[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.c

```c
norm->abs_offset,
                                                        layer->attn_compressor_norm->type,
                                                        DS4_N_HEAD_DIM,
                                                        ratio,
                                                        pos,
                                                        comp_row,
                                                        DS4_N_ROT,
                                                        compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                        freq_base,
                                                        freq_scale,
                                                        ext_factor,
                                                        attn_factor,
                                                        DS4_ROPE_YARN_BETA_FAST,
                                                        DS4_ROPE_YARN_BETA_SLOW,
                                                        DS4_RMS_EPS) != 0;
        if (ok && emit) {
            ds4_gpu_tensor *comp_row_view = ds4_gpu_tensor_view(
                    g->layer_attn_comp_cache[il],
                    (uint64_t)comp_row * DS4_N_HEAD_DIM * sizeof(float),
                    (uint64_t)DS4_N_HEAD_DIM * sizeof(float));
            if (!comp_row_view) {
                ok = false;
            } else {
                ok = ds4_gpu_dsv4_fp8_kv_quantize_tensor(comp_row_view, 1, DS4_N_HEAD_DIM, DS4_N_ROT) != 0;
                if (ok) {
                    metal_graph_debug_dump_tensor("KVcompress", comp_row_view, DS4_N_HEAD_DIM, il, pos);
                }
                ds4_gpu_tensor_free(comp_row_view);
            }
        }
        if (ok && emit) g->layer_n_comp[il]++;

        if (ok && ratio == 4) {
            const uint32_t index_width = coff * DS4_N_INDEXER_HEAD_DIM;
            if (!layer->indexer_compressor_kv || !layer->indexer_compressor_gate ||
                !layer->indexer_compressor_ape || !layer->indexer_compressor_norm ||
                layer->indexer_compressor_kv->type != DS4_TENSOR_F16 ||
                layer->indexer_compressor_gate->type != DS4_TENSOR_F16 ||
                layer->indexer_compressor_kv->dim[0] != DS4_N_EMBD ||
                layer->indexer_compressor_gate->dim[0] != DS4_N_EMBD ||
                layer->indexer_compressor_kv->dim[1] != index_width ||
                layer->indexer_compressor_gate->dim[1] != index_width) {
                fprintf(stderr, "ds4: Metal graph indexer compressor expects paired F16 projections\n");
```

<｜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.c

```c
norm->abs_offset,
                                                        layer->attn_compressor_norm->type,
                                                        DS4_N_HEAD_DIM,
                                                        ratio,
                                                        pos,
                                                        comp_row,
                                                        DS4_N_ROT,
                                                        compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                        freq_base,
                                                        freq_scale,
                                                        ext_factor,
                                                        attn_factor,
                                                        DS4_ROPE_YARN_BETA_FAST,
                                                        DS4_ROPE_YARN_BETA_SLOW,
                                                        DS4_RMS_EPS) != 0;
        if (ok && emit) {
            ds4_gpu_tensor *comp_row_view = ds4_gpu_tensor_view(
                    g->layer_attn_comp_cache[il],
                    (uint64_t)comp_row * DS4_N_HEAD_DIM * sizeof(float),
                    (uint64_t)DS4_N_HEAD_DIM * sizeof(float));
            if (!comp_row_view) {
                ok = false;
            } else {
                ok = ds4_gpu_dsv4_fp8_kv_quantize_tensor(comp_row_view, 1, DS4_N_HEAD_DIM, DS4_N_ROT) != 0;
                if (ok) {
                    metal_graph_debug_dump_tensor("KVcompress", comp_row_view, DS4_N_HEAD_DIM, il, pos);
                }
                ds4_gpu_tensor_free(comp_row_view);
            }
        }
        if (ok && emit) g->layer_n_comp[il]++;

        if (ok && ratio == 4) {
            const uint32_t index_width = coff * DS4_N_INDEXER_HEAD_DIM;
            if (!layer->indexer_compressor_kv || !layer->indexer_compressor_gate ||
                !layer->indexer_compressor_ape || !layer->indexer_compressor_norm ||
                layer->indexer_compressor_kv->type != DS4_TENSOR_F16 ||
                layer->indexer_compressor_gate->type != DS4_TENSOR_F16 ||
                layer->indexer_compressor_kv->dim[0] != DS4_N_EMBD ||
                layer->indexer_compressor_gate->dim[0] != DS4_N_EMBD ||
                layer->indexer_compressor_kv->dim[1] != index_width ||
                layer->indexer_compressor_gate->dim[1] != index_width) {
                fprintf(stderr, "ds4: Metal graph indexer compressor expects paired F16 projections\n");
```<｜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.c

```c
r_u32(&tmp, &alignment) && alignment != 0) {
                m->alignment = alignment;
            }
        }

        if (!skip_value(c, kv->type, 0)) ds4_die(c->error);
    }
}

/* Read the tensor directory and convert relative GGUF offsets to absolute
 * mmap offsets.  Tensor bytes are still never copied here. */
static void parse_tensors(ds4_model *m, ds4_cursor *c) {
    m->tensors = calloc((size_t)m->n_tensors, sizeof(m->tensors[0]));
    if (!m->tensors) ds4_die("out of memory while allocating tensor table");

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];

        if (!cursor_string(c, &t->name)) ds4_die(c->error);
        if (!cursor_u32(c, &t->ndim)) ds4_die(c->error);
        if (t->ndim == 0 || t->ndim > DS4_MAX_DIMS) {
            ds4_die("tensor has an unsupported number of dimensions");
        }

        t->elements = 1;
        for (uint32_t d = 0; d < t->ndim; d++) {
            if (!cursor_u64(c, &t->dim[d])) ds4_die(c->error);
            if (t->dim[d] != 0 && t->elements > UINT64_MAX / t->dim[d]) {
                ds4_die("tensor element count overflow");
            }
            t->elements *= t->dim[d];
        }

        if (!cursor_u32(c, &t->type)) ds4_die(c->error);
        if (!cursor_u64(c, &t->rel_offset)) ds4_die(c->error);

        if (!tensor_nbytes(t->type, t->elements, &t->bytes)) {
            ds4_log(stderr,
                DS4_LOG_WARNING,
                "ds4: warning: tensor %.*s has unsupported GGUF type %u\n",
                (int)t->name.len, t->name.ptr, t->type);
        }
    }

    m->tensor_data_pos = align_up(c->pos, m->alignment);

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];
        if (t->rel_offset > UINT64_MAX - m->tensor_data_pos) {
            ds4_die("tensor offset overflow");
        }
        t->abs_offset = m->tensor_data_pos + t->rel_offset;
        if (t->bytes != 0 &&
            (t->abs_offset > m->size || t->bytes > m->size - t->abs_offset))
        {
            ds4_die("tensor points outside GGUF file");
        }
    }
}

/* Open and map the GGUF once.  Metal needs a shared mapping for no-copy
 * MTLBuffers; CPU uses a private read-only mapping to avoid Darwin VM stress.
 * Tokenizer-only callers pass prefetch_cpu=false so inspecting tokens never
 * walks the huge tensor payload. */
static void model_open(ds4_model *m, const char *path, bool metal_mapping,
                       bool prefetch_cpu) {
    memset(m, 0, sizeof(*m));
    m->fd = -1;

    int fd = open(path, O_RDONLY);
```

