"],
        @[@"DS4_METAL_DSV4_HC_SOURCE",    @"metal/dsv4_hc.metal"],
        @[@"DS4_METAL_UNARY_SOURCE",      @"metal/unary.metal"],
        @[@"DS4_METAL_DSV4_KV_SOURCE",    @"metal/dsv4_kv.metal"],
        @[@"DS4_METAL_DSV4_ROPE_SOURCE",  @"metal/dsv4_rope.metal"],
        @[@"DS4_METAL_DSV4_MISC_SOURCE",  @"metal/dsv4_misc.metal"],
        @[@"DS4_METAL_ARGSORT_SOURCE",    @"metal/argsort.metal"],
        @[@"DS4_METAL_CPY_SOURCE",        @"metal/cpy.metal"],
        @[@"DS4_METAL_CONCAT_SOURCE",     @"metal/concat.metal"],
        @[@"DS4_METAL_GET_ROWS_SOURCE",   @"metal/get_rows.metal"],
        @[@"DS4_METAL_SUM_ROWS_SOURCE",   @"metal/sum_rows.metal"],
        @[@"DS4_METAL_SOFTMAX_SOURCE",    @"metal/softmax.metal"],
        @[@"DS4_METAL_REPEAT_SOURCE",     @"metal/repeat.metal"],
        @[@"DS4_METAL_GLU_SOURCE",        @"metal/glu.metal"],
        @[@"DS4_METAL_NORM_SOURCE",       @"metal/norm.metal"],
        @[@"DS4_METAL_BIN_SOURCE",        @"metal/bin.metal"],
        @[@"DS4_METAL_SET_ROWS_SOURCE",   @"metal/set_rows.metal"],
    ];
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
dgroup;
        if (nth_max > 256u) nth_max = 256u;
        NSUInteger nth = 1;
        while (2u * nth < (NSUInteger)args.ne0 && nth < nth_max) {
            nth *= 2u;
        }

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:g_add_pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:abuf offset:ds4_gpu_tensor_offset(a) atIndex:1];
        [enc setBuffer:bbuf offset:ds4_gpu_tensor_offset(b) atIndex:2];
        [enc setBuffer:outbuf offset:ds4_gpu_tensor_offset(out) atIndex:3];
        [enc dispatchThreadgroups:MTLSizeMake(1, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "tensor add")) return 0;
    }

    return 1;
}

typedef struct {
    uint32_t width;
    uint32_t rows;
    uint32_t layer;
    uint32_t n_threads;
    float    scale;
} ds4_gpu_directional_steering_project_args;

int ds4_gpu_directional_steering_project_tensor(
        ds4_gpu_tensor       *x,
        const ds4_gpu_tensor *directions,
        uint32_t                layer,
        uint32_t                width,
        uint32_t                rows,
        float                   scale) {
    if (!g_initialized && !ds4_gpu_init()) return 0;
    if (!x || !directions || width == 0 || rows == 0 || scale == 0.0f) return 0;

    @autoreleasepool {
        id<MTLComputePipelineState> pipeline =
            ds4_gpu_get_pipeline("kernel_dsv4_directional_steering_project_f32");
        if (!pipeline) return 0;

        id<MTLBuffer> xbuf = ds4_gpu_tensor_buffer(x);
        id<MTLBuffer> dbuf = ds4_gpu_tensor_buffer(directions);
        const uint64_t x_bytes = (uint64_t)width * rows * sizeof(float);
        const uint64_t dir_bytes = (uint64_t)(layer + 1u) * width * sizeof(float);
        if (!xbuf || !dbuf ||
            ds4_gpu_tensor_bytes(x) < x_bytes ||
            ds4_gpu_tensor_bytes(directions) < dir_bytes) {
            fprintf(stderr, "ds4: Metal directional steering received undersized buffers\n");
            return 0;
        }

        int owned = 0;
        id<MTLCommandBuffer> cb = ds4_gpu_command_buffer(&owned);
        if (!cb) return 0;

        NSUInteger nth = pipeline.maxTotalThreadsPerThreadgroup;
        if (nth > 256u) nth = 256u;
        while (nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
dgroup;
        if (nth_max > 256u) nth_max = 256u;
        NSUInteger nth = 1;
        while (2u * nth < (NSUInteger)args.ne0 && nth < nth_max) {
            nth *= 2u;
        }

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:g_add_pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:abuf offset:ds4_gpu_tensor_offset(a) atIndex:1];
        [enc setBuffer:bbuf offset:ds4_gpu_tensor_offset(b) atIndex:2];
        [enc setBuffer:outbuf offset:ds4_gpu_tensor_offset(out) atIndex:3];
        [enc dispatchThreadgroups:MTLSizeMake(1, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "tensor add")) return 0;
    }

    return 1;
}

typedef struct {
    uint32_t width;
    uint32_t rows;
    uint32_t layer;
    uint32_t n_threads;
    float    scale;
} ds4_gpu_directional_steering_project_args;

int ds4_gpu_directional_steering_project_tensor(
        ds4_gpu_tensor       *x,
        const ds4_gpu_tensor *directions,
        uint32_t                layer,
        uint32_t                width,
        uint32_t                rows,
        float                   scale) {
    if (!g_initialized && !ds4_gpu_init()) return 0;
    if (!x || !directions || width == 0 || rows == 0 || scale == 0.0f) return 0;

