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Replace M_LOG2E and M_LN2 with custom macros.

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For these to exist we would need to define `_USE_MATH_DEFINES` before
`cmath` or `math.h` is first included.  However, we don't
control the include order for projects outside Eigen, so even defining
the macro in `Eigen/Core` does not fix the issue for projects that
end up including `<cmath>` before Eigen does (explicitly or transitively).

To fix this, we define `EIGEN_LOG2E` and `EIGEN_LN2` ourselves.
This commit is contained in:
Antonio Sanchez
2020-12-11 14:34:31 -08:00
parent e82722a4a7
commit c6efc4e0ba
7 changed files with 13 additions and 11 deletions
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Eigen/src/Core/arch/Default/BFloat16.h
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@@ -513,7 +513,7 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC bfloat16 log10(const bfloat16& a) {
return bfloat16(::log10f(float(a)));
}
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC bfloat16 log2(const bfloat16& a) {
return bfloat16(static_cast<float>(M_LOG2E) * ::logf(float(a)));
return bfloat16(static_cast<float>(EIGEN_LOG2E) * ::logf(float(a)));
}
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC bfloat16 sqrt(const bfloat16& a) {
return bfloat16(::sqrtf(float(a)));