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Code Issues Releases Activity

1.6x faster pred*_vertical_add_c

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Originally committed as revision 16202 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2008-12-18 01:05:06 +00:00
parent 621561cdf3
commit 00794ed0d9
1 changed files with 34 additions and 28 deletions
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62
libavcodec/h264pred.c
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@ -989,23 +989,26 @@ static void pred8x8l_horizontal_up_c(uint8_t *src, int has_topleft, int has_topr
static void pred4x4_vertical_add_c(uint8_t *pix, const DCTELEM *block, int stride){
int i;
pix -= stride;
for(i=0; i<4; i++){
pix[0]= pix[0-stride] + block[0];
pix[1]= pix[1-stride] + block[1];
pix[2]= pix[2-stride] + block[2];
pix[3]= pix[3-stride] + block[3];
pix+= stride;
block+= 4;
uint8_t v = pix[0];
pix[1*stride]= v += block[0];
pix[2*stride]= v += block[4];
pix[3*stride]= v += block[8];
pix[4*stride]= v += block[12];
pix++;
block++;
}
}
static void pred4x4_horizontal_add_c(uint8_t *pix, const DCTELEM *block, int stride){
int i;
for(i=0; i<4; i++){
pix[0]= pix[-1] + block[0];
pix[1]= pix[ 0] + block[1];
pix[2]= pix[ 1] + block[2];
pix[3]= pix[ 2] + block[3];
uint8_t v = pix[-1];
pix[0]= v += block[0];
pix[1]= v += block[1];
pix[2]= v += block[2];
pix[3]= v += block[3];
pix+= stride;
block+= 4;
}
@ -1013,31 +1016,34 @@ static void pred4x4_horizontal_add_c(uint8_t *pix, const DCTELEM *block, int str
static void pred8x8l_vertical_add_c(uint8_t *pix, const DCTELEM *block, int stride){
int i;
pix -= stride;
for(i=0; i<8; i++){
pix[0]= pix[0-stride] + block[0];
pix[1]= pix[1-stride] + block[1];
pix[2]= pix[2-stride] + block[2];
pix[3]= pix[3-stride] + block[3];
pix[4]= pix[4-stride] + block[4];
pix[5]= pix[5-stride] + block[5];
pix[6]= pix[6-stride] + block[6];
pix[7]= pix[7-stride] + block[7];
pix+= stride;
block+= 8;
uint8_t v = pix[0];
pix[1*stride]= v += block[0];
pix[2*stride]= v += block[8];
pix[3*stride]= v += block[16];
pix[4*stride]= v += block[24];
pix[5*stride]= v += block[32];
pix[6*stride]= v += block[40];
pix[7*stride]= v += block[48];
pix[8*stride]= v += block[56];
pix++;
block++;
}
}
static void pred8x8l_horizontal_add_c(uint8_t *pix, const DCTELEM *block, int stride){
int i;
for(i=0; i<8; i++){
pix[0]= pix[-1] + block[0];
pix[1]= pix[ 0] + block[1];
pix[2]= pix[ 1] + block[2];
pix[3]= pix[ 2] + block[3];
pix[4]= pix[ 3] + block[4];
pix[5]= pix[ 4] + block[5];
pix[6]= pix[ 5] + block[6];
pix[7]= pix[ 6] + block[7];
uint8_t v = pix[-1];
pix[0]= v += block[0];
pix[1]= v += block[1];
pix[2]= v += block[2];
pix[3]= v += block[3];
pix[4]= v += block[4];
pix[5]= v += block[5];
pix[6]= v += block[6];
pix[7]= v += block[7];
pix+= stride;
block+= 8;
}