    @autoreleasepool {
        id<MTLComputePipelineState> pipeline =
            ds4_gpu_get_pipeline("kernel_dsv4_directional_steering_project_f32");
        if (!pipeline) return 0;

        id<MTLBuffer> xbuf = ds4_gpu_tensor_buffer(x);
        id<MTLBuffer> dbuf = ds4_gpu_tensor_buffer(directions);
        const uint64_t x_bytes = (uint64_t)width * rows * sizeof(float);
        const uint64_t dir_bytes = (uint64_t)(layer + 1u) * width * sizeof(float);
        if (!xbuf || !dbuf ||
            ds4_gpu_tensor_bytes(x) < x_bytes ||
            ds4_gpu_tensor_bytes(directions) < dir_bytes) {
            fprintf(stderr, "ds4: Metal directional steering received undersized buffers\n");
            return 0;
        }

        int owned = 0;
        id<MTLCommandBuffer> cb = ds4_gpu_command_buffer(&owned);
        if (!cb) return 0;

        NSUInteger nth = pipeline.maxTotalThreadsPerThreadgroup;
        if (nth > 256u) nth = 256u;
        while (nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
dgroup;
        if (nth_max > 256u) nth_max = 256u;
        NSUInteger nth = 1;
        while (2u * nth < (NSUInteger)args.ne0 && nth < nth_max) {
            nth *= 2u;
        }

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:g_add_pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:abuf offset:ds4_gpu_tensor_offset(a) atIndex:1];
        [enc setBuffer:bbuf offset:ds4_gpu_tensor_offset(b) atIndex:2];
        [enc setBuffer:outbuf offset:ds4_gpu_tensor_offset(out) atIndex:3];
        [enc dispatchThreadgroups:MTLSizeMake(1, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "tensor add")) return 0;
    }

    return 1;
}

typedef struct {
    uint32_t width;
    uint32_t rows;
    uint32_t layer;
    uint32_t n_threads;
    float    scale;
} ds4_gpu_directional_steering_project_args;

int ds4_gpu_directional_steering_project_tensor(
        ds4_gpu_tensor       *x,
        const ds4_gpu_tensor *directions,
        uint32_t                layer,
        uint32_t                width,
        uint32_t                rows,
        float                   scale) {
    if (!g_initialized && !ds4_gpu_init()) return 0;
    if (!x || !directions || width == 0 || rows == 0 || scale == 0.0f) return 0;

    @autoreleasepool {
        id<MTLComputePipelineState> pipeline =
            ds4_gpu_get_pipeline("kernel_dsv4_directional_steering_project_f32");
        if (!pipeline) return 0;

        id<MTLBuffer> xbuf = ds4_gpu_tensor_buffer(x);
        id<MTLBuffer> dbuf = ds4_gpu_tensor_buffer(directions);
        const uint64_t x_bytes = (uint64_t)width * rows * sizeof(float);
        const uint64_t dir_bytes = (uint64_t)(layer + 1u) * width * sizeof(float);
        if (!xbuf || !dbuf ||
            ds4_gpu_tensor_bytes(x) < x_bytes ||
            ds4_gpu_tensor_bytes(directions) < dir_bytes) {
            fprintf(stderr, "ds4: Metal directional steering received undersized buffers\n");
            return 0;
        }

        int owned = 0;
        id<MTLCommandBuffer> cb = ds4_gpu_command_buffer(&owned);
        if (!cb) return 0;

        NSUInteger nth = pipeline.maxTotalThreadsPerThreadgroup;
        if (nth > 256u) nth = 256u;
        while (nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
dgroup;
        if (nth_max > 256u) nth_max = 256u;
        NSUInteger nth = 1;
        while (2u * nth < (NSUInteger)args.ne0 && nth < nth_max) {
            nth *= 2u;
        }

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:g_add_pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:abuf offset:ds4_gpu_tensor_offset(a) atIndex:1];
        [enc setBuffer:bbuf offset:ds4_gpu_tensor_offset(b) atIndex:2];
        [enc setBuffer:outbuf offset:ds4_gpu_tensor_offset(out) atIndex:3];
        [enc dispatchThreadgroups:MTLSizeMake(1, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "tensor add")) return 0;
    }

    return 1;
}

typedef struct {
    uint32_t width;
    uint32_t rows;
    uint32_t layer;
    uint32_t n_threads;
    float    scale;
} ds4_gpu_directional_steering_project_args;

int ds4_gpu_directional_steering_project_tensor(
        ds4_gpu_tensor       *x,
        const ds4_gpu_tensor *directions,
        uint32_t                layer,
        uint32_t                width,
        uint32_t                rows,
        float                   scale) {
    if (!g_initialized && !ds4_gpu_init()) return 0;
    if (!x || !directions || width == 0 || rows == 0 || scale == 0.0f) return 0;

    @autoreleasepool {
        id<MTLComputePipelineState> pipeline =
            ds4_gpu_get_pipeline("kernel_dsv4_directional_steering_project_f32");
        if (!pipeline) return 0;

        id<MTLBuffer> xbuf = ds4_gpu_tensor_buffer(x);
        id<MTLBuffer> dbuf = ds4_gpu_tensor_buffer(directions);
        const uint64_t x_bytes = (uint64_t)width * rows * sizeof(float);
        const uint64_t dir_bytes = (uint64_t)(layer + 1u) * width * sizeof(float);
        if (!xbuf || !dbuf ||
            ds4_gpu_tensor_bytes(x) < x_bytes ||
            ds4_gpu_tensor_bytes(directions) < dir_bytes) {
            fprintf(stderr, "ds4: Metal directional steering received undersized buffers\n");
            return 0;
        }

        int owned = 0;
        id<MTLCommandBuffer> cb = ds4_gpu_command_buffer(&owned);
        if (!cb) return 0;

        NSUInteger nth = pipeline.maxTotalThreadsPerThreadgroup;
        if (nth > 256u) nth = 256u;
        while (nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
            .layer = layer,
            .n_threads = (uint32_t)nth,
            .scale = scale,
        };