<｜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.c

```c
r_u32(&tmp, &alignment) && alignment != 0) {
                m->alignment = alignment;
            }
        }

        if (!skip_value(c, kv->type, 0)) ds4_die(c->error);
    }
}

/* Read the tensor directory and convert relative GGUF offsets to absolute
 * mmap offsets.  Tensor bytes are still never copied here. */
static void parse_tensors(ds4_model *m, ds4_cursor *c) {
    m->tensors = calloc((size_t)m->n_tensors, sizeof(m->tensors[0]));
    if (!m->tensors) ds4_die("out of memory while allocating tensor table");

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];

        if (!cursor_string(c, &t->name)) ds4_die(c->error);
        if (!cursor_u32(c, &t->ndim)) ds4_die(c->error);
        if (t->ndim == 0 || t->ndim > DS4_MAX_DIMS) {
            ds4_die("tensor has an unsupported number of dimensions");
        }

        t->elements = 1;
        for (uint32_t d = 0; d < t->ndim; d++) {
            if (!cursor_u64(c, &t->dim[d])) ds4_die(c->error);
            if (t->dim[d] != 0 && t->elements > UINT64_MAX / t->dim[d]) {
                ds4_die("tensor element count overflow");
            }
            t->elements *= t->dim[d];
        }

        if (!cursor_u32(c, &t->type)) ds4_die(c->error);
        if (!cursor_u64(c, &t->rel_offset)) ds4_die(c->error);

        if (!tensor_nbytes(t->type, t->elements, &t->bytes)) {
            ds4_log(stderr,
                DS4_LOG_WARNING,
                "ds4: warning: tensor %.*s has unsupported GGUF type %u\n",
                (int)t->name.len, t->name.ptr, t->type);
        }
    }

    m->tensor_data_pos = align_up(c->pos, m->alignment);

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];
        if (t->rel_offset > UINT64_MAX - m->tensor_data_pos) {
            ds4_die("tensor offset overflow");
        }
        t->abs_offset = m->tensor_data_pos + t->rel_offset;
        if (t->bytes != 0 &&
            (t->abs_offset > m->size || t->bytes > m->size - t->abs_offset))
        {
            ds4_die("tensor points outside GGUF file");
        }
    }
}

/* Open and map the GGUF once.  Metal needs a shared mapping for no-copy
 * MTLBuffers; CPU uses a private read-only mapping to avoid Darwin VM stress.
 * Tokenizer-only callers pass prefetch_cpu=false so inspecting tokens never
 * walks the huge tensor payload. */
static void model_open(ds4_model *m, const char *path, bool metal_mapping,
                       bool prefetch_cpu) {
    memset(m, 0, sizeof(*m));
    m->fd = -1;

    int fd = open(path, O_RDONLY);
```<｜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.c

```c
r_u32(&tmp, &alignment) && alignment != 0) {
                m->alignment = alignment;
            }
        }

        if (!skip_value(c, kv->type, 0)) ds4_die(c->error);
    }
}

/* Read the tensor directory and convert relative GGUF offsets to absolute
 * mmap offsets.  Tensor bytes are still never copied here. */
static void parse_tensors(ds4_model *m, ds4_cursor *c) {
    m->tensors = calloc((size_t)m->n_tensors, sizeof(m->tensors[0]));
    if (!m->tensors) ds4_die("out of memory while allocating tensor table");

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];

        if (!cursor_string(c, &t->name)) ds4_die(c->error);
        if (!cursor_u32(c, &t->ndim)) ds4_die(c->error);
        if (t->ndim == 0 || t->ndim > DS4_MAX_DIMS) {
            ds4_die("tensor has an unsupported number of dimensions");
        }

        t->elements = 1;
        for (uint32_t d = 0; d < t->ndim; d++) {
            if (!cursor_u64(c, &t->dim[d])) ds4_die(c->error);
            if (t->dim[d] != 0 && t->elements > UINT64_MAX / t->dim[d]) {
                ds4_die("tensor element count overflow");
            }
            t->elements *= t->dim[d];
        }

        if (!cursor_u32(c, &t->type)) ds4_die(c->error);
        if (!cursor_u64(c, &t->rel_offset)) ds4_die(c->error);

        if (!tensor_nbytes(t->type, t->elements, &t->bytes)) {
            ds4_log(stderr,
                DS4_LOG_WARNING,
                "ds4: warning: tensor %.*s has unsupported GGUF type %u\n",
                (int)t->name.len, t->name.ptr, t->type);
        }
    }

    m->tensor_data_pos = align_up(c->pos, m->alignment);

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];
        if (t->rel_offset > UINT64_MAX - m->tensor_data_pos) {
            ds4_die("tensor offset overflow");
        }
        t->abs_offset = m->tensor_data_pos + t->rel_offset;
        if (t->bytes != 0 &&
            (t->abs_offset > m->size || t->bytes > m->size - t->abs_offset))
        {
            ds4_die("tensor points outside GGUF file");
        }
    }
}

/* Open and map the GGUF once.  Metal needs a shared mapping for no-copy
 * MTLBuffers; CPU uses a private read-only mapping to avoid Darwin VM stress.
 * Tokenizer-only callers pass prefetch_cpu=false so inspecting tokens never
 * walks the huge tensor payload. */
static void model_open(ds4_model *m, const char *path, bool metal_mapping,
                       bool prefetch_cpu) {
    memset(m, 0, sizeof(*m));
    m->fd = -1;

    int fd = open(path, O_RDONLY);
```

