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Improvements to ma_tzcnt32().

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This commit is contained in:
David Reid
2020-02-27 18:42:45 +10:00
parent 2be437ea33
commit e563b19e2b
1 changed files with 16 additions and 9 deletions
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miniaudio.h
+16 -9
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@@ -40949,20 +40949,27 @@ static MA_INLINE ma_uint64 ma_noise_read_pcm_frames__white(ma_noise* pNoise, voi
} }
/*
TODO: Optimize this:
x86/64: TZCNT
*/
static MA_INLINE unsigned int ma_tzcnt32(unsigned int x) static MA_INLINE unsigned int ma_tzcnt32(unsigned int x)
{ {
unsigned int i; unsigned int n;
i = 0; /* Special case for odd numbers since they should happen about half the time. */
while (((x >> i) & 0x1) == 0 && i < (sizeof(unsigned long) * 8)) { if (x & 0x1) {
i += 1; return 0;
} }
return i; if (x == 0) {
return sizeof(x) << 3;
}
n = 1;
if ((x & 0x0000FFFF) == 0) { x >>= 16; n += 16; }
if ((x & 0x000000FF) == 0) { x >>= 8; n += 8; }
if ((x & 0x0000000F) == 0) { x >>= 4; n += 4; }
if ((x & 0x00000003) == 0) { x >>= 2; n += 2; }
n -= x & 0x00000001;
return n;
} }
/* /*