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Include immintrin.h if F16C is available and vectorization is disabled

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If EIGEN_DONT_VECTORIZE is defined, immintrin.h is not included even if F16C is available. Trying to use F16C intrinsics thus fails.

This fixes issue #2395.
This commit is contained in:
David Tellenbach 2021-12-25 19:51:42 +00:00
parent f7a056bf04
commit c06c3e52a0
1 changed files with 5 additions and 3 deletions
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8
Eigen/src/Core/util/ConfigureVectorization.h
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@ -420,9 +420,11 @@
// We can use the optimized fp16 to float and float to fp16 conversion routines
#define EIGEN_HAS_FP16_C
#if EIGEN_COMP_CLANG
// Workaround for clang: The FP16C intrinsics for clang are included by
// immintrin.h, as opposed to emmintrin.h as suggested by Intel:
#if EIGEN_COMP_GNUC
// Make sure immintrin.h is included, even if e.g. vectorization is
// explicitly disabled (see also issue #2395).
// Note that FP16C intrinsics for gcc and clang are included by immintrin.h,
// as opposed to emmintrin.h as suggested by Intel:
// https://software.intel.com/sites/landingpage/IntrinsicsGuide/#othertechs=FP16C&expand=1711
#include <immintrin.h>
#endif