<｜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.c

```c
r_u32(&tmp, &alignment) && alignment != 0) {
                m->alignment = alignment;
            }
        }

        if (!skip_value(c, kv->type, 0)) ds4_die(c->error);
    }
}

/* Read the tensor directory and convert relative GGUF offsets to absolute
 * mmap offsets.  Tensor bytes are still never copied here. */
static void parse_tensors(ds4_model *m, ds4_cursor *c) {
    m->tensors = calloc((size_t)m->n_tensors, sizeof(m->tensors[0]));
    if (!m->tensors) ds4_die("out of memory while allocating tensor table");

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];

        if (!cursor_string(c, &t->name)) ds4_die(c->error);
        if (!cursor_u32(c, &t->ndim)) ds4_die(c->error);
        if (t->ndim == 0 || t->ndim > DS4_MAX_DIMS) {
            ds4_die("tensor has an unsupported number of dimensions");
        }

        t->elements = 1;
        for (uint32_t d = 0; d < t->ndim; d++) {
            if (!cursor_u64(c, &t->dim[d])) ds4_die(c->error);
            if (t->dim[d] != 0 && t->elements > UINT64_MAX / t->dim[d]) {
                ds4_die("tensor element count overflow");
            }
            t->elements *= t->dim[d];
        }

        if (!cursor_u32(c, &t->type)) ds4_die(c->error);
        if (!cursor_u64(c, &t->rel_offset)) ds4_die(c->error);

        if (!tensor_nbytes(t->type, t->elements, &t->bytes)) {
            ds4_log(stderr,
                DS4_LOG_WARNING,
                "ds4: warning: tensor %.*s has unsupported GGUF type %u\n",
                (int)t->name.len, t->name.ptr, t->type);
        }
    }

    m->tensor_data_pos = align_up(c->pos, m->alignment);

    for (uint64_t i = 0; i < m->n_tensors; i++) {
        ds4_tensor *t = &m->tensors[i];
        if (t->rel_offset > UINT64_MAX - m->tensor_data_pos) {
            ds4_die("tensor offset overflow");
        }
        t->abs_offset = m->tensor_data_pos + t->rel_offset;
        if (t->bytes != 0 &&
            (t->abs_offset > m->size || t->bytes > m->size - t->abs_offset))
        {
            ds4_die("tensor points outside GGUF file");
        }
    }
}

/* Open and map the GGUF once.  Metal needs a shared mapping for no-copy
 * MTLBuffers; CPU uses a private read-only mapping to avoid Darwin VM stress.
 * Tokenizer-only callers pass prefetch_cpu=false so inspecting tokens never
 * walks the huge tensor payload. */
static void model_open(ds4_model *m, const char *path, bool metal_mapping,
                       bool prefetch_cpu) {
    memset(m, 0, sizeof(*m));
    m->fd = -1;

    int fd = open(path, O_RDONLY);
```<｜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.c

```c
||
                layer->indexer_compressor_gate->dim[1] != index_width) {
                fprintf(stderr, "ds4: Metal graph indexer compressor expects paired F16 projections\n");
                ok = false;
            }
            if (ok && emit && g->layer_n_index_comp[il] >= g->layer_comp_cap[il]) {
                fprintf(stderr, "ds4: Metal graph indexer compressed KV cache capacity exceeded at layer %u\n", il);
                ok = false;
            }
            if (ok && !metal_graph_use_reference_compressor_pair_proj()) {
                ok = ds4_gpu_matmul_f16_pair_tensor(g->comp_kv_cur,
                                                      g->comp_sc_cur,
                                                      model->map,
                                                      model->size,
                                                      layer->indexer_compressor_kv->abs_offset,
                                                      layer->indexer_compressor_gate->abs_offset,
                                                      DS4_N_EMBD,
                                                      index_width,
                                                      g->attn_norm,
                                                      1) != 0;
            } else {
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_kv_cur, model->map, model->size,
                                                         layer->indexer_compressor_kv->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_sc_cur, model->map, model->size,
                                                         layer->indexer_compressor_gate->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
            }
            const uint32_t index_row = g->layer_n_index_comp[il];
            if (ok) ok = ds4_gpu_compressor_update_tensor(g->comp_kv_cur,
                                                            g->comp_sc_cur,
                                                            g->layer_index_state_kv[il],
                                                            g->layer_index_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
```

<｜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.c

```c
||
                layer->indexer_compressor_gate->dim[1] != index_width) {
                fprintf(stderr, "ds4: Metal graph indexer compressor expects paired F16 projections\n");
                ok = false;
            }
            if (ok && emit && g->layer_n_index_comp[il] >= g->layer_comp_cap[il]) {
                fprintf(stderr, "ds4: Metal graph indexer compressed KV cache capacity exceeded at layer %u\n", il);
                ok = false;
            }
            if (ok && !metal_graph_use_reference_compressor_pair_proj()) {
                ok = ds4_gpu_matmul_f16_pair_tensor(g->comp_kv_cur,
                                                      g->comp_sc_cur,
                                                      model->map,
                                                      model->size,
                                                      layer->indexer_compressor_kv->abs_offset,
                                                      layer->indexer_compressor_gate->abs_offset,
                                                      DS4_N_EMBD,
                                                      index_width,
                                                      g->attn_norm,
                                                      1) != 0;
            } else {
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_kv_cur, model->map, model->size,
                                                         layer->indexer_compressor_kv->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_sc_cur, model->map, model->size,
                                                         layer->indexer_compressor_gate->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
            }
            const uint32_t index_row = g->layer_n_index_comp[il];
            if (ok) ok = ds4_gpu_compressor_update_tensor(g->comp_kv_cur,
                                                            g->comp_sc_cur,
                                                            g->layer_index_state_kv[il],
                                                            g->layer_index_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
```<｜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.c

```c
||
                layer->indexer_compressor_gate->dim[1] != index_width) {
                fprintf(stderr, "ds4: Metal graph indexer compressor expects paired F16 projections\n");
                ok = false;
            }
            if (ok && emit && g->layer_n_index_comp[il] >= g->layer_comp_cap[il]) {
                fprintf(stderr, "ds4: Metal graph indexer compressed KV cache capacity exceeded at layer %u\n", il);
                ok = false;
            }
            if (ok && !metal_graph_use_reference_compressor_pair_proj()) {
                ok = ds4_gpu_matmul_f16_pair_tensor(g->comp_kv_cur,
                                                      g->comp_sc_cur,
                                                      model->map,
                                                      model->size,
                                                      layer->indexer_compressor_kv->abs_offset,
                                                      layer->indexer_compressor_gate->abs_offset,
                                                      DS4_N_EMBD,
                                                      index_width,
                                                      g->attn_norm,
                                                      1) != 0;
            } else {
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_kv_cur, model->map, model->size,
                                                         layer->indexer_compressor_kv->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_sc_cur, model->map, model->size,
                                                         layer->indexer_compressor_gate->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
            }
            const uint32_t index_row = g->layer_n_index_comp[il];
            if (ok) ok = ds4_gpu_compressor_update_tensor(g->comp_kv_cur,
                                                            g->comp_sc_cur,
                                                            g->layer_index_state_kv[il],
                                                            g->layer_index_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
```

