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optimize the first vertical lifting step, this also prevents another

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overflow, the last known possible overflow

Originally committed as revision 10234 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 18 years ago
parent 7e7f5c7bf6
commit cefa599953
1 changed files with 25 additions and 25 deletions
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  1. 50
      libavcodec/i386/snowdsp_mmx.c

50
libavcodec/i386/snowdsp_mmx.c
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@ -424,6 +424,12 @@ void ff_snow_horizontal_compose97i_mmx(IDWTELEM *b, int width){
"paddw %%"s2", %%"t2" \n\t"\
"paddw %%"s3", %%"t3" \n\t"
#define snow_vertical_compose_r2r_pmulhw(s0,s1,s2,s3,t0,t1,t2,t3)\
"pmulhw %%"s0", %%"t0" \n\t"\
"pmulhw %%"s1", %%"t1" \n\t"\
"pmulhw %%"s2", %%"t2" \n\t"\
"pmulhw %%"s3", %%"t3" \n\t"
#define snow_vertical_compose_sse2_move(s0,s1,s2,s3,t0,t1,t2,t3)\
"movdqa %%"s0", %%"t0" \n\t"\
"movdqa %%"s1", %%"t1" \n\t"\
@ -446,21 +452,18 @@ void ff_snow_vertical_compose97i_sse2(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
asm volatile (
"jmp 2f \n\t"
"1: \n\t"
snow_vertical_compose_sse2_load("%4","xmm0","xmm2","xmm4","xmm6")
snow_vertical_compose_sse2_add("%6","xmm0","xmm2","xmm4","xmm6")
snow_vertical_compose_sse2_move("xmm0","xmm2","xmm4","xmm6","xmm1","xmm3","xmm5","xmm7")
snow_vertical_compose_sra("1","xmm0","xmm2","xmm4","xmm6")
snow_vertical_compose_r2r_add("xmm1","xmm3","xmm5","xmm7","xmm0","xmm2","xmm4","xmm6")
"pcmpeqd %%xmm1, %%xmm1 \n\t"
"psllw $15, %%xmm1 \n\t"
"psrlw $14, %%xmm1 \n\t"
snow_vertical_compose_r2r_add("xmm1","xmm1","xmm1","xmm1","xmm0","xmm2","xmm4","xmm6")
snow_vertical_compose_sra("2","xmm0","xmm2","xmm4","xmm6")
snow_vertical_compose_sse2_load("%5","xmm1","xmm3","xmm5","xmm7")
snow_vertical_compose_r2r_sub("xmm0","xmm2","xmm4","xmm6","xmm1","xmm3","xmm5","xmm7")
"pcmpeqw %%xmm0, %%xmm0 \n\t"
"pcmpeqw %%xmm2, %%xmm2 \n\t"
"paddw %%xmm2, %%xmm2 \n\t"
"paddw %%xmm0, %%xmm2 \n\t"
"psllw $13, %%xmm2 \n\t"
snow_vertical_compose_r2r_add("xmm0","xmm0","xmm0","xmm0","xmm1","xmm3","xmm5","xmm7")
snow_vertical_compose_r2r_pmulhw("xmm2","xmm2","xmm2","xmm2","xmm1","xmm3","xmm5","xmm7")
snow_vertical_compose_sse2_add("%5","xmm1","xmm3","xmm5","xmm7")
snow_vertical_compose_sse2_store("%5","xmm1","xmm3","xmm5","xmm7")
snow_vertical_compose_sse2_load("%4","xmm0","xmm2","xmm4","xmm6")
snow_vertical_compose_sse2_add("%3","xmm1","xmm3","xmm5","xmm7")
@ -530,6 +533,7 @@ void ff_snow_vertical_compose97i_sse2(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
"movq %%"s2", %%"t2" \n\t"\
"movq %%"s3", %%"t3" \n\t"
void ff_snow_vertical_compose97i_mmx(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, IDWTELEM *b3, IDWTELEM *b4, IDWTELEM *b5, int width){
long i = width;
while(i & 15)
@ -545,20 +549,16 @@ void ff_snow_vertical_compose97i_mmx(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, I
"jmp 2f \n\t"
"1: \n\t"
snow_vertical_compose_mmx_load("%4","mm0","mm2","mm4","mm6")
snow_vertical_compose_mmx_add("%6","mm0","mm2","mm4","mm6")
snow_vertical_compose_mmx_move("mm0","mm2","mm4","mm6","mm1","mm3","mm5","mm7")
snow_vertical_compose_sra("1","mm0","mm2","mm4","mm6")
snow_vertical_compose_r2r_add("mm1","mm3","mm5","mm7","mm0","mm2","mm4","mm6")
"pcmpeqw %%mm1, %%mm1 \n\t"
"psllw $15, %%mm1 \n\t"
"psrlw $14, %%mm1 \n\t"
snow_vertical_compose_r2r_add("mm1","mm1","mm1","mm1","mm0","mm2","mm4","mm6")
snow_vertical_compose_sra("2","mm0","mm2","mm4","mm6")
snow_vertical_compose_mmx_load("%5","mm1","mm3","mm5","mm7")
snow_vertical_compose_r2r_sub("mm0","mm2","mm4","mm6","mm1","mm3","mm5","mm7")
snow_vertical_compose_mmx_load("%4","mm1","mm3","mm5","mm7")
snow_vertical_compose_mmx_add("%6","mm1","mm3","mm5","mm7")
"pcmpeqw %%mm0, %%mm0 \n\t"
"pcmpeqw %%mm2, %%mm2 \n\t"
"paddw %%mm2, %%mm2 \n\t"
"paddw %%mm0, %%mm2 \n\t"
"psllw $13, %%mm2 \n\t"
snow_vertical_compose_r2r_add("mm0","mm0","mm0","mm0","mm1","mm3","mm5","mm7")
snow_vertical_compose_r2r_pmulhw("mm2","mm2","mm2","mm2","mm1","mm3","mm5","mm7")
snow_vertical_compose_mmx_add("%5","mm1","mm3","mm5","mm7")
snow_vertical_compose_mmx_store("%5","mm1","mm3","mm5","mm7")
snow_vertical_compose_mmx_load("%4","mm0","mm2","mm4","mm6")
snow_vertical_compose_mmx_add("%3","mm1","mm3","mm5","mm7")

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