videolan/ffmpeg
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* using unrolled loops seems to help to MMX Celerons

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* calculating average in parallel to use two MMX units
* disabled xy2 put code - it's producing rouding errors

Originally committed as revision 626 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Zdenek Kabelac 2002-05-29 20:00:10 +00:00
parent 6aa6ea8e11
commit ff9657069a
1 changed files with 19 additions and 32 deletions
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51
libavcodec/i386/dsputil_mmx_rnd.h
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@ -21,10 +21,6 @@
* and improved by Zdenek Kabelac <kabi@users.sf.net>
*/
// will have to be check if it's better to have bigger
// unrolled code also on Celerons - for now yes
#define LONG_UNROLL 1
// put_pixels
static void DEF(put, pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
@ -34,30 +30,24 @@ static void DEF(put, pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size
".balign 8 \n\t"
"1: \n\t"
"movq (%1), %%mm0 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1), %%mm1 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
PAVGB(%%mm0, %%mm1)
"movq %%mm6, (%2) \n\t"
PAVGB(%%mm2, %%mm3)
PAVGBP(%%mm0, %%mm1, %%mm5, %%mm2, %%mm3, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
#if LONG_UNROLL
"movq (%1), %%mm0 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1), %%mm1 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
PAVGB(%%mm0, %%mm1)
"movq %%mm6, (%2) \n\t"
PAVGB(%%mm2, %%mm3)
PAVGBP(%%mm0, %%mm1, %%mm5, %%mm2, %%mm3, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
"subl $4, %0 \n\t"
#else
"subl $2, %0 \n\t"
#endif
"jnz 1b \n\t"
:"+g"(h), "+S"(pixels), "+D"(block)
:"r"(line_size)
@ -74,25 +64,19 @@ static void DEF(put, pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size
"1: \n\t"
"movq (%1, %3), %%mm1 \n\t"
"movq (%1, %%eax),%%mm2 \n\t"
PAVGB(%%mm1, %%mm0)
"movq %%mm6, (%2) \n\t"
PAVGB(%%mm2, %%mm1)
"movq %%mm6, (%2, %3) \n\t"
PAVGBP(%%mm1, %%mm0, %%mm5, %%mm2, %%mm1, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
#ifdef LONG_UNROLL
"movq (%1, %3), %%mm1 \n\t"
"movq (%1, %%eax),%%mm0 \n\t"
PAVGB(%%mm1, %%mm2)
"movq %%mm6, (%2) \n\t"
PAVGB(%%mm0, %%mm1)
PAVGBP(%%mm1, %%mm2, %%mm5, %%mm0, %%mm1, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
"subl $4, %0 \n\t"
#else
"subl $2, %0 \n\t"
#endif
"jnz 1b \n\t"
:"+g"(h), "+S"(pixels), "+D"(block)
:"r"(line_size)
@ -101,7 +85,8 @@ static void DEF(put, pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size
// ((a + b)/2 + (c + d)/2)/2
// not sure if this is properly replacing original code
static void DEF(put, pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
// - ok it's really unsable at this moment -> disabled
static void DEF(put, disabled_pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
__asm __volatile(
MOVQ_BFE(%%mm7)
@ -113,15 +98,17 @@ static void DEF(put, pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_siz
"1: \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
PAVGBR(%%mm2, %%mm0, %%mm4)
PAVGBR(%%mm3, %%mm1, %%mm5)
PAVGBP(%%mm2, %%mm0, %%mm4, %%mm3, %%mm1, %%mm5)
//PAVGBR(%%mm2, %%mm0, %%mm4)
//PAVGBR(%%mm3, %%mm1, %%mm5)
PAVGB(%%mm4, %%mm5)
"movq %%mm6, (%2) \n\t"
"movq (%1, %%eax), %%mm0 \n\t"
"movq 1(%1, %%eax), %%mm1 \n\t"
PAVGBR(%%mm0, %%mm2, %%mm4)
PAVGBR(%%mm1, %%mm3, %%mm5)
PAVGBP(%%mm0, %%mm2, %%mm4, %%mm1, %%mm3, %%mm5)
//PAVGBR(%%mm0, %%mm2, %%mm4)
//PAVGBR(%%mm1, %%mm3, %%mm5)
PAVGB(%%mm4, %%mm5)
"movq %%mm6, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"