<｜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.c

```c
||
                layer->indexer_compressor_gate->dim[1] != index_width) {
                fprintf(stderr, "ds4: Metal graph indexer compressor expects paired F16 projections\n");
                ok = false;
            }
            if (ok && emit && g->layer_n_index_comp[il] >= g->layer_comp_cap[il]) {
                fprintf(stderr, "ds4: Metal graph indexer compressed KV cache capacity exceeded at layer %u\n", il);
                ok = false;
            }
            if (ok && !metal_graph_use_reference_compressor_pair_proj()) {
                ok = ds4_gpu_matmul_f16_pair_tensor(g->comp_kv_cur,
                                                      g->comp_sc_cur,
                                                      model->map,
                                                      model->size,
                                                      layer->indexer_compressor_kv->abs_offset,
                                                      layer->indexer_compressor_gate->abs_offset,
                                                      DS4_N_EMBD,
                                                      index_width,
                                                      g->attn_norm,
                                                      1) != 0;
            } else {
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_kv_cur, model->map, model->size,
                                                         layer->indexer_compressor_kv->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->comp_sc_cur, model->map, model->size,
                                                         layer->indexer_compressor_gate->abs_offset,
                                                         DS4_N_EMBD, index_width,
                                                         g->attn_norm, 1) != 0;
            }
            const uint32_t index_row = g->layer_n_index_comp[il];
            if (ok) ok = ds4_gpu_compressor_update_tensor(g->comp_kv_cur,
                                                            g->comp_sc_cur,
                                                            g->layer_index_state_kv[il],
                                                            g->layer_index_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
```<｜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.c

```c
_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
                                                            model->size,
                                                            layer->indexer_compressor_ape->abs_offset,
                                                            layer->indexer_compressor_ape->type,
                                                            layer->indexer_compressor_norm->abs_offset,
                                                            layer->indexer_compressor_norm->type,
                                                            DS4_N_INDEXER_HEAD_DIM,
                                                            ratio,
                                                            pos,
                                                            index_row,
                                                            DS4_N_ROT,
                                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                            freq_base,
                                                            freq_scale,
                                                            ext_factor,
                                                            attn_factor,
                                                            DS4_ROPE_YARN_BETA_FAST,
                                                            DS4_ROPE_YARN_BETA_SLOW,
                                                            DS4_RMS_EPS) != 0;
            if (ok && emit) g->layer_n_index_comp[il]++;
            const uint32_t decode_top_k = metal_graph_decode_indexer_top_k(g);
            if (ok && g->layer_n_comp[il] > decode_top_k) {
                const uint64_t indexer_q_dim = (uint64_t)DS4_N_INDEXER_HEAD * DS4_N_INDEXER_HEAD_DIM;
                if (!layer->indexer_attn_q_b ||
                    layer->indexer_attn_q_b->type != DS4_TENSOR_F16 ||
                    layer->indexer_attn_q_b->dim[0] != q_rank ||
                    layer->indexer_attn_q_b->dim[1] != indexer_q_dim) {
                    fprintf(stderr, "ds4: Metal graph indexer q projection expects F16 weights\n");
                    ok = false;
                }
                if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
```

<｜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.c

```c
_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
                                                            model->size,
                                                            layer->indexer_compressor_ape->abs_offset,
                                                            layer->indexer_compressor_ape->type,
                                                            layer->indexer_compressor_norm->abs_offset,
                                                            layer->indexer_compressor_norm->type,
                                                            DS4_N_INDEXER_HEAD_DIM,
                                                            ratio,
                                                            pos,
                                                            index_row,
                                                            DS4_N_ROT,
                                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                            freq_base,
                                                            freq_scale,
                                                            ext_factor,
                                                            attn_factor,
                                                            DS4_ROPE_YARN_BETA_FAST,
                                                            DS4_ROPE_YARN_BETA_SLOW,
                                                            DS4_RMS_EPS) != 0;
            if (ok && emit) g->layer_n_index_comp[il]++;
            const uint32_t decode_top_k = metal_graph_decode_indexer_top_k(g);
            if (ok && g->layer_n_comp[il] > decode_top_k) {
                const uint64_t indexer_q_dim = (uint64_t)DS4_N_INDEXER_HEAD * DS4_N_INDEXER_HEAD_DIM;
                if (!layer->indexer_attn_q_b ||
                    layer->indexer_attn_q_b->type != DS4_TENSOR_F16 ||
                    layer->indexer_attn_q_b->dim[0] != q_rank ||
                    layer->indexer_attn_q_b->dim[1] != indexer_q_dim) {
                    fprintf(stderr, "ds4: Metal graph indexer q projection expects F16 weights\n");
                    ok = false;
                }
                if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
```<｜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.c

```c
_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
                                                            model->size,
                                                            layer->indexer_compressor_ape->abs_offset,
                                                            layer->indexer_compressor_ape->type,
                                                            layer->indexer_compressor_norm->abs_offset,
                                                            layer->indexer_compressor_norm->type,
                                                            DS4_N_INDEXER_HEAD_DIM,
                                                            ratio,
                                                            pos,
                                                            index_row,
                                                            DS4_N_ROT,
                                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                            freq_base,
                                                            freq_scale,
                                                            ext_factor,
                                                            attn_factor,
                                                            DS4_ROPE_YARN_BETA_FAST,
                                                            DS4_ROPE_YARN_BETA_SLOW,
                                                            DS4_RMS_EPS) != 0;
            if (ok && emit) g->layer_n_index_comp[il]++;
            const uint32_t decode_top_k = metal_graph_decode_indexer_top_k(g);
            if (ok && g->layer_n_comp[il] > decode_top_k) {
                const uint64_t indexer_q_dim = (uint64_t)DS4_N_INDEXER_HEAD * DS4_N_INDEXER_HEAD_DIM;
                if (!layer->indexer_attn_q_b ||
                    layer->indexer_attn_q_b->type != DS4_TENSOR_F16 ||
                    layer->indexer_attn_q_b->dim[0] != q_rank ||
                    layer->indexer_attn_q_b->dim[1] != indexer_q_dim) {
                    fprintf(stderr, "ds4: Metal graph indexer q projection expects F16 weights\n");
                    ok = false;
                }
                if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
```

<｜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.c

```c
_state_score[il],
                                                            g->layer_index_comp_cache[il],
                                                            model->map,
                                                            model->size,
                                                            layer->indexer_compressor_ape->abs_offset,
                                                            layer->indexer_compressor_ape->type,
                                                            layer->indexer_compressor_norm->abs_offset,
                                                            layer->indexer_compressor_norm->type,
                                                            DS4_N_INDEXER_HEAD_DIM,
                                                            ratio,
                                                            pos,
                                                            index_row,
                                                            DS4_N_ROT,
                                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                            freq_base,
                                                            freq_scale,
                                                            ext_factor,
                                                            attn_factor,
                                                            DS4_ROPE_YARN_BETA_FAST,
                                                            DS4_ROPE_YARN_BETA_SLOW,
                                                            DS4_RMS_EPS) != 0;
            if (ok && emit) g->layer_n_index_comp[il]++;
            const uint32_t decode_top_k = metal_graph_decode_indexer_top_k(g);
            if (ok && g->layer_n_comp[il] > decode_top_k) {
                const uint64_t indexer_q_dim = (uint64_t)DS4_N_INDEXER_HEAD * DS4_N_INDEXER_HEAD_DIM;
                if (!layer->indexer_attn_q_b ||
                    layer->indexer_attn_q_b->type != DS4_TENSOR_F16 ||
                    layer->indexer_attn_q_b->dim[0] != q_rank ||
                    layer->indexer_attn_q_b->dim[1] != indexer_q_dim) {
                    fprintf(stderr, "ds4: Metal graph indexer q projection expects F16 weights\n");
                    ok = false;
                }
                if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
```<｜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.c

```c
if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
                           layer->indexer_proj->dim[1] != DS4_N_INDEXER_HEAD)) {
                    fprintf(stderr, "ds4: Metal graph indexer weight projection expects F16 weights\n");
                    ok = false;
                }
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_q, model->map, model->size,
                                                         layer->indexer_attn_q_b->abs_offset,
                                                         q_rank, indexer_q_dim,
                                                         g->qr_norm, 1) != 0;
                if (ok) ok = ds4_gpu_rope_tail_tensor(g->indexer_q, 1,
                                                        DS4_N_INDEXER_HEAD,
                                                        DS4_N_INDEXER_HEAD_DIM,
                                                        DS4_N_ROT,
                                                        pos,
                                                        compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                        false,
                                                        freq_base,
                                                        freq_scale,
                                                        ext_factor,
                                                        attn_factor,
                                                        DS4_ROPE_YARN_BETA_FAST,
                                                        DS4_ROPE_YARN_BETA_SLOW) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_weights, model->map, model->size,
                                                         layer->indexer_proj->abs_offset,
                                                         DS4_N_EMBD, DS4_N_INDEXER_HEAD,
                                                         g->attn_norm, 1) != 0;
                const float index_scale = 1.0f / sqrtf((float)(DS4_N_INDEXER_HEAD_DIM * DS4_N_INDEXER_HEAD));
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary(NULL,
                                                                    il,
                                                                    pos,
                                                                    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｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4.c

