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avutil/mem: Optimize fill32() by unrolling and using 64bit 

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 12b1338be3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-01-17 22:35:10 +01:00
parent 29d978c91e
commit cb6af7dfa1
1 changed files with 12 additions and 0 deletions
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12
libavutil/mem.c
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@ -399,6 +399,18 @@ static void fill32(uint8_t *dst, int len)
{
uint32_t v = AV_RN32(dst - 4);
#if HAVE_FAST_64BIT
uint64_t v2= v + ((uint64_t)v<<32);
while (len >= 32) {
AV_WN64(dst , v2);
AV_WN64(dst+ 8, v2);
AV_WN64(dst+16, v2);
AV_WN64(dst+24, v2);
dst += 32;
len -= 32;
}
#endif
while (len >= 4) {
AV_WN32(dst, v);
dst += 4;