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Enable built in counting trailing zeros function for Intel compiler and clang.

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This commit is contained in:
matze 2016-09-14 18:20:47 +02:00
parent a865876c0f
commit 975d2e4294
1 changed files with 4 additions and 4 deletions
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8
modules/imgproc/src/contours.cpp
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@ -59,10 +59,10 @@ inline unsigned int trailingZeros(unsigned int value) {
#endif
#elif defined(__GNUC__) || defined(__GNUG__)
return __builtin_ctz(value);
//#elif defined(__ICC) || defined(__INTEL_COMPILER)
// return _bit_scan_forward(value);
//#elif defined(__clang__)
// return llvm.cttz.i32(value, true);
#elif defined(__ICC) || defined(__INTEL_COMPILER)
return _bit_scan_forward(value);
#elif defined(__clang__)
return llvm.cttz.i32(value, true);
#else
static const int MultiplyDeBruijnBitPosition[32] = {
0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,