```c
if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
                           layer->indexer_proj->dim[1] != DS4_N_INDEXER_HEAD)) {
                    fprintf(stderr, "ds4: Metal graph indexer weight projection expects F16 weights\n");
                    ok = false;
                }
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_q, model->map, model->size,
                                                         layer->indexer_attn_q_b->abs_offset,
                                                         q_rank, indexer_q_dim,
                                                         g->qr_norm, 1) != 0;
                if (ok) ok = ds4_gpu_rope_tail_tensor(g->indexer_q, 1,
                                                        DS4_N_INDEXER_HEAD,
                                                        DS4_N_INDEXER_HEAD_DIM,
                                                        DS4_N_ROT,
                                                        pos,
                                                        compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                        false,
                                                        freq_base,
                                                        freq_scale,
                                                        ext_factor,
                                                        attn_factor,
                                                        DS4_ROPE_YARN_BETA_FAST,
                                                        DS4_ROPE_YARN_BETA_SLOW) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_weights, model->map, model->size,
                                                         layer->indexer_proj->abs_offset,
                                                         DS4_N_EMBD, DS4_N_INDEXER_HEAD,
                                                         g->attn_norm, 1) != 0;
                const float index_scale = 1.0f / sqrtf((float)(DS4_N_INDEXER_HEAD_DIM * DS4_N_INDEXER_HEAD));
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary(NULL,
                                                                    il,
                                                                    pos,
                                                                    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]
Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4.c

```c
if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
                           layer->indexer_proj->dim[1] != DS4_N_INDEXER_HEAD)) {
                    fprintf(stderr, "ds4: Metal graph indexer weight projection expects F16 weights\n");
                    ok = false;
                }
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_q, model->map, model->size,
                                                         layer->indexer_attn_q_b->abs_offset,
                                                         q_rank, indexer_q_dim,
                                                         g->qr_norm, 1) != 0;
                if (ok) ok = ds4_gpu_rope_tail_tensor(g->indexer_q, 1,
                                                        DS4_N_INDEXER_HEAD,
                                                        DS4_N_INDEXER_HEAD_DIM,
                                                        DS4_N_ROT,
                                                        pos,
                                                        compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                        false,
                                                        freq_base,
                                                        freq_scale,
                                                        ext_factor,
                                                        attn_factor,
                                                        DS4_ROPE_YARN_BETA_FAST,
                                                        DS4_ROPE_YARN_BETA_SLOW) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_weights, model->map, model->size,
                                                         layer->indexer_proj->abs_offset,
                                                         DS4_N_EMBD, DS4_N_INDEXER_HEAD,
                                                         g->attn_norm, 1) != 0;
                const float index_scale = 1.0f / sqrtf((float)(DS4_N_INDEXER_HEAD_DIM * DS4_N_INDEXER_HEAD));
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary(NULL,
                                                                    il,
                                                                    pos,
                                                                    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｜>Trova bug sottili e spiega quali invarianti dell'inferenza possono rompersi.

File: ds4.c

```c
if (ok && (!layer->indexer_proj ||
                           layer->indexer_proj->type != DS4_TENSOR_F16 ||
                           layer->indexer_proj->dim[0] != DS4_N_EMBD ||
                           layer->indexer_proj->dim[1] != DS4_N_INDEXER_HEAD)) {
                    fprintf(stderr, "ds4: Metal graph indexer weight projection expects F16 weights\n");
                    ok = false;
                }
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_q, model->map, model->size,
                                                         layer->indexer_attn_q_b->abs_offset,
                                                         q_rank, indexer_q_dim,
                                                         g->qr_norm, 1) != 0;
                if (ok) ok = ds4_gpu_rope_tail_tensor(g->indexer_q, 1,
                                                        DS4_N_INDEXER_HEAD,
                                                        DS4_N_INDEXER_HEAD_DIM,
                                                        DS4_N_ROT,
                                                        pos,
                                                        compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                                        false,
                                                        freq_base,
                                                        freq_scale,
                                                        ext_factor,
                                                        attn_factor,
                                                        DS4_ROPE_YARN_BETA_FAST,
                                                        DS4_ROPE_YARN_BETA_SLOW) != 0;
                if (ok) ok = ds4_gpu_matmul_f16_tensor(g->indexer_weights, model->map, model->size,
                                                         layer->indexer_proj->abs_offset,
                                                         DS4_N_EMBD, DS4_N_INDEXER_HEAD,
                                                         g->attn_norm, 1) != 0;
                const float index_scale = 1.0f / sqrtf((float)(DS4_N_INDEXER_HEAD_DIM * DS4_N_INDEXER_HEAD));
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary(NULL,
                                                                    il,
                                                                    pos,
                                                                    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.c

```c
il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_score_one_tensor(g->indexer_scores,
                                                                g->indexer_q,
                                                                g->indexer_weights,
                                                                g->layer_index_comp_cache[il],
                                                                g->layer_n_index_comp[il],
                                                                DS4_N_INDEXER_HEAD,
                                                                DS4_N_INDEXER_HEAD_DIM,
                                                                index_scale) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_score",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_topk_tensor(g->comp_selected,
                                                           g->indexer_scores,
                                                           g->layer_n_index_comp[il],
                                                           1,
                                                           decode_top_k) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_topk",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
```

<｜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.c

```c
il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_score_one_tensor(g->indexer_scores,
                                                                g->indexer_q,
                                                                g->indexer_weights,
                                                                g->layer_index_comp_cache[il],
                                                                g->layer_n_index_comp[il],
                                                                DS4_N_INDEXER_HEAD,
                                                                DS4_N_INDEXER_HEAD_DIM,
                                                                index_scale) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_score",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_topk_tensor(g->comp_selected,
                                                           g->indexer_scores,
                                                           g->layer_n_index_comp[il],
                                                           1,
                                                           decode_top_k) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_topk",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
```<｜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.c

```c
il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_score_one_tensor(g->indexer_scores,
                                                                g->indexer_q,
                                                                g->indexer_weights,
                                                                g->layer_index_comp_cache[il],
                                                                g->layer_n_index_comp[il],
                                                                DS4_N_INDEXER_HEAD,
                                                                DS4_N_INDEXER_HEAD_DIM,
                                                                index_scale) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_score",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_topk_tensor(g->comp_selected,
                                                           g->indexer_scores,
                                                           g->layer_n_index_comp[il],
                                                           1,
                                                           decode_top_k) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_topk",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
```

