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HIP: use v_dot2_f32_f16 instruction for FA (#15884)

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Johannes Gäßler
2025-09-09 14:04:43 +02:00
committed by GitHub
parent ed54e32558
commit 17bc5a815f
2 changed files with 26 additions and 6 deletions
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25
ggml/src/ggml-cuda/common.cuh
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@@ -545,6 +545,31 @@ static __device__ __forceinline__ int ggml_cuda_dp4a(const int a, const int b, i
#endif // defined(GGML_USE_HIP)
}
static __device__ __forceinline__ void ggml_cuda_mad(float & acc, const float v, const float u) {
acc += v*u;
}
static __device__ __forceinline__ void ggml_cuda_mad(float & acc, const float2 v, const float2 u) {
acc += v.x*u.x;
acc += v.y*u.y;
}
static __device__ __forceinline__ void ggml_cuda_mad(float & acc, const half2 v, const half2 u) {
#if defined(GGML_USE_HIP) && defined(GCN)
asm volatile("v_dot2_f32_f16 %0, %1, %2, %0" : "+v"(acc) : "v"(v), "v"(u));
#else
#ifdef FAST_FP16_AVAILABLE
const float2 tmp = __half22float2(v*u);
acc += tmp.x + tmp.y;
#else
const float2 tmpv = __half22float2(v);
const float2 tmpu = __half22float2(u);
acc += tmpv.x * tmpu.x;
acc += tmpv.y * tmpu.y;
#endif // FAST_FP16_AVAILABLE
#endif // defined(GGML_USE_HIP) && defined(GCN)
}
static __device__ __forceinline__ float ggml_cuda_e8m0_to_fp32(uint8_t x) {
#if CUDART_VERSION >= 12080
const nv_bfloat16 e = __nv_cvt_e8m0_to_bf16raw(x);