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pngdsp x86: use unaligned access

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For test images manually generated to contain only up prediction,
timing results:
         8380x3032    255x185
before:   138635       1992
after:    139232       1996

Actually jumping to the proper version depending on the alignment:
8380x3032: 138767

A 0.5% speed improvement for gigantic images is not worth the code
duplication.

Fixes ticket #4148

Signed-off-by: Christophe Gisquet <christophe.gisquet@gmail.com>
Tested-by: Benoit Fouet <benoit.fouet@free.fr>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2014-12-02 14:31:49 +01:00 committed by Michael Niedermayer
parent 242f1152bf
commit 9fa056ba75
2 changed files with 8 additions and 8 deletions
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4
libavcodec/pngdsp.h
View File

@ -25,9 +25,9 @@
#include <stdint.h>
typedef struct PNGDSPContext {
void (*add_bytes_l2)(uint8_t *dst /* align 16 */,
void (*add_bytes_l2)(uint8_t *dst,
uint8_t *src1 /* align 16 */,
uint8_t *src2 /* align 16 */, int w);
uint8_t *src2, int w);
/* this might write to dst[w] */
void (*add_paeth_prediction)(uint8_t *dst, uint8_t *src,

12
libavcodec/x86/pngdsp.asm
View File

@ -42,12 +42,12 @@ cglobal add_bytes_l2, 4, 6, %1, dst, src1, src2, wa, w, i
and waq, ~(mmsize*2-1)
jmp .end_v
.loop_v:
mova m0, [src1q+iq]
mova m1, [src1q+iq+mmsize]
paddb m0, [src2q+iq]
paddb m1, [src2q+iq+mmsize]
mova [dstq+iq ], m0
mova [dstq+iq+mmsize], m1
movu m0, [src2q+iq]
movu m1, [src2q+iq+mmsize]
paddb m0, [src1q+iq]
paddb m1, [src1q+iq+mmsize]
movu [dstq+iq ], m0
movu [dstq+iq+mmsize], m1
add iq, mmsize*2
.end_v:
cmp iq, waq