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sqrt support fp8 #97

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Merged
miaobyte merged 1 commit into from
Jul 10, 2025
Merged

sqrt support fp8 #97

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22 changes: 22 additions & 0 deletions excuter/op-mem-cuda/src/deepx/tensorfunc/cuda_math.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
#include <cuda_runtime.h>
#include <cuda_fp16.h>
#include <cuda_bf16.h>
#include <cuda_fp8.h>
#include <cublas_v2.h>

namespace deepx::tensorfunc
Expand Down Expand Up @@ -37,6 +38,27 @@ namespace deepx::tensorfunc
*out = hsqrt(*a);
}

template <>
__device__ __forceinline__ void deepx_sqrt<__nv_fp8_e4m3>(const __nv_fp8_e4m3 *a, __nv_fp8_e4m3 *out)
{
__half input_fp16 = __nv_cvt_fp8_to_halfraw(static_cast<__nv_fp8_storage_t>(*a), __NV_E4M3);
__half result_fp16 = hsqrt(input_fp16); // CUDA 内置半精度平方根
*out = static_cast<__nv_fp8_e4m3>(__nv_cvt_halfraw_to_fp8(result_fp16, __NV_SATFINITE, __NV_E4M3));
}

template <>
__device__ __forceinline__ void deepx_sqrt<__nv_fp8_e5m2>(const __nv_fp8_e5m2 *a, __nv_fp8_e5m2 *out)
{
__half input_fp16 = __nv_cvt_fp8_to_halfraw(static_cast<__nv_fp8_storage_t>(*a), __NV_E5M2);

// 2. 执行平方根
__half result_fp16 = hsqrt(input_fp16);

// 3. 转回 FP8 → E5M2 格式
*out =static_cast<__nv_fp8_e5m2>(__nv_cvt_halfraw_to_fp8(result_fp16, __NV_SATFINITE, __NV_E5M2));
}


// pow
template <typename T>
__device__ __forceinline__ void deepx_pow(const T *a, const T *b, T *out);
Expand Down