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:xbuf offset:ds4_gpu_tensor_offset(x) atIndex:1];
        [enc setBuffer:dbuf offset:ds4_gpu_tensor_offset(directions) atIndex:2];
        [enc setThreadgroupMemoryLength:nth * sizeof(float) atIndex:0];
        [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)rows, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "directional steering")) return 0;
    }

    return 1;
}

static NSUInteger ds4_gpu_bin_threads(uint32_t width, id<MTLComputePipelineState> pipeline) {
    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = 1u;
    while (2u * nth < (NSUInteger)width && nth < nth_max) nth *= 2u;
    return nth ? nth : 1u;
}

static int ds4_gpu_encode_unary_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        id<MTLBuffer>               src,
        NSUInteger                  src_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        uint32_t                    width,
        uint32_t                    rows,
        int                         c4,
        float                       min,
        float                       max) {
    if (!cb || !pipeline || !src || !dst || width == 0 || rows == 0) return 0;
    if (c4 && (width & 3u) != 0) return 0;

    ds4_gpu_unary_args args = ds4_gpu_make_unary_rows_args(width, rows, c4, 0.0f, 0.0f);
    args.min = min;
    args.max = max;

    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = (NSUInteger)args.ne00;
    if (nth > nth_max) nth = nth_max;
    if (nth == 0) nth = 1u;
    const NSUInteger nk0 = ((NSUInteger)args.ne00 + nth - 1u) / nth;

    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
            .layer = layer,
            .n_threads = (uint32_t)nth,
            .scale = scale,
        };

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:xbuf offset:ds4_gpu_tensor_offset(x) atIndex:1];
        [enc setBuffer:dbuf offset:ds4_gpu_tensor_offset(directions) atIndex:2];
        [enc setThreadgroupMemoryLength:nth * sizeof(float) atIndex:0];
        [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)rows, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "directional steering")) return 0;
    }

    return 1;
}

static NSUInteger ds4_gpu_bin_threads(uint32_t width, id<MTLComputePipelineState> pipeline) {
    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = 1u;
    while (2u * nth < (NSUInteger)width && nth < nth_max) nth *= 2u;
    return nth ? nth : 1u;
}

static int ds4_gpu_encode_unary_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        id<MTLBuffer>               src,
        NSUInteger                  src_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        uint32_t                    width,
        uint32_t                    rows,
        int                         c4,
        float                       min,
        float                       max) {
    if (!cb || !pipeline || !src || !dst || width == 0 || rows == 0) return 0;
    if (c4 && (width & 3u) != 0) return 0;

    ds4_gpu_unary_args args = ds4_gpu_make_unary_rows_args(width, rows, c4, 0.0f, 0.0f);
    args.min = min;
    args.max = max;

    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = (NSUInteger)args.ne00;
    if (nth > nth_max) nth = nth_max;
    if (nth == 0) nth = 1u;
    const NSUInteger nk0 = ((NSUInteger)args.ne00 + nth - 1u) / nth;

    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
            .layer = layer,
            .n_threads = (uint32_t)nth,
            .scale = scale,
        };

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:xbuf offset:ds4_gpu_tensor_offset(x) atIndex:1];
        [enc setBuffer:dbuf offset:ds4_gpu_tensor_offset(directions) atIndex:2];
        [enc setThreadgroupMemoryLength:nth * sizeof(float) atIndex:0];
        [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)rows, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "directional steering")) return 0;
    }

    return 1;
}

static NSUInteger ds4_gpu_bin_threads(uint32_t width, id<MTLComputePipelineState> pipeline) {
    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = 1u;
    while (2u * nth < (NSUInteger)width && nth < nth_max) nth *= 2u;
    return nth ? nth : 1u;
}

static int ds4_gpu_encode_unary_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        id<MTLBuffer>               src,
        NSUInteger                  src_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        uint32_t                    width,
        uint32_t                    rows,
        int                         c4,
        float                       min,
        float                       max) {
    if (!cb || !pipeline || !src || !dst || width == 0 || rows == 0) return 0;
    if (c4 && (width & 3u) != 0) return 0;

    ds4_gpu_unary_args args = ds4_gpu_make_unary_rows_args(width, rows, c4, 0.0f, 0.0f);
    args.min = min;
    args.max = max;

    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = (NSUInteger)args.ne00;
    if (nth > nth_max) nth = nth_max;
    if (nth == 0) nth = 1u;
    const NSUInteger nk0 = ((NSUInteger)args.ne00 + nth - 1u) / nth;

    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
nth > width && nth > 1u) nth >>= 1;
        if (nth == 0) nth = 1;

        ds4_gpu_directional_steering_project_args args = {
            .width = width,
            .rows = rows,
            .layer = layer,
            .n_threads = (uint32_t)nth,
            .scale = scale,
        };

        id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
        [enc setComputePipelineState:pipeline];
        [enc setBytes:&args length:sizeof(args) atIndex:0];
        [enc setBuffer:xbuf offset:ds4_gpu_tensor_offset(x) atIndex:1];
        [enc setBuffer:dbuf offset:ds4_gpu_tensor_offset(directions) atIndex:2];
        [enc setThreadgroupMemoryLength:nth * sizeof(float) atIndex:0];
        [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)rows, 1, 1)
             threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
        ds4_gpu_end_compute_encoder(cb, enc);

        if (!ds4_gpu_finish_command_buffer(cb, owned, "directional steering")) return 0;
    }

    return 1;
}

static NSUInteger ds4_gpu_bin_threads(uint32_t width, id<MTLComputePipelineState> pipeline) {
    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = 1u;
    while (2u * nth < (NSUInteger)width && nth < nth_max) nth *= 2u;
    return nth ? nth : 1u;
}

static int ds4_gpu_encode_unary_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        id<MTLBuffer>               src,
        NSUInteger                  src_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        uint32_t                    width,
        uint32_t                    rows,
        int                         c4,
        float                       min,
        float                       max) {
    if (!cb || !pipeline || !src || !dst || width == 0 || rows == 0) return 0;
    if (c4 && (width & 3u) != 0) return 0;

    ds4_gpu_unary_args args = ds4_gpu_make_unary_rows_args(width, rows, c4, 0.0f, 0.0f);
    args.min = min;
    args.max = max;

