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bug #1638: add a warning if avx512 is enabled without SSE/AVX FMA

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This commit is contained in:
Gael Guennebaud 2018-12-07 09:23:28 +01:00
parent 4e7746fe22
commit ae59a7652b
1 changed files with 7 additions and 0 deletions
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7
Eigen/src/Core/util/ConfigureVectorization.h
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@ -254,6 +254,13 @@
#define EIGEN_VECTORIZE_FMA #define EIGEN_VECTORIZE_FMA
#endif #endif
#if defined(__AVX512F__) #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).
#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).
#endif
#endif
#define EIGEN_VECTORIZE_AVX512 #define EIGEN_VECTORIZE_AVX512
#define EIGEN_VECTORIZE_AVX2 #define EIGEN_VECTORIZE_AVX2
#define EIGEN_VECTORIZE_AVX #define EIGEN_VECTORIZE_AVX