<｜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.c

```c
il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_score_one_tensor(g->indexer_scores,
                                                                g->indexer_q,
                                                                g->indexer_weights,
                                                                g->layer_index_comp_cache[il],
                                                                g->layer_n_index_comp[il],
                                                                DS4_N_INDEXER_HEAD,
                                                                DS4_N_INDEXER_HEAD_DIM,
                                                                index_scale) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_score",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                if (ok) ok = ds4_gpu_indexer_topk_tensor(g->comp_selected,
                                                           g->indexer_scores,
                                                           g->layer_n_index_comp[il],
                                                           1,
                                                           decode_top_k) != 0;
                if (ok && decode_index_stage_profile) {
                    ok = metal_graph_indexer_stage_profile_boundary("decode_topk",
                                                                    il,
                                                                    pos,
                                                                    1,
                                                                    g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
```<｜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.c

```c
g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                /* Decode used to materialize a dense compressed-row mask and
                 * call the generic gathered FlashAttention wrapper below.
                 * That wrapper scans every compressed row and rejects long
                 * contexts once raw+compressed rows exceed 8192.  Ratio-4 DS4
                 * attention is sparse after indexer top-k, so use the private
                 * indexed attention kernel instead: it scans only SWA raw rows
                 * plus the selected compressed rows, matching prefill and
                 * avoiding the long-context decode failure. */
                if (ok) {
                    comp_selected = g->comp_selected;
                    n_selected = decode_top_k < g->layer_n_index_comp[il]
                        ? decode_top_k
                        : g->layer_n_index_comp[il];
                }
            }
        }

        n_comp = g->layer_n_comp[il];
        comp_cache = g->layer_attn_comp_cache[il];
    }
    DS4_METAL_PROFILE_DECODE_STAGE("compressor_indexer");

    if (ok) {
        const uint32_t raw_start = metal_graph_raw_start_for_span(g, pos, n_raw);
        if (n_comp != 0 && comp_selected != NULL && n_selected != 0) {
            ok = ds4_gpu_attention_indexed_mixed_batch_heads_tensor(
                    g->heads,
                    model->map,
                    model->size,
                    layer->attn_sinks->abs_offset,
                    g->q,
                    raw_cache,
                    comp_cache,
                    comp_selected,
                    1,
                    pos,
                    n_raw,
                    raw_cap,
                    raw_start,
                    n_comp,
                    n_selected,
                    g->raw_window,
                    ds4_layer_compress_ratio(il),
                    DS4_N_HEAD,
                    DS4_N_HEAD_DIM) != 0;
            if (ok && decode_index_stage_profile) {
                ok = metal_graph_indexer_stage_profile_boundary("decode_attention",
                                                                il,
                                                                pos,
                                                                1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
```

<｜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.c

```c
g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                /* Decode used to materialize a dense compressed-row mask and
                 * call the generic gathered FlashAttention wrapper below.
                 * That wrapper scans every compressed row and rejects long
                 * contexts once raw+compressed rows exceed 8192.  Ratio-4 DS4
                 * attention is sparse after indexer top-k, so use the private
                 * indexed attention kernel instead: it scans only SWA raw rows
                 * plus the selected compressed rows, matching prefill and
                 * avoiding the long-context decode failure. */
                if (ok) {
                    comp_selected = g->comp_selected;
                    n_selected = decode_top_k < g->layer_n_index_comp[il]
                        ? decode_top_k
                        : g->layer_n_index_comp[il];
                }
            }
        }

        n_comp = g->layer_n_comp[il];
        comp_cache = g->layer_attn_comp_cache[il];
    }
    DS4_METAL_PROFILE_DECODE_STAGE("compressor_indexer");

    if (ok) {
        const uint32_t raw_start = metal_graph_raw_start_for_span(g, pos, n_raw);
        if (n_comp != 0 && comp_selected != NULL && n_selected != 0) {
            ok = ds4_gpu_attention_indexed_mixed_batch_heads_tensor(
                    g->heads,
                    model->map,
                    model->size,
                    layer->attn_sinks->abs_offset,
                    g->q,
                    raw_cache,
                    comp_cache,
                    comp_selected,
                    1,
                    pos,
                    n_raw,
                    raw_cap,
                    raw_start,
                    n_comp,
                    n_selected,
                    g->raw_window,
                    ds4_layer_compress_ratio(il),
                    DS4_N_HEAD,
                    DS4_N_HEAD_DIM) != 0;
            if (ok && decode_index_stage_profile) {
                ok = metal_graph_indexer_stage_profile_boundary("decode_attention",
                                                                il,
                                                                pos,
                                                                1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
```<｜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.c

```c
g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                /* Decode used to materialize a dense compressed-row mask and
                 * call the generic gathered FlashAttention wrapper below.
                 * That wrapper scans every compressed row and rejects long
                 * contexts once raw+compressed rows exceed 8192.  Ratio-4 DS4
                 * attention is sparse after indexer top-k, so use the private
                 * indexed attention kernel instead: it scans only SWA raw rows
                 * plus the selected compressed rows, matching prefill and
                 * avoiding the long-context decode failure. */
                if (ok) {
                    comp_selected = g->comp_selected;
                    n_selected = decode_top_k < g->layer_n_index_comp[il]
                        ? decode_top_k
                        : g->layer_n_index_comp[il];
                }
            }
        }

        n_comp = g->layer_n_comp[il];
        comp_cache = g->layer_attn_comp_cache[il];
    }
    DS4_METAL_PROFILE_DECODE_STAGE("compressor_indexer");

    if (ok) {
        const uint32_t raw_start = metal_graph_raw_start_for_span(g, pos, n_raw);
        if (n_comp != 0 && comp_selected != NULL && n_selected != 0) {
            ok = ds4_gpu_attention_indexed_mixed_batch_heads_tensor(
                    g->heads,
                    model->map,
                    model->size,
                    layer->attn_sinks->abs_offset,
                    g->q,
                    raw_cache,
                    comp_cache,
                    comp_selected,
                    1,
                    pos,
                    n_raw,
                    raw_cap,
                    raw_start,
                    n_comp,
                    n_selected,
                    g->raw_window,
                    ds4_layer_compress_ratio(il),
                    DS4_N_HEAD,
                    DS4_N_HEAD_DIM) != 0;
            if (ok && decode_index_stage_profile) {
                ok = metal_graph_indexer_stage_profile_boundary("decode_attention",
                                                                il,
                                                                pos,
                                                                1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
```