    NSUInteger nth_max = pipeline.maxTotalThreadsPerThreadgroup;
    if (nth_max > 256u) nth_max = 256u;
    NSUInteger nth = (NSUInteger)args.ne00;
    if (nth > nth_max) nth = nth_max;
    if (nth == 0) nth = 1u;
    const NSUInteger nk0 = ((NSUInteger)args.ne00 + nth - 1u) / nth;

    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
= ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
    [enc setBuffer:dst offset:dst_off atIndex:2];
    [enc dispatchThreadgroups:MTLSizeMake(nk0 * (NSUInteger)args.ne01,
                                          (NSUInteger)args.ne02,
                                          (NSUInteger)args.ne03)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static int ds4_gpu_encode_bin_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_bin_args   *args,
        id<MTLBuffer>               a,
        NSUInteger                  a_off,
        id<MTLBuffer>               b,
        NSUInteger                  b_off,
        id<MTLBuffer>               out,
        NSUInteger                  out_off) {
    if (!cb || !pipeline || !args || !a || !b || !out || args->ne0 <= 0 || args->ne1 <= 0) {
        return 0;
    }

    const NSUInteger nth = ds4_gpu_bin_threads((uint32_t)args->ne0, pipeline);
    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:args length:sizeof(*args) atIndex:0];
    [enc setBuffer:a offset:a_off atIndex:1];
    [enc setBuffer:b offset:b_off atIndex:2];
    [enc setBuffer:out offset:out_off atIndex:3];
    [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)args->ne1,
                                          (NSUInteger)args->ne2,
                                          (NSUInteger)args->ne3)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static ds4_gpu_bin_args ds4_gpu_make_bin_rowwise_scalar_args(uint32_t width, uint32_t rows) {
    const uint64_t lhs_row_bytes = (uint64_t)width * sizeof(float);
    const uint64_t rhs_row_bytes = sizeof(float);
    return (ds4_gpu_bin_args) {
        .ne00 = (int32_t)width,
        .ne01 = (int32_t)rows,
        .ne02 = 1,
        .ne03 = 1,
        .nb00 = sizeof(float),
        .nb01 = lhs_row_bytes,
        .nb02 = (uint64_t)rows * lhs_row_bytes,
        .nb03 = (uint64_t)rows * lhs_row_bytes,
        .ne10 = 1,
        .ne11 = (int32_t)rows,
        .ne12 = 1,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
= ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
    [enc setBuffer:dst offset:dst_off atIndex:2];
    [enc dispatchThreadgroups:MTLSizeMake(nk0 * (NSUInteger)args.ne01,
                                          (NSUInteger)args.ne02,
                                          (NSUInteger)args.ne03)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static int ds4_gpu_encode_bin_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_bin_args   *args,
        id<MTLBuffer>               a,
        NSUInteger                  a_off,
        id<MTLBuffer>               b,
        NSUInteger                  b_off,
        id<MTLBuffer>               out,
        NSUInteger                  out_off) {
    if (!cb || !pipeline || !args || !a || !b || !out || args->ne0 <= 0 || args->ne1 <= 0) {
        return 0;
    }

    const NSUInteger nth = ds4_gpu_bin_threads((uint32_t)args->ne0, pipeline);
    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:args length:sizeof(*args) atIndex:0];
    [enc setBuffer:a offset:a_off atIndex:1];
    [enc setBuffer:b offset:b_off atIndex:2];
    [enc setBuffer:out offset:out_off atIndex:3];
    [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)args->ne1,
                                          (NSUInteger)args->ne2,
                                          (NSUInteger)args->ne3)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static ds4_gpu_bin_args ds4_gpu_make_bin_rowwise_scalar_args(uint32_t width, uint32_t rows) {
    const uint64_t lhs_row_bytes = (uint64_t)width * sizeof(float);
    const uint64_t rhs_row_bytes = sizeof(float);
    return (ds4_gpu_bin_args) {
        .ne00 = (int32_t)width,
        .ne01 = (int32_t)rows,
        .ne02 = 1,
        .ne03 = 1,
        .nb00 = sizeof(float),
        .nb01 = lhs_row_bytes,
        .nb02 = (uint64_t)rows * lhs_row_bytes,
        .nb03 = (uint64_t)rows * lhs_row_bytes,
        .ne10 = 1,
        .ne11 = (int32_t)rows,
        .ne12 = 1,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
= ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
    [enc setBuffer:dst offset:dst_off atIndex:2];
    [enc dispatchThreadgroups:MTLSizeMake(nk0 * (NSUInteger)args.ne01,
                                          (NSUInteger)args.ne02,
                                          (NSUInteger)args.ne03)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static int ds4_gpu_encode_bin_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_bin_args   *args,
        id<MTLBuffer>               a,
        NSUInteger                  a_off,
        id<MTLBuffer>               b,
        NSUInteger                  b_off,
        id<MTLBuffer>               out,
        NSUInteger                  out_off) {
    if (!cb || !pipeline || !args || !a || !b || !out || args->ne0 <= 0 || args->ne1 <= 0) {
        return 0;
    }

    const NSUInteger nth = ds4_gpu_bin_threads((uint32_t)args->ne0, pipeline);
    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:args length:sizeof(*args) atIndex:0];
    [enc setBuffer:a offset:a_off atIndex:1];
    [enc setBuffer:b offset:b_off atIndex:2];
    [enc setBuffer:out offset:out_off atIndex:3];
    [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)args->ne1,
                                          (NSUInteger)args->ne2,
                                          (NSUInteger)args->ne3)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static ds4_gpu_bin_args ds4_gpu_make_bin_rowwise_scalar_args(uint32_t width, uint32_t rows) {
    const uint64_t lhs_row_bytes = (uint64_t)width * sizeof(float);
    const uint64_t rhs_row_bytes = sizeof(float);
    return (ds4_gpu_bin_args) {
        .ne00 = (int32_t)width,
        .ne01 = (int32_t)rows,
        .ne02 = 1,
        .ne03 = 1,
        .nb00 = sizeof(float),
        .nb01 = lhs_row_bytes,
        .nb02 = (uint64_t)rows * lhs_row_bytes,
        .nb03 = (uint64_t)rows * lhs_row_bytes,
        .ne10 = 1,
        .ne11 = (int32_t)rows,
        .ne12 = 1,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Explain what this code does and identify the inference stage it belongs to.

File: ds4_metal.m

```c
= ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:&args length:sizeof(args) atIndex:0];
    [enc setBuffer:src offset:src_off atIndex:1];
    [enc setBuffer:dst offset:dst_off atIndex:2];
    [enc dispatchThreadgroups:MTLSizeMake(nk0 * (NSUInteger)args.ne01,
                                          (NSUInteger)args.ne02,
                                          (NSUInteger)args.ne03)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static int ds4_gpu_encode_bin_f32_rows(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_bin_args   *args,
        id<MTLBuffer>               a,
        NSUInteger                  a_off,
        id<MTLBuffer>               b,
        NSUInteger                  b_off,
        id<MTLBuffer>               out,
        NSUInteger                  out_off) {
    if (!cb || !pipeline || !args || !a || !b || !out || args->ne0 <= 0 || args->ne1 <= 0) {
        return 0;
    }

    const NSUInteger nth = ds4_gpu_bin_threads((uint32_t)args->ne0, pipeline);
    id<MTLComputeCommandEncoder> enc = ds4_gpu_compute_encoder(cb);
    [enc setComputePipelineState:pipeline];
    [enc setBytes:args length:sizeof(*args) atIndex:0];
    [enc setBuffer:a offset:a_off atIndex:1];
    [enc setBuffer:b offset:b_off atIndex:2];
    [enc setBuffer:out offset:out_off atIndex:3];
    [enc dispatchThreadgroups:MTLSizeMake((NSUInteger)args->ne1,
                                          (NSUInteger)args->ne2,
                                          (NSUInteger)args->ne3)
         threadsPerThreadgroup:MTLSizeMake(nth, 1, 1)];
    ds4_gpu_end_compute_encoder(cb, enc);
    return 1;
}

static ds4_gpu_bin_args ds4_gpu_make_bin_rowwise_scalar_args(uint32_t width, uint32_t rows) {
    const uint64_t lhs_row_bytes = (uint64_t)width * sizeof(float);
    const uint64_t rhs_row_bytes = sizeof(float);
    return (ds4_gpu_bin_args) {
        .ne00 = (int32_t)width,
        .ne01 = (int32_t)rows,
        .ne02 = 1,
        .ne03 = 1,
        .nb00 = sizeof(float),
        .nb01 = lhs_row_bytes,
        .nb02 = (uint64_t)rows * lhs_row_bytes,
        .nb03 = (uint64_t)rows * lhs_row_bytes,
        .ne10 = 1,
        .ne11 = (int32_t)rows,
        .ne12 = 1,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_metal.m

```c
.nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
        .ne2 = 1,
        .ne3 = 1,
        .nb0 = sizeof(float),
        .nb1 = lhs_row_bytes,
        .nb2 = (uint64_t)rows * lhs_row_bytes,
        .nb3 = (uint64_t)rows * lhs_row_bytes,
        .offs = 0,
        .o1 = { 0 },
    };
}

static ds4_gpu_mul_mv_id_args ds4_gpu_make_mul_mv_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t nr0) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    const uint64_t src0_blocks = src0_cols / 256u;
    const uint64_t src0_block_bytes = src0_blocks ? src0_row_bytes / src0_blocks : 1u;
    return (ds4_gpu_mul_mv_id_args) {
        .nei0 = (int32_t)selected_experts,
        .nei1 = (int32_t)n_tokens,
        .nbi1 = (uint64_t)selected_experts * sizeof(int32_t),
        .ne00 = (int32_t)src0_cols,
        .ne01 = (int32_t)src0_rows,
        .ne02 = (int32_t)src0_experts,
        .nb00 = src0_block_bytes,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .ne12 = (int32_t)n_tokens,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .nb1 = (uint64_t)src0_rows * sizeof(float),
        .nr0 = (int32_t)nr0,
    };
}

static ds4_gpu_mul_mm_id_map_args ds4_gpu_make_mul_mm_id_map_args(
        uint32_t src0_cols,
        uint32_t src0_experts,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    return (ds4_gpu_mul_mm_id_map_args) {
        .ne02 = (int32_t)src0_experts,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne21 = (int32_t)n_tokens,
        .ne20 = (int32_t)selected_experts,
        .nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_metal.m

```c
.nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
        .ne2 = 1,
        .ne3 = 1,
        .nb0 = sizeof(float),
        .nb1 = lhs_row_bytes,
        .nb2 = (uint64_t)rows * lhs_row_bytes,
        .nb3 = (uint64_t)rows * lhs_row_bytes,
        .offs = 0,
        .o1 = { 0 },
    };
}

static ds4_gpu_mul_mv_id_args ds4_gpu_make_mul_mv_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t nr0) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    const uint64_t src0_blocks = src0_cols / 256u;
    const uint64_t src0_block_bytes = src0_blocks ? src0_row_bytes / src0_blocks : 1u;
    return (ds4_gpu_mul_mv_id_args) {
        .nei0 = (int32_t)selected_experts,
        .nei1 = (int32_t)n_tokens,
        .nbi1 = (uint64_t)selected_experts * sizeof(int32_t),
        .ne00 = (int32_t)src0_cols,
        .ne01 = (int32_t)src0_rows,
        .ne02 = (int32_t)src0_experts,
        .nb00 = src0_block_bytes,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .ne12 = (int32_t)n_tokens,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .nb1 = (uint64_t)src0_rows * sizeof(float),
        .nr0 = (int32_t)nr0,
    };
}

static ds4_gpu_mul_mm_id_map_args ds4_gpu_make_mul_mm_id_map_args(
        uint32_t src0_cols,
        uint32_t src0_experts,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    return (ds4_gpu_mul_mm_id_map_args) {
        .ne02 = (int32_t)src0_experts,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne21 = (int32_t)n_tokens,
        .ne20 = (int32_t)selected_experts,
        .nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_metal.m

