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remove denormal flushing in fp32tobf16 for avx & avx512

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This commit is contained in:
Gauri Deshpande
2021-08-09 22:15:21 +00:00
committed by Rasmus Munk Larsen
parent 09d7122468
commit e6a5a594a7
4 changed files with 8 additions and 117 deletions
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7
Eigen/src/Core/arch/Default/BFloat16.h
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@@ -250,10 +250,6 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC __bfloat16_raw truncate_to_bfloat16(const
if (Eigen::numext::isnan EIGEN_NOT_A_MACRO(v)) {
output.value = std::signbit(v) ? 0xFFC0: 0x7FC0;
return output;
} else if (std::fabs(v) < std::numeric_limits<float>::min EIGEN_NOT_A_MACRO()) {
// Flush denormal to +/- 0.
output.value = std::signbit(v) ? 0x8000 : 0;
return output;
}
const uint16_t* p = reinterpret_cast<const uint16_t*>(&v);
#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
@@ -288,9 +284,6 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC __bfloat16_raw float_to_bfloat16_rtne<fals
// qNaN magic: All exponent bits set + most significant bit of fraction
// set.
output.value = std::signbit(ff) ? 0xFFC0: 0x7FC0;
} else if (std::fabs(ff) < std::numeric_limits<float>::min EIGEN_NOT_A_MACRO()) {
// Flush denormal to +/- 0.0
output.value = std::signbit(ff) ? 0x8000 : 0;
} else {
// Fast rounding algorithm that rounds a half value to nearest even. This
// reduces expected error when we convert a large number of floats. Here