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Enable FMA with MSVC (through /arch:AVX2). To make this possible, I also has to turn the #warning regarding AVX512-FMA to a #error.

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This commit is contained in:
Gael Guennebaud
2018-12-07 15:14:50 +01:00
parent f233c6194d
commit 7b6d0ff1f6
4 changed files with 22 additions and 7 deletions
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8
Eigen/src/Core/util/ConfigureVectorization.h
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@@ -250,15 +250,17 @@
#define EIGEN_VECTORIZE_SSE4_1
#define EIGEN_VECTORIZE_SSE4_2
#endif
#ifdef __FMA__
#if defined(__FMA__) || (EIGEN_COMP_MSVC && defined(__AVX2__))
// MSVC does not expose a switch dedicated for FMA
// For MSVC, AVX2 => FMA
#define EIGEN_VECTORIZE_FMA
#endif
#if defined(__AVX512F__)
#ifndef __FMA__
#if EIGEN_COMP_GNUC
#warning Please add -mfma to your compiler flags: compiling with -mavx512f alone without SSE/AVX FMA is not supported (bug 1638).
#error Please add -mfma to your compiler flags: compiling with -mavx512f alone without SSE/AVX FMA is not supported (bug 1638).
#else
#error Please enable FMA in your compiler flags (e.g. -mfma): compiling with AVX512 alone without SSE/AVX FMA is not supported (bug 1638).
#error Please enable FMA in your compiler flags (e.g. -mfma): compiling with AVX512 alone without SSE/AVX FMA is not supported (bug 1638).
#endif
#endif
#define EIGEN_VECTORIZE_AVX512