```c
.nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
        .ne2 = 1,
        .ne3 = 1,
        .nb0 = sizeof(float),
        .nb1 = lhs_row_bytes,
        .nb2 = (uint64_t)rows * lhs_row_bytes,
        .nb3 = (uint64_t)rows * lhs_row_bytes,
        .offs = 0,
        .o1 = { 0 },
    };
}

static ds4_gpu_mul_mv_id_args ds4_gpu_make_mul_mv_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t nr0) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    const uint64_t src0_blocks = src0_cols / 256u;
    const uint64_t src0_block_bytes = src0_blocks ? src0_row_bytes / src0_blocks : 1u;
    return (ds4_gpu_mul_mv_id_args) {
        .nei0 = (int32_t)selected_experts,
        .nei1 = (int32_t)n_tokens,
        .nbi1 = (uint64_t)selected_experts * sizeof(int32_t),
        .ne00 = (int32_t)src0_cols,
        .ne01 = (int32_t)src0_rows,
        .ne02 = (int32_t)src0_experts,
        .nb00 = src0_block_bytes,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .ne12 = (int32_t)n_tokens,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .nb1 = (uint64_t)src0_rows * sizeof(float),
        .nr0 = (int32_t)nr0,
    };
}

static ds4_gpu_mul_mm_id_map_args ds4_gpu_make_mul_mm_id_map_args(
        uint32_t src0_cols,
        uint32_t src0_experts,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    return (ds4_gpu_mul_mm_id_map_args) {
        .ne02 = (int32_t)src0_experts,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne21 = (int32_t)n_tokens,
        .ne20 = (int32_t)selected_experts,
        .nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Suggest a minimal correctness-preserving optimization for this excerpt.

File: ds4_metal.m

```c
.nb11 = rhs_row_bytes,
        .nb12 = (uint64_t)rows * rhs_row_bytes,
        .nb13 = (uint64_t)rows * rhs_row_bytes,
        .ne0 = (int32_t)width,
        .ne1 = (int32_t)rows,
        .ne2 = 1,
        .ne3 = 1,
        .nb0 = sizeof(float),
        .nb1 = lhs_row_bytes,
        .nb2 = (uint64_t)rows * lhs_row_bytes,
        .nb3 = (uint64_t)rows * lhs_row_bytes,
        .offs = 0,
        .o1 = { 0 },
    };
}

static ds4_gpu_mul_mv_id_args ds4_gpu_make_mul_mv_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t nr0) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    const uint64_t src0_blocks = src0_cols / 256u;
    const uint64_t src0_block_bytes = src0_blocks ? src0_row_bytes / src0_blocks : 1u;
    return (ds4_gpu_mul_mv_id_args) {
        .nei0 = (int32_t)selected_experts,
        .nei1 = (int32_t)n_tokens,
        .nbi1 = (uint64_t)selected_experts * sizeof(int32_t),
        .ne00 = (int32_t)src0_cols,
        .ne01 = (int32_t)src0_rows,
        .ne02 = (int32_t)src0_experts,
        .nb00 = src0_block_bytes,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .ne12 = (int32_t)n_tokens,
        .ne13 = 1,
        .nb10 = sizeof(float),
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .nb1 = (uint64_t)src0_rows * sizeof(float),
        .nr0 = (int32_t)nr0,
    };
}

static ds4_gpu_mul_mm_id_map_args ds4_gpu_make_mul_mm_id_map_args(
        uint32_t src0_cols,
        uint32_t src0_experts,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * sizeof(float);
    return (ds4_gpu_mul_mm_id_map_args) {
        .ne02 = (int32_t)src0_experts,
        .ne10 = (int32_t)src0_cols,
        .ne11 = (int32_t)src1_expert_rows,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne21 = (int32_t)n_tokens,
        .ne20 = (int32_t)selected_experts,
        .nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
.nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    return ds4_gpu_make_mul_mm_id_args_src1_size(src0_cols,
                                                   src0_rows,
                                                   src0_experts,
                                                   src0_row_bytes,
                                                   src0_expert_bytes,
                                                   src1_expert_rows,
                                                   selected_experts,
                                                   n_tokens,
                                                   sizeof(float));
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args_src1_size(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t src1_elem_size) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * src1_elem_size;
    return (ds4_gpu_mul_mm_id_args) {
        .ne00 = (int32_t)src0_cols,
        .ne02 = (int32_t)src0_experts,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .nb03 = (uint64_t)src0_experts * src0_expert_bytes,
        .ne11 = (int32_t)src1_expert_rows,
        .nb10 = src1_elem_size,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .nb13 = (uint64_t)n_tokens * (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne20 = (int32_t)selected_experts,
        .ne21 = (int32_t)n_tokens,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .r2 = 1,
        .r3 = 1,
    };
}

static uint32_t ds4_gpu_routed_mv_nr0(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_Q4_K:    return 2;
    case DS4_METAL_TENSOR_Q2_K:
    case DS4_METAL_TENSOR_IQ2_XXS: return 4;
    default:                       return 0;
    }
}

static NSUInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
.nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    return ds4_gpu_make_mul_mm_id_args_src1_size(src0_cols,
                                                   src0_rows,
                                                   src0_experts,
                                                   src0_row_bytes,
                                                   src0_expert_bytes,
                                                   src1_expert_rows,
                                                   selected_experts,
                                                   n_tokens,
                                                   sizeof(float));
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args_src1_size(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t src1_elem_size) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * src1_elem_size;
    return (ds4_gpu_mul_mm_id_args) {
        .ne00 = (int32_t)src0_cols,
        .ne02 = (int32_t)src0_experts,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .nb03 = (uint64_t)src0_experts * src0_expert_bytes,
        .ne11 = (int32_t)src1_expert_rows,
        .nb10 = src1_elem_size,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .nb13 = (uint64_t)n_tokens * (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne20 = (int32_t)selected_experts,
        .ne21 = (int32_t)n_tokens,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .r2 = 1,
        .r3 = 1,
    };
}

static uint32_t ds4_gpu_routed_mv_nr0(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_Q4_K:    return 2;
    case DS4_METAL_TENSOR_Q2_K:
    case DS4_METAL_TENSOR_IQ2_XXS: return 4;
    default:                       return 0;
    }
}

static NSUInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
.nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    return ds4_gpu_make_mul_mm_id_args_src1_size(src0_cols,
                                                   src0_rows,
                                                   src0_experts,
                                                   src0_row_bytes,
                                                   src0_expert_bytes,
                                                   src1_expert_rows,
                                                   selected_experts,
                                                   n_tokens,
                                                   sizeof(float));
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args_src1_size(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t src1_elem_size) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * src1_elem_size;
    return (ds4_gpu_mul_mm_id_args) {
        .ne00 = (int32_t)src0_cols,
        .ne02 = (int32_t)src0_experts,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .nb03 = (uint64_t)src0_experts * src0_expert_bytes,
        .ne11 = (int32_t)src1_expert_rows,
        .nb10 = src1_elem_size,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .nb13 = (uint64_t)n_tokens * (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne20 = (int32_t)selected_experts,
        .ne21 = (int32_t)n_tokens,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .r2 = 1,
        .r3 = 1,
    };
}

static uint32_t ds4_gpu_routed_mv_nr0(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_Q4_K:    return 2;
    case DS4_METAL_TENSOR_Q2_K:
    case DS4_METAL_TENSOR_IQ2_XXS: return 4;
    default:                       return 0;
    }
}

static NSUInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4_metal.m

```c
.nb21 = (uint64_t)selected_experts * sizeof(int32_t),
    };
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens) {
    return ds4_gpu_make_mul_mm_id_args_src1_size(src0_cols,
                                                   src0_rows,
                                                   src0_experts,
                                                   src0_row_bytes,
                                                   src0_expert_bytes,
                                                   src1_expert_rows,
                                                   selected_experts,
                                                   n_tokens,
                                                   sizeof(float));
}

static ds4_gpu_mul_mm_id_args ds4_gpu_make_mul_mm_id_args_src1_size(
        uint32_t src0_cols,
        uint32_t src0_rows,
        uint32_t src0_experts,
        uint64_t src0_row_bytes,
        uint64_t src0_expert_bytes,
        uint32_t src1_expert_rows,
        uint32_t selected_experts,
        uint32_t n_tokens,
        uint32_t src1_elem_size) {
    const uint64_t src1_row_bytes = (uint64_t)src0_cols * src1_elem_size;
    return (ds4_gpu_mul_mm_id_args) {
        .ne00 = (int32_t)src0_cols,
        .ne02 = (int32_t)src0_experts,
        .nb01 = src0_row_bytes,
        .nb02 = src0_expert_bytes,
        .nb03 = (uint64_t)src0_experts * src0_expert_bytes,
        .ne11 = (int32_t)src1_expert_rows,
        .nb10 = src1_elem_size,
        .nb11 = src1_row_bytes,
        .nb12 = (uint64_t)src1_expert_rows * src1_row_bytes,
        .nb13 = (uint64_t)n_tokens * (uint64_t)src1_expert_rows * src1_row_bytes,
        .ne20 = (int32_t)selected_experts,
        .ne21 = (int32_t)n_tokens,
        .ne0 = (int32_t)src0_rows,
        .ne1 = (int32_t)selected_experts,
        .r2 = 1,
        .r3 = 1,
    };
}

static uint32_t ds4_gpu_routed_mv_nr0(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_Q4_K:    return 2;
    case DS4_METAL_TENSOR_Q2_K:
    case DS4_METAL_TENSOR_IQ2_XXS: return 4;
    default:                       return 0;
    }
}

static NSUInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}
```<｜Assistant｜><think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
UInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}

static id<MTLComputePipelineState> ds4_gpu_routed_mv_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS: return g_moe_mul_mv_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:    return g_moe_mul_mv_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:    return g_moe_mul_mv_id_q4_k_pipeline;
    default:                       return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        if (!g_moe_mul_mm_id_iq2_xxs_pipeline) {
            g_moe_mul_mm_id_iq2_xxs_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f32", false);
        }
        return g_moe_mul_mm_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:
        if (!g_moe_mul_mm_id_q2_k_pipeline) {
            g_moe_mul_mm_id_q2_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f32", false);
        }
        return g_moe_mul_mm_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:
        if (!g_moe_mul_mm_id_q4_k_pipeline) {
            g_moe_mul_mm_id_q4_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f32", false);
        }
        return g_moe_mul_mm_id_q4_k_pipeline;
    default:
        return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_f16_rhs_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f16", false);
    case DS4_METAL_TENSOR_Q2_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f16", false);
    case DS4_METAL_TENSOR_Q4_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f16", false);
    default:
        return nil;
    }
}

static int ds4_gpu_encode_mul_mv_id(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_mul_mv_id_args *args,
        id<MTLBuffer>               src0,
        NSUInteger                  src0_off,
        id<MTLBuffer>               src1,
        NSUInteger                  src1_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        id<MTLBuffer>               ids,
        NSUInteger                  ids_off,
        NSUInteger                  threadgroup_bytes,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
UInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}

static id<MTLComputePipelineState> ds4_gpu_routed_mv_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS: return g_moe_mul_mv_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:    return g_moe_mul_mv_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:    return g_moe_mul_mv_id_q4_k_pipeline;
    default:                       return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        if (!g_moe_mul_mm_id_iq2_xxs_pipeline) {
            g_moe_mul_mm_id_iq2_xxs_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f32", false);
        }
        return g_moe_mul_mm_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:
        if (!g_moe_mul_mm_id_q2_k_pipeline) {
            g_moe_mul_mm_id_q2_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f32", false);
        }
        return g_moe_mul_mm_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:
        if (!g_moe_mul_mm_id_q4_k_pipeline) {
            g_moe_mul_mm_id_q4_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f32", false);
        }
        return g_moe_mul_mm_id_q4_k_pipeline;
    default:
        return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_f16_rhs_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f16", false);
    case DS4_METAL_TENSOR_Q2_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f16", false);
    case DS4_METAL_TENSOR_Q4_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f16", false);
    default:
        return nil;
    }
}

static int ds4_gpu_encode_mul_mv_id(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_mul_mv_id_args *args,
        id<MTLBuffer>               src0,
        NSUInteger                  src0_off,
        id<MTLBuffer>               src1,
        NSUInteger                  src1_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        id<MTLBuffer>               ids,
        NSUInteger                  ids_off,
        NSUInteger                  threadgroup_bytes,
```<｜Assistant｜></think>


[System] You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.

[User]
Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
UInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}

static id<MTLComputePipelineState> ds4_gpu_routed_mv_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS: return g_moe_mul_mv_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:    return g_moe_mul_mv_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:    return g_moe_mul_mv_id_q4_k_pipeline;
    default:                       return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        if (!g_moe_mul_mm_id_iq2_xxs_pipeline) {
            g_moe_mul_mm_id_iq2_xxs_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f32", false);
        }
        return g_moe_mul_mm_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:
        if (!g_moe_mul_mm_id_q2_k_pipeline) {
            g_moe_mul_mm_id_q2_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f32", false);
        }
        return g_moe_mul_mm_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:
        if (!g_moe_mul_mm_id_q4_k_pipeline) {
            g_moe_mul_mm_id_q4_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f32", false);
        }
        return g_moe_mul_mm_id_q4_k_pipeline;
    default:
        return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_f16_rhs_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f16", false);
    case DS4_METAL_TENSOR_Q2_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f16", false);
    case DS4_METAL_TENSOR_Q4_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f16", false);
    default:
        return nil;
    }
}

static int ds4_gpu_encode_mul_mv_id(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_mul_mv_id_args *args,
        id<MTLBuffer>               src0,
        NSUInteger                  src0_off,
        id<MTLBuffer>               src1,
        NSUInteger                  src1_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        id<MTLBuffer>               ids,
        NSUInteger                  ids_off,
        NSUInteger                  threadgroup_bytes,
```

<｜begin▁of▁sentence｜>You are DeepSeek V4 Flash running locally. Answer accurately, preserve technical details, and use tools only when the prompt asks for tool use.<｜User｜>Review this excerpt for correctness risks, memory lifetime issues, and performance bottlenecks.

File: ds4_metal.m

```c
UInteger ds4_gpu_routed_mv_smem(uint32_t type) {
    if (type == DS4_METAL_TENSOR_IQ2_XXS) {
        return 256u * sizeof(uint64_t) + 128u * sizeof(uint8_t);
    }
    return 0;
}

static id<MTLComputePipelineState> ds4_gpu_routed_mv_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS: return g_moe_mul_mv_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:    return g_moe_mul_mv_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:    return g_moe_mul_mv_id_q4_k_pipeline;
    default:                       return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        if (!g_moe_mul_mm_id_iq2_xxs_pipeline) {
            g_moe_mul_mm_id_iq2_xxs_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f32", false);
        }
        return g_moe_mul_mm_id_iq2_xxs_pipeline;
    case DS4_METAL_TENSOR_Q2_K:
        if (!g_moe_mul_mm_id_q2_k_pipeline) {
            g_moe_mul_mm_id_q2_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f32", false);
        }
        return g_moe_mul_mm_id_q2_k_pipeline;
    case DS4_METAL_TENSOR_Q4_K:
        if (!g_moe_mul_mm_id_q4_k_pipeline) {
            g_moe_mul_mm_id_q4_k_pipeline =
                ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f32", false);
        }
        return g_moe_mul_mm_id_q4_k_pipeline;
    default:
        return nil;
    }
}

static id<MTLComputePipelineState> ds4_gpu_routed_mm_f16_rhs_pipeline(uint32_t type) {
    switch (type) {
    case DS4_METAL_TENSOR_IQ2_XXS:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_iq2_xxs_f16", false);
    case DS4_METAL_TENSOR_Q2_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q2_K_f16", false);
    case DS4_METAL_TENSOR_Q4_K:
        return ds4_gpu_get_mul_mm_id_pipeline("kernel_mul_mm_id_q4_K_f16", false);
    default:
        return nil;
    }
}

static int ds4_gpu_encode_mul_mv_id(
        id<MTLCommandBuffer>        cb,
        id<MTLComputePipelineState> pipeline,
        const ds4_gpu_mul_mv_id_args *args,
        id<MTLBuffer>               src0,
        NSUInteger                  src0_off,
        id<MTLBuffer>               src1,
        NSUInteger                  src1_off,
        id<MTLBuffer>               dst,
        NSUInteger                  dst_off,
        id<MTLBuffer>               ids,
        NSUInteger                  ids_off,
        NSUInteger                  threadgroup_bytes,
```<｜Assistant｜><think>