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fix undefined shift in countLeadingZeros (#1157)

This commit is contained in:
Catena cyber 2018-06-03 16:26:12 +02:00 committed by Nguyen Anh Quynh
parent 3f1141452e
commit 14cdd65dd2
1 changed files with 7 additions and 4 deletions
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11
MathExtras.h
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@ -425,14 +425,17 @@ static inline int64_t SignExtend64(uint64_t X, unsigned B) {
/// valid arguments. /// valid arguments.
static inline unsigned int countLeadingZeros(int x) static inline unsigned int countLeadingZeros(int x)
{ {
unsigned count = 0;
int i; int i;
const unsigned bits = sizeof(x) * 8; const unsigned bits = sizeof(x) * 8;
unsigned count = bits;
if (x < 0) {
return 0;
}
for (i = bits; --i; ) { for (i = bits; --i; ) {
if (x < 0) break; if (x == 0) break;
count++; count--;
x <<= 1; x >>= 1;
} }
return count; return count;