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Statements like a = b = c = d = e; store from right-to-left, so if 

you write them in the right order it comes out backwards.
This removes them from fill_rectangle().
patch by Alexander Strange %astrange A ithinksw P com%
Original thread:
Date: Aug 14, 2007 5:36 AM
Subject: [FFmpeg-devel] [PATCH] two small h264 optimizations

Originally committed as revision 10118 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alexander Strange 2007-08-14 22:28:09 +00:00 committed by Guillaume Poirier
parent 77cb22fa7b
commit 6d324c813f
1 changed files with 28 additions and 28 deletions
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56
libavcodec/h264.c
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@ -91,7 +91,7 @@ static av_always_inline void fill_rectangle(void *vp, int w, int h, int stride,
if(h==1) return;
*(uint16_t*)(p + 1*stride)= v;
if(h==2) return;
*(uint16_t*)(p + 2*stride)=
*(uint16_t*)(p + 2*stride)= v;
*(uint16_t*)(p + 3*stride)= v;
}else if(w==4){
const uint32_t v= size==4 ? val : val*0x01010101;
@ -99,7 +99,7 @@ static av_always_inline void fill_rectangle(void *vp, int w, int h, int stride,
if(h==1) return;
*(uint32_t*)(p + 1*stride)= v;
if(h==2) return;
*(uint32_t*)(p + 2*stride)=
*(uint32_t*)(p + 2*stride)= v;
*(uint32_t*)(p + 3*stride)= v;
}else if(w==8){
//gcc can't optimize 64bit math on x86_32
@ -109,47 +109,47 @@ static av_always_inline void fill_rectangle(void *vp, int w, int h, int stride,
if(h==1) return;
*(uint64_t*)(p + 1*stride)= v;
if(h==2) return;
*(uint64_t*)(p + 2*stride)=
*(uint64_t*)(p + 2*stride)= v;
*(uint64_t*)(p + 3*stride)= v;
}else if(w==16){
const uint64_t v= val*0x0100000001ULL;
*(uint64_t*)(p + 0+0*stride)=
*(uint64_t*)(p + 8+0*stride)=
*(uint64_t*)(p + 0+1*stride)=
*(uint64_t*)(p + 0+0*stride)= v;
*(uint64_t*)(p + 8+0*stride)= v;
*(uint64_t*)(p + 0+1*stride)= v;
*(uint64_t*)(p + 8+1*stride)= v;
if(h==2) return;
*(uint64_t*)(p + 0+2*stride)=
*(uint64_t*)(p + 8+2*stride)=
*(uint64_t*)(p + 0+3*stride)=
*(uint64_t*)(p + 0+2*stride)= v;
*(uint64_t*)(p + 8+2*stride)= v;
*(uint64_t*)(p + 0+3*stride)= v;
*(uint64_t*)(p + 8+3*stride)= v;
#else
*(uint32_t*)(p + 0+0*stride)=
*(uint32_t*)(p + 0+0*stride)= val;
*(uint32_t*)(p + 4+0*stride)= val;
if(h==1) return;
*(uint32_t*)(p + 0+1*stride)=
*(uint32_t*)(p + 0+1*stride)= val;
*(uint32_t*)(p + 4+1*stride)= val;
if(h==2) return;
*(uint32_t*)(p + 0+2*stride)=
*(uint32_t*)(p + 4+2*stride)=
*(uint32_t*)(p + 0+3*stride)=
*(uint32_t*)(p + 0+2*stride)= val;
*(uint32_t*)(p + 4+2*stride)= val;
*(uint32_t*)(p + 0+3*stride)= val;
*(uint32_t*)(p + 4+3*stride)= val;
}else if(w==16){
*(uint32_t*)(p + 0+0*stride)=
*(uint32_t*)(p + 4+0*stride)=
*(uint32_t*)(p + 8+0*stride)=
*(uint32_t*)(p +12+0*stride)=
*(uint32_t*)(p + 0+1*stride)=
*(uint32_t*)(p + 4+1*stride)=
*(uint32_t*)(p + 8+1*stride)=
*(uint32_t*)(p + 0+0*stride)= val;
*(uint32_t*)(p + 4+0*stride)= val;
*(uint32_t*)(p + 8+0*stride)= val;
*(uint32_t*)(p +12+0*stride)= val;
*(uint32_t*)(p + 0+1*stride)= val;
*(uint32_t*)(p + 4+1*stride)= val;
*(uint32_t*)(p + 8+1*stride)= val;
*(uint32_t*)(p +12+1*stride)= val;
if(h==2) return;
*(uint32_t*)(p + 0+2*stride)=
*(uint32_t*)(p + 4+2*stride)=
*(uint32_t*)(p + 8+2*stride)=
*(uint32_t*)(p +12+2*stride)=
*(uint32_t*)(p + 0+3*stride)=
*(uint32_t*)(p + 4+3*stride)=
*(uint32_t*)(p + 8+3*stride)=
*(uint32_t*)(p + 0+2*stride)= val;
*(uint32_t*)(p + 4+2*stride)= val;
*(uint32_t*)(p + 8+2*stride)= val;
*(uint32_t*)(p +12+2*stride)= val;
*(uint32_t*)(p + 0+3*stride)= val;
*(uint32_t*)(p + 4+3*stride)= val;
*(uint32_t*)(p + 8+3*stride)= val;
*(uint32_t*)(p +12+3*stride)= val;
#endif
}else