Merge pull request #12749 from powderluv:fix-clang-cl-tzcnt

7 years ago · aeec6e43eb
parent ceca139f7f 630a94b8b7
commit aeec6e43eb
1 changed files with 3 additions and 0 deletions
--- a/modules/core/include/opencv2/core/hal/intrin.hpp
+++ b/modules/core/include/opencv2/core/hal/intrin.hpp
@ -368,6 +368,9 @@ inline unsigned int trailingZeros32(unsigned int value) {
    unsigned long index = 0;
    _BitScanForward(&index, value);
    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
    return _tzcnt_u32(value);
 #endif