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authorMichael Niedermayer <michael@niedermayer.cc>2019-01-17 22:35:10 +0100
committerMichael Niedermayer <michael@niedermayer.cc>2019-01-20 21:42:20 +0100
commit12b1338be376a3e5fb606d9fe41b58dc4a9e62c7 (patch)
treed464cabc298b2d6f4385986e6d227d0eb8353d76 /libavutil
parent32421602dfb18c58a9563b748c199955fc158abc (diff)
downloadffmpeg-12b1338be376a3e5fb606d9fe41b58dc4a9e62c7.tar.gz
avutil/mem: Optimize fill32() by unrolling and using 64bit
Reviewed-by: Marton Balint <cus@passwd.hu> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavutil')
-rw-r--r--libavutil/mem.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/libavutil/mem.c b/libavutil/mem.c
index 6149755a6b..88fe09b179 100644
--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -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;