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[SYCL] Add BF16 support to GET_ROWS operation (#21391)

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Add GGML_TYPE_BF16 to the SYCL backend's GET_ROWS operation, both in
supports_op and in the kernel dispatch. This fixes a performance
regression where models using BF16 embedding tensors (e.g., Gemma4's
per_layer_token_embd.weight) fall back to CPU for the GET_ROWS op,
causing a full GPU-to-CPU tensor transfer every token.

The fix reuses the existing get_rows_sycl_float template with
sycl::ext::oneapi::bfloat16, matching the pattern already used for
sycl::half (F16) and float (F32).
This commit is contained in:
Devedse
2026-05-09 07:50:24 +02:00
committed by GitHub
parent 60489932ec
commit fd89556567
2 changed files with 5 additions and 0 deletions
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4
ggml/src/ggml-sycl/getrows.cpp
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@@ -183,6 +183,10 @@ void ggml_sycl_op_get_rows(ggml_backend_sycl_context & ctx, ggml_tensor * dst) {
get_rows_sycl_float(ctx, dst->src[0], dst->src[1], dst, (const sycl::half *)dst->src[0]->data,
src1_i32, (float *)dst->data, ctx.stream());
break;
case GGML_TYPE_BF16:
get_rows_sycl_float(ctx, dst->src[0], dst->src[1], dst, (const sycl::ext::oneapi::bfloat16 *)dst->src[0]->data,
src1_i32, (float *)dst->data, ctx.stream());
break;
case GGML_TYPE_F32:
get_rows_sycl_float(ctx, dst->src[0], dst->src[1], dst, (const float *)dst->src[0]->data,
src1_i32, (float *)dst->data, ctx.stream());

1
ggml/src/ggml-sycl/ggml-sycl.cpp
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@@ -4974,6 +4974,7 @@ static bool ggml_backend_sycl_device_supports_op(ggml_backend_dev_t dev, const g
{
switch (op->src[0]->type) {
case GGML_TYPE_F16:
case GGML_TYPE_BF16:
case GGML_TYPE_F32:
case GGML_TYPE_Q4_0:
case GGML_TYPE_Q4_1: