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add the missing default BitsCtz() code

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Change-Id: Iff3ea946a380837b9dfad58350173b68b45e1347
This commit is contained in:
Skal 2021-02-19 16:10:20 +01:00 committed by Pascal Massimino
parent fae416179e
commit 0320e1e36f
1 changed files with 10 additions and 1 deletions
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11
src/utils/utils.h
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@ -107,10 +107,10 @@ static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
PutLE16(data + 2, (int)(val >> 16));
}
// Returns (int)floor(log2(n)). n must be > 0.
// use GNU builtins where available.
#if defined(__GNUC__) && \
((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
// Returns (int)floor(log2(n)). n must be > 0.
static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
return 31 ^ __builtin_clz(n);
}
@ -148,6 +148,15 @@ static WEBP_INLINE int WebPLog2FloorC(uint32_t n) {
}
static WEBP_INLINE int BitsLog2Floor(uint32_t n) { return WebPLog2FloorC(n); }
static WEBP_INLINE int BitsCtz(uint32_t n) {
int i;
for (i = 0; i < 32; ++i, n >>= 1) {
if (n & 1) return i;
}
return 32;
}
#endif
//------------------------------------------------------------------------------