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_tzcnt_u32() is undefined in clang-cl so use alternate impl

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_tzcnt_u32() is not exported by clang-cl intrin.h so check for
clang-cl and enable an alterate for _tzcnt_u32()

Some discussions:
http://lists.llvm.org/pipermail/cfe-dev/2016-October/051329.html
https://bugs.llvm.org/show_bug.cgi?id=30506

TEST=Build with clang-cl
This commit is contained in:
Anush Elangovan 2018-10-04 10:48:14 -07:00
parent 0ffc186680
commit 630a94b8b7
1 changed files with 3 additions and 0 deletions
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modules/core/include/opencv2/core/hal/intrin.hpp
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@ -368,6 +368,9 @@ inline unsigned int trailingZeros32(unsigned int value) {
unsigned long index = 0; unsigned long index = 0;
_BitScanForward(&index, value); _BitScanForward(&index, value);
return (unsigned int)index; return (unsigned int)index;
#elif defined(__clang__)
// clang-cl doesn't export _tzcnt_u32 for non BMI systems
return value ? __builtin_ctz(value) : 32;
#else #else
return _tzcnt_u32(value); return _tzcnt_u32(value);
#endif #endif