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pseudo-simd add_bytes and diff_bytes

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2x faster than scalar in 32bit, 4x faster in 64bit (as opposed to 8x in mmx)

Originally committed as revision 12165 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2008-02-21 07:54:46 +00:00
parent 4a9ca0a279
commit 469bd7b150
1 changed files with 20 additions and 13 deletions
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33
libavcodec/dsputil.c
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@ -50,6 +50,9 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
uint8_t ff_cropTbl[256 + 2 * MAX_NEG_CROP] = {0, };
uint32_t ff_squareTbl[512] = {0, };
static const unsigned long pb_7f = 0x7f7f7f7f7f7f7f7fUL;
static const unsigned long pb_80 = 0x8080808080808080UL;
const uint8_t ff_zigzag_direct[64] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
@ -3276,34 +3279,31 @@ static void clear_blocks_c(DCTELEM *blocks)
}
static void add_bytes_c(uint8_t *dst, uint8_t *src, int w){
int i;
for(i=0; i+7<w; i+=8){
dst[i+0] += src[i+0];
dst[i+1] += src[i+1];
dst[i+2] += src[i+2];
dst[i+3] += src[i+3];
dst[i+4] += src[i+4];
dst[i+5] += src[i+5];
dst[i+6] += src[i+6];
dst[i+7] += src[i+7];
long i;
for(i=0; i<=w-sizeof(long); i+=sizeof(long)){
long a = *(long*)(src+i);
long b = *(long*)(dst+i);
*(long*)(dst+i) = ((a&pb_7f) + (b&pb_7f)) ^ ((a^b)&pb_80);
}
for(; i<w; i++)
dst[i+0] += src[i+0];
}
static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
int i;
long i;
for(i=0; i<=w-sizeof(long); i+=sizeof(long)){
long a = *(long*)(src1+i);
long b = *(long*)(src2+i);
*(long*)(dst+i) = ((a&0x7f7f7f7f7f7f7f7fL) + (b&0x7f7f7f7f7f7f7f7fL)) ^ ((a^b)&0x8080808080808080L);
*(long*)(dst+i) = ((a&pb_7f) + (b&pb_7f)) ^ ((a^b)&pb_80);
}
for(; i<w; i++)
dst[i] = src1[i]+src2[i];
}
static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
int i;
long i;
#ifndef HAVE_FAST_UNALIGNED
if((long)src2 & (sizeof(long)-1)){
for(i=0; i+7<w; i+=8){
dst[i+0] = src1[i+0]-src2[i+0];
dst[i+1] = src1[i+1]-src2[i+1];
@ -3314,6 +3314,13 @@ static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
dst[i+6] = src1[i+6]-src2[i+6];
dst[i+7] = src1[i+7]-src2[i+7];
}
}else
#endif
for(i=0; i<=w-sizeof(long); i+=sizeof(long)){
long a = *(long*)(src1+i);
long b = *(long*)(src2+i);
*(long*)(dst+i) = ((a|pb_80) - (b&pb_7f)) ^ ((a^b^pb_80)&pb_80);
}
for(; i<w; i++)
dst[i+0] = src1[i+0]-src2[i+0];
}