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[SYCL][ext] Add host impl for bf16 conversion #6492

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[SYCL][ext] Add host impl for bf16 conversion #6492

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19 changes: 7 additions & 12 deletions sycl/include/sycl/ext/oneapi/experimental/bfloat16.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -35,25 +35,20 @@ class bfloat16 {
return __spirv_ConvertFToBF16INTEL(a);
#endif
#else
(void)a;
throw exception{errc::feature_not_supported,
"Bfloat16 conversion is not supported on host device"};
float tmp = a;
uint32_t *res = reinterpret_cast<uint32_t *>(&tmp);
*res = *res >> 16;
return (storage_t)*res;
#endif
}
static float to_float(const storage_t &a) {
#if defined(__SYCL_DEVICE_ONLY__)
#if defined(__NVPTX__)
#if defined(__SPIR__)
return __spirv_ConvertBF16ToFINTEL(a);
#else
uint32_t y = a;
y = y << 16;
float *res = reinterpret_cast<float *>(&y);
return *res;
#else
return __spirv_ConvertBF16ToFINTEL(a);
#endif
#else
(void)a;
throw exception{errc::feature_not_supported,
"Bfloat16 conversion is not supported on host device"};
#endif
}

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