<｜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.c

```c
g->layer_n_index_comp[il],
                                                                    &decode_index_stage_t0);
                }
                /* Decode used to materialize a dense compressed-row mask and
                 * call the generic gathered FlashAttention wrapper below.
                 * That wrapper scans every compressed row and rejects long
                 * contexts once raw+compressed rows exceed 8192.  Ratio-4 DS4
                 * attention is sparse after indexer top-k, so use the private
                 * indexed attention kernel instead: it scans only SWA raw rows
                 * plus the selected compressed rows, matching prefill and
                 * avoiding the long-context decode failure. */
                if (ok) {
                    comp_selected = g->comp_selected;
                    n_selected = decode_top_k < g->layer_n_index_comp[il]
                        ? decode_top_k
                        : g->layer_n_index_comp[il];
                }
            }
        }

        n_comp = g->layer_n_comp[il];
        comp_cache = g->layer_attn_comp_cache[il];
    }
    DS4_METAL_PROFILE_DECODE_STAGE("compressor_indexer");

    if (ok) {
        const uint32_t raw_start = metal_graph_raw_start_for_span(g, pos, n_raw);
        if (n_comp != 0 && comp_selected != NULL && n_selected != 0) {
            ok = ds4_gpu_attention_indexed_mixed_batch_heads_tensor(
                    g->heads,
                    model->map,
                    model->size,
                    layer->attn_sinks->abs_offset,
                    g->q,
                    raw_cache,
                    comp_cache,
                    comp_selected,
                    1,
                    pos,
                    n_raw,
                    raw_cap,
                    raw_start,
                    n_comp,
                    n_selected,
                    g->raw_window,
                    ds4_layer_compress_ratio(il),
                    DS4_N_HEAD,
                    DS4_N_HEAD_DIM) != 0;
            if (ok && decode_index_stage_profile) {
                ok = metal_graph_indexer_stage_profile_boundary("decode_attention",
                                                                il,
                                                                pos,
                                                                1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
```<｜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.c

```c
1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
            }
        } else {
            ok = ds4_gpu_attention_decode_heads_tensor(g->heads,
                                                         model->map, model->size,
                                                         layer->attn_sinks->abs_offset,
                                                         g->q, raw_cache, n_raw,
                                                         raw_cap,
                                                         raw_start,
                                                         n_comp ? comp_cache : NULL,
                                                         n_comp,
                                                         NULL,
                                                         0,
                                                         DS4_N_HEAD, DS4_N_HEAD_DIM) != 0;
        }
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attention");
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_out", g->heads, q_dim, il, pos);
    }
    if (ok) ok = ds4_gpu_rope_tail_tensor(g->heads,
                                            1, DS4_N_HEAD, DS4_N_HEAD_DIM,
                                            DS4_N_ROT, pos,
                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                            true,
                                            freq_base,
                                            freq_scale,
                                            ext_factor,
                                            attn_factor,
                                            DS4_ROPE_YARN_BETA_FAST,
                                            DS4_ROPE_YARN_BETA_SLOW) != 0;
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_back", g->heads, q_dim, il, pos);
    }
    const bool fuse_attn_out_hc =
        !metal_graph_directional_steering_attn_enabled(g) &&
        !metal_graph_use_reference_attn_out_hc();
    if (ok && fuse_attn_out_hc) {
        ok = ds4_gpu_attention_output_low_q8_tensor(g->attn_low,
                                                      model->map,
                                                      model->size,
                                                      layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
```

<｜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.c

```c
1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
            }
        } else {
            ok = ds4_gpu_attention_decode_heads_tensor(g->heads,
                                                         model->map, model->size,
                                                         layer->attn_sinks->abs_offset,
                                                         g->q, raw_cache, n_raw,
                                                         raw_cap,
                                                         raw_start,
                                                         n_comp ? comp_cache : NULL,
                                                         n_comp,
                                                         NULL,
                                                         0,
                                                         DS4_N_HEAD, DS4_N_HEAD_DIM) != 0;
        }
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attention");
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_out", g->heads, q_dim, il, pos);
    }
    if (ok) ok = ds4_gpu_rope_tail_tensor(g->heads,
                                            1, DS4_N_HEAD, DS4_N_HEAD_DIM,
                                            DS4_N_ROT, pos,
                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                            true,
                                            freq_base,
                                            freq_scale,
                                            ext_factor,
                                            attn_factor,
                                            DS4_ROPE_YARN_BETA_FAST,
                                            DS4_ROPE_YARN_BETA_SLOW) != 0;
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_back", g->heads, q_dim, il, pos);
    }
    const bool fuse_attn_out_hc =
        !metal_graph_directional_steering_attn_enabled(g) &&
        !metal_graph_use_reference_attn_out_hc();
    if (ok && fuse_attn_out_hc) {
        ok = ds4_gpu_attention_output_low_q8_tensor(g->attn_low,
                                                      model->map,
                                                      model->size,
                                                      layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
```<｜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.c

```c
1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
            }
        } else {
            ok = ds4_gpu_attention_decode_heads_tensor(g->heads,
                                                         model->map, model->size,
                                                         layer->attn_sinks->abs_offset,
                                                         g->q, raw_cache, n_raw,
                                                         raw_cap,
                                                         raw_start,
                                                         n_comp ? comp_cache : NULL,
                                                         n_comp,
                                                         NULL,
                                                         0,
                                                         DS4_N_HEAD, DS4_N_HEAD_DIM) != 0;
        }
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attention");
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_out", g->heads, q_dim, il, pos);
    }
    if (ok) ok = ds4_gpu_rope_tail_tensor(g->heads,
                                            1, DS4_N_HEAD, DS4_N_HEAD_DIM,
                                            DS4_N_ROT, pos,
                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                            true,
                                            freq_base,
                                            freq_scale,
                                            ext_factor,
                                            attn_factor,
                                            DS4_ROPE_YARN_BETA_FAST,
                                            DS4_ROPE_YARN_BETA_SLOW) != 0;
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_back", g->heads, q_dim, il, pos);
    }
    const bool fuse_attn_out_hc =
        !metal_graph_directional_steering_attn_enabled(g) &&
        !metal_graph_use_reference_attn_out_hc();
    if (ok && fuse_attn_out_hc) {
        ok = ds4_gpu_attention_output_low_q8_tensor(g->attn_low,
                                                      model->map,
                                                      model->size,
                                                      layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
```

