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avfilter/vf_cropdetect: Unroll 3 & 4 bytes per sample loop

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19484 -> 10266 decicycles

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-30 02:35:32 +01:00
parent 60e2c3110a
commit 5c7227bbb3
1 changed files with 8 additions and 0 deletions
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8
libavfilter/vf_cropdetect.c
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@ -81,6 +81,14 @@ static int checkline(void *ctx, const unsigned char *src, int stride, int len, i
break;
case 3:
case 4:
while (len >= 4) {
total += src[0] + src[1 ] + src[2 ]
+ src[ stride] + src[1+ stride] + src[2+ stride];
+ src[2*stride] + src[1+2*stride] + src[2+2*stride];
+ src[3*stride] + src[1+3*stride] + src[2+3*stride];
src += 4*stride;
len -= 4;
}
while (--len >= 0) {
total += src[0] + src[1] + src[2];
src += stride;