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sanitizer_common: Fix implementation of bit count operations on 64-bit Windows. 

llvm-svn: 242002
This commit is contained in:
Peter Collingbourne 2015-07-13 00:26:03 +00:00
parent bcda1a9492
commit cc8bb21e59
1 changed files with 9 additions and 11 deletions
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20
compiler-rt/lib/sanitizer_common/sanitizer_common.h
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@ -355,7 +355,11 @@ INLINE uptr MostSignificantSetBitIndex(uptr x) {
CHECK_NE(x, 0U);
unsigned long up; // NOLINT
#if !SANITIZER_WINDOWS || defined(__clang__) || defined(__GNUC__)
# ifdef _WIN64
up = SANITIZER_WORDSIZE - 1 - __builtin_clzll(x);
# else
up = SANITIZER_WORDSIZE - 1 - __builtin_clzl(x);
# endif
#elif defined(_WIN64)
_BitScanReverse64(&up, x);
#else
@ -368,7 +372,11 @@ INLINE uptr LeastSignificantSetBitIndex(uptr x) {
CHECK_NE(x, 0U);
unsigned long up; // NOLINT
#if !SANITIZER_WINDOWS || defined(__clang__) || defined(__GNUC__)
# ifdef _WIN64
up = __builtin_ctzll(x);
# else
up = __builtin_ctzl(x);
# endif
#elif defined(_WIN64)
_BitScanForward64(&up, x);
#else
@ -406,17 +414,7 @@ INLINE bool IsAligned(uptr a, uptr alignment) {
INLINE uptr Log2(uptr x) {
CHECK(IsPowerOfTwo(x));
#if !SANITIZER_WINDOWS || defined(__clang__) || defined(__GNUC__)
return __builtin_ctzl(x);
#elif defined(_WIN64)
unsigned long ret; // NOLINT
_BitScanForward64(&ret, x);
return ret;
#else
unsigned long ret; // NOLINT
_BitScanForward(&ret, x);
return ret;
#endif
return LeastSignificantSetBitIndex(x);
}
// Don't use std::min, std::max or std::swap, to minimize dependency