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[Codegen, Cuda] Add overload for fp8x4 e5m2 <-> half4 conversion #16787

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Merged
tqchen merged 1 commit into from
Mar 26, 2024
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[Codegen, Cuda] Add overload for fp8x4 e5m2 <-> half4 conversion #16787

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23 changes: 22 additions & 1 deletion src/target/source/literal/cuda_half_t.h
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Original file line number Diff line number Diff line change
Expand Up @@ -410,7 +410,28 @@ struct __align__(8) half4 {
result.__x =
(static_cast<__uint32_t>(lo_part.__x) | (static_cast<__uint32_t>(hi_part.__x) << 16));
return result;
})";
}
__host__ __device__ explicit half4(const __nv_fp8x4_e5m2& fp8x4) {
__nv_fp8x2_e5m2 lo_part, hi_part;
lo_part.__x = static_cast<__nv_fp8x2_storage_t>(fp8x4.__x & 0xFFFF);
hi_part.__x = static_cast<__nv_fp8x2_storage_t>((fp8x4.__x >> 16) & 0xFFFF);
__half2 lo_half2 = static_cast<__half2>(lo_part);
__half2 hi_half2 = static_cast<__half2>(hi_part);
x = reinterpret_cast<__half*>(&lo_half2)[0];
y = reinterpret_cast<__half*>(&lo_half2)[1];
z = reinterpret_cast<__half*>(&hi_half2)[0];
w = reinterpret_cast<__half*>(&hi_half2)[1];
}
__host__ __device__ explicit operator __nv_fp8x4_e5m2() const {
__nv_fp8x4_e5m2 result;
__half2 lo_half2 = *reinterpret_cast<const __half2*>(&x);
__half2 hi_half2 = *reinterpret_cast<const __half2*>(&z);
__nv_fp8x2_e5m2 lo_part(lo_half2), hi_part(hi_half2);
result.__x =
(static_cast<__uint32_t>(lo_part.__x) | (static_cast<__uint32_t>(hi_part.__x) << 16));
return result;
}
)";
}
stream << R"(
};
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