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Fix half_impl::float_to_half_rtne(float) warning: '<<' causes overflow

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Fixed Visual Studio 2019 Code Analysis (C++ Core Guidelines) warning
C26450 from inside `half_impl::float_to_half_rtne(float)`:
> Arithmetic overflow: '<<' operation causes overflow at compile time.
This commit is contained in:
Niels Dekker 2020-09-10 16:22:28 +02:00
parent 35d149e34c
commit 5328c9be43
1 changed files with 3 additions and 1 deletions
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Eigen/src/Core/arch/Default/Half.h
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@ -472,7 +472,9 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC __half_raw float_to_half_rtne(float ff) {
unsigned int mant_odd = (f.u >> 13) & 1; // resulting mantissa is odd
// update exponent, rounding bias part 1
f.u += ((unsigned int)(15 - 127) << 23) + 0xfff;
// Equivalent to `f.u += ((unsigned int)(15 - 127) << 23) + 0xfff`, but
// without arithmetic overflow.
f.u += 0xc8000fffU;
// rounding bias part 2
f.u += mant_odd;
// take the bits!