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vulkan: Add bfloat16 support (#12554)

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* vulkan: Add bfloat16 support

This adds bfloat16 matrix multiply support based on VK_KHR_shader_bfloat16.
The extension is required for coopmat multiply support, but matrix-vector
multiply trivially promotes bf16 to fp32 and doesn't require the extension.
The copy/get_rows shaders also don't require the extension.

It's probably possible to fall back to non-coopmat and promote to fp32 when
the extension isn't supported, but this change doesn't do that.

The coopmat support also requires a glslc that supports the extension, which
currently requires a custom build.

* vulkan: Support bf16 tensors without the bf16 extension or coopmat support

Compile a variant of the scalar mul_mm shader that will promote the bf16
values to float, and use that when either the bf16 extension or the coopmat
extensions aren't available.

* vulkan: bfloat16 fixes (really works without bfloat16 support now)

* vulkan: fix spirv-val failure and reenable -O
This commit is contained in:
Jeff Bolz
2025-05-01 13:49:39 -05:00
committed by GitHub
parent fc727bcdd5
commit 79f26e9e12
13 changed files with 368 additions and 67 deletions
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8
ggml/src/ggml-vulkan/vulkan-shaders/dequant_funcs.comp
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@@ -23,6 +23,12 @@ vec2 dequantize(uint ib, uint iqs, uint a_offset) {
}
#endif
#if defined(DATA_A_BF16)
vec2 dequantize(uint ib, uint iqs, uint a_offset) {
return vec2(bf16_to_fp32(data_a[a_offset + ib]), bf16_to_fp32(data_a[a_offset + ib + 1]));
}
#endif
#if defined(DATA_A_Q4_0)
vec2 dequantize(uint ib, uint iqs, uint a_offset) {
const uint vui = uint(data_a[a_offset + ib].qs[iqs]);
@@ -428,7 +434,7 @@ vec4 dequantize4(uint ib, uint iqs, uint a_offset) {
}
#endif
#if defined(DATA_A_F32) || defined(DATA_A_F16)
#if defined(DATA_A_F32) || defined(DATA_A_F16) || defined(DATA_A_BF16)
vec2 get_dm(uint ib, uint a_offset) {
return vec2(0, 0);
}