<｜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.c

```c
1,
                                                                n_comp,
                                                                &decode_index_stage_t0);
            }
        } else {
            ok = ds4_gpu_attention_decode_heads_tensor(g->heads,
                                                         model->map, model->size,
                                                         layer->attn_sinks->abs_offset,
                                                         g->q, raw_cache, n_raw,
                                                         raw_cap,
                                                         raw_start,
                                                         n_comp ? comp_cache : NULL,
                                                         n_comp,
                                                         NULL,
                                                         0,
                                                         DS4_N_HEAD, DS4_N_HEAD_DIM) != 0;
        }
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attention");
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_out", g->heads, q_dim, il, pos);
    }
    if (ok) ok = ds4_gpu_rope_tail_tensor(g->heads,
                                            1, DS4_N_HEAD, DS4_N_HEAD_DIM,
                                            DS4_N_ROT, pos,
                                            compressed ? (uint32_t)DS4_ROPE_ORIG_CTX : 0,
                                            true,
                                            freq_base,
                                            freq_scale,
                                            ext_factor,
                                            attn_factor,
                                            DS4_ROPE_YARN_BETA_FAST,
                                            DS4_ROPE_YARN_BETA_SLOW) != 0;
    if (ok) {
        metal_graph_debug_dump_tensor("kqv_back", g->heads, q_dim, il, pos);
    }
    const bool fuse_attn_out_hc =
        !metal_graph_directional_steering_attn_enabled(g) &&
        !metal_graph_use_reference_attn_out_hc();
    if (ok && fuse_attn_out_hc) {
        ok = ds4_gpu_attention_output_low_q8_tensor(g->attn_low,
                                                      model->map,
                                                      model->size,
                                                      layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
```<｜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.c

```c
layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
                                                      n_groups,
                                                      g->heads) != 0;
        if (ok) {
            ok = ds4_gpu_matmul_q8_0_hc_expand_tensor(g->after_attn_hc,
                                                        g->attn_out,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_b->abs_offset,
                                                        (uint64_t)n_groups * rank,
                                                        DS4_N_EMBD,
                                                        g->attn_low,
                                                        g->cur_hc,
                                                        g->hc_split,
                                                        DS4_N_EMBD,
                                                        DS4_N_HC) != 0;
        }
    } else if (ok) {
        ok = ds4_gpu_attention_output_q8_batch_tensor(g->attn_out,
                                                        g->attn_low,
                                                        g->batch_group_tmp,
                                                        g->batch_low_tmp,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_a->abs_offset,
                                                        layer->attn_output_b->abs_offset,
                                                        group_dim, rank,
                                                        n_groups, DS4_N_EMBD,
                                                        g->heads, 1) != 0;
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attn_output");
    if (ok) {
        metal_graph_debug_dump_tensor("attn_low", g->attn_low, (uint64_t)n_groups * rank, il, pos);
    }
    if (ok) {
        metal_graph_debug_dump_tensor("attn_out", g->attn_out, DS4_N_EMBD, il, pos);
    }
    if (ok && metal_graph_directional_steering_attn_enabled(g)) {
        ok = metal_graph_apply_directional_steering_attn(g, g->attn_out, il, 1);
    }
    if (ok && !fuse_attn_out_hc) {
```

<｜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.c

```c
layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
                                                      n_groups,
                                                      g->heads) != 0;
        if (ok) {
            ok = ds4_gpu_matmul_q8_0_hc_expand_tensor(g->after_attn_hc,
                                                        g->attn_out,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_b->abs_offset,
                                                        (uint64_t)n_groups * rank,
                                                        DS4_N_EMBD,
                                                        g->attn_low,
                                                        g->cur_hc,
                                                        g->hc_split,
                                                        DS4_N_EMBD,
                                                        DS4_N_HC) != 0;
        }
    } else if (ok) {
        ok = ds4_gpu_attention_output_q8_batch_tensor(g->attn_out,
                                                        g->attn_low,
                                                        g->batch_group_tmp,
                                                        g->batch_low_tmp,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_a->abs_offset,
                                                        layer->attn_output_b->abs_offset,
                                                        group_dim, rank,
                                                        n_groups, DS4_N_EMBD,
                                                        g->heads, 1) != 0;
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attn_output");
    if (ok) {
        metal_graph_debug_dump_tensor("attn_low", g->attn_low, (uint64_t)n_groups * rank, il, pos);
    }
    if (ok) {
        metal_graph_debug_dump_tensor("attn_out", g->attn_out, DS4_N_EMBD, il, pos);
    }
    if (ok && metal_graph_directional_steering_attn_enabled(g)) {
        ok = metal_graph_apply_directional_steering_attn(g, g->attn_out, il, 1);
    }
    if (ok && !fuse_attn_out_hc) {
```<｜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.c

```c
layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
                                                      n_groups,
                                                      g->heads) != 0;
        if (ok) {
            ok = ds4_gpu_matmul_q8_0_hc_expand_tensor(g->after_attn_hc,
                                                        g->attn_out,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_b->abs_offset,
                                                        (uint64_t)n_groups * rank,
                                                        DS4_N_EMBD,
                                                        g->attn_low,
                                                        g->cur_hc,
                                                        g->hc_split,
                                                        DS4_N_EMBD,
                                                        DS4_N_HC) != 0;
        }
    } else if (ok) {
        ok = ds4_gpu_attention_output_q8_batch_tensor(g->attn_out,
                                                        g->attn_low,
                                                        g->batch_group_tmp,
                                                        g->batch_low_tmp,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_a->abs_offset,
                                                        layer->attn_output_b->abs_offset,
                                                        group_dim, rank,
                                                        n_groups, DS4_N_EMBD,
                                                        g->heads, 1) != 0;
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attn_output");
    if (ok) {
        metal_graph_debug_dump_tensor("attn_low", g->attn_low, (uint64_t)n_groups * rank, il, pos);
    }
    if (ok) {
        metal_graph_debug_dump_tensor("attn_out", g->attn_out, DS4_N_EMBD, il, pos);
    }
    if (ok && metal_graph_directional_steering_attn_enabled(g)) {
        ok = metal_graph_apply_directional_steering_attn(g, g->attn_out, il, 1);
    }
    if (ok && !fuse_attn_out_hc) {
```

<｜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.c

```c
layer->attn_output_a->abs_offset,
                                                      group_dim,
                                                      rank,
                                                      n_groups,
                                                      g->heads) != 0;
        if (ok) {
            ok = ds4_gpu_matmul_q8_0_hc_expand_tensor(g->after_attn_hc,
                                                        g->attn_out,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_b->abs_offset,
                                                        (uint64_t)n_groups * rank,
                                                        DS4_N_EMBD,
                                                        g->attn_low,
                                                        g->cur_hc,
                                                        g->hc_split,
                                                        DS4_N_EMBD,
                                                        DS4_N_HC) != 0;
        }
    } else if (ok) {
        ok = ds4_gpu_attention_output_q8_batch_tensor(g->attn_out,
                                                        g->attn_low,
                                                        g->batch_group_tmp,
                                                        g->batch_low_tmp,
                                                        model->map,
                                                        model->size,
                                                        layer->attn_output_a->abs_offset,
                                                        layer->attn_output_b->abs_offset,
                                                        group_dim, rank,
                                                        n_groups, DS4_N_EMBD,
                                                        g->heads, 1) != 0;
    }
    DS4_METAL_PROFILE_DECODE_STAGE("attn_output");
    if (ok) {
        metal_graph_debug_dump_tensor("attn_low", g->attn_low, (uint64_t)n_groups * rank, il, pos);
    }
    if (ok) {
        metal_graph_debug_dump_tensor("attn_out", g->attn_out, DS4_N_EMBD, il, pos);
    }
    if (ok && metal_graph_directional_steering_attn_enabled(g)) {
        ok = metal_graph_apply_directional_steering_attn(g, g->attn_out, il, 1);
    }
    if (ok && !fuse_attn_out_hc) {
```<｜Assistant｜><think>