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* removed MANGLE from macros for setting constants 

* using MOVQ_WONE/MOVQ_BFE as two instruction instead of static memory value access
  as its always faster
* PAVGB_MMX macro is using now mm6 -> mm7 is unmodified
* replaced original pixels_xy2_mmx with new faster and equal implementation
* replaced usage of mm7 for other then ZERO contstant in _rnd & _avg file with mm6

Originally committed as revision 632 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Zdenek Kabelac 23 years ago
parent
4e33b83b18
commit
fca0f0e59f
3 changed files with 112 additions and 189 deletions
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  1. +32
    -135
      libavcodec/i386/dsputil_mmx.c
  2. +10
    -10
      libavcodec/i386/dsputil_mmx_avg.h
  3. +70
    -44
      libavcodec/i386/dsputil_mmx_rnd.h

+ 32
- 135
libavcodec/i386/dsputil_mmx.c View File

@@ -49,53 +49,51 @@ void ff_mmx_idct(DCTELEM *block);
void ff_mmxext_idct(DCTELEM *block);

/* pixel operations */
static const uint64_t mm_bfe __attribute__ ((aligned(8))) = 0xfefefefefefefefeULL;
static const uint64_t mm_bone __attribute__ ((aligned(8))) = 0x0101010101010101ULL;
static const uint64_t mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001ULL;
static const uint64_t mm_wtwo __attribute__ ((aligned(8))) = 0x0002000200020002ULL;
//static const unsigned short mm_wone[4] __attribute__ ((aligned(8))) = { 0x1, 0x1, 0x1, 0x1 };
//static const unsigned short mm_wtwo[4] __attribute__ ((aligned(8))) = { 0x2, 0x2, 0x2, 0x2 };

#define JUMPALIGN() __asm __volatile (".balign 8"::)
#define MOVQ_ZERO(regd) __asm __volatile ("pxor %%" #regd ", %%" #regd ::)

#define MOVQ_WONE(regd) \
__asm __volatile ( \
"pcmpeqd %%" #regd ", %%" #regd " \n\t" \
"psrlw $15, %%" #regd ::)

#define MOVQ_BFE(regd) \
__asm __volatile ( \
"pcmpeqd %%" #regd ", %%" #regd " \n\t"\
"paddb %%" #regd ", %%" #regd " \n\t" ::)

#ifndef PIC
#define MOVQ_WONE(regd) __asm __volatile ("movq %0, %%" #regd " \n\t" ::"m"(mm_wone))
#define MOVQ_BONE(regd) __asm __volatile ("movq %0, %%" #regd " \n\t" ::"m"(mm_bone))
#define MOVQ_WTWO(regd) __asm __volatile ("movq %0, %%" #regd " \n\t" ::"m"(mm_wtwo))
#define MOVQ_BONE(regd) "movq "MANGLE(mm_bone)", "#regd" \n\t"
#define MOVQ_BFE(regd) "movq "MANGLE(mm_bfe)", "#regd" \n\t"
#else
// for shared library it's better to use this way for accessing constants
// pcmpeqd -> -1
#define MOVQ_WONE(regd) \
#define MOVQ_BONE(regd) \
__asm __volatile ( \
"pcmpeqd %%" #regd ", %%" #regd " \n\t" \
"psrlw $15, %%" #regd ::)
"pcmpeqd %%" #regd ", %%" #regd " \n\t" \
"psrlw $15, %%" #regd " \n\t" \
"packuswb %%" #regd ", %%" #regd " \n\t" ::)

#define MOVQ_WTWO(regd) \
__asm __volatile ( \
"pcmpeqd %%" #regd ", %%" #regd " \n\t" \
"psrlw $15, %%" #regd " \n\t" \
"psllw $1, %%" #regd ::)

#define MOVQ_BONE(regd) \
"pcmpeqd " #regd ", " #regd " \n\t" \
"psrlw $15, " #regd " \n\t"\
"packuswb " #regd ", " #regd " \n\t"
"pcmpeqd %%" #regd ", %%" #regd " \n\t" \
"psrlw $15, %%" #regd " \n\t" \
"psllw $1, %%" #regd " \n\t"::)

#define MOVQ_BFE(regd) \
"pcmpeqd " #regd ", " #regd " \n\t"\
"paddb " #regd ", " #regd " \n\t"
#endif

// using mm6 as temporary and for the output result
// using regr as temporary and for the output result
// first argument is unmodifed and second is trashed
// mm7 is supposed to contain 0xfefefefefefefefe
// mm6 is supposed to contain 0xfefefefefefefefe
#define PAVGB_MMX_NO_RND(rega, regb, regr) \
"movq " #rega ", " #regr " \n\t"\
"pand " #regb ", " #regr " \n\t"\
"pxor " #rega ", " #regb " \n\t"\
"pand %%mm7, " #regb " \n\t"\
"pand %%mm6, " #regb " \n\t"\
"psrlq $1, " #regb " \n\t"\
"paddb " #regb ", " #regr " \n\t"

@@ -103,7 +101,7 @@ static const uint64_t mm_wtwo __attribute__ ((aligned(8))) = 0x0002000200020002U
"movq " #rega ", " #regr " \n\t"\
"por " #regb ", " #regr " \n\t"\
"pxor " #rega ", " #regb " \n\t"\
"pand %%mm7, " #regb " \n\t"\
"pand %%mm6, " #regb " \n\t"\
"psrlq $1, " #regb " \n\t"\
"psubb " #regb ", " #regr " \n\t"

@@ -114,8 +112,8 @@ static const uint64_t mm_wtwo __attribute__ ((aligned(8))) = 0x0002000200020002U
"pand " #regd ", " #regp " \n\t"\
"pxor " #rega ", " #regb " \n\t"\
"pxor " #regc ", " #regd " \n\t"\
"pand %%mm7, " #regb " \n\t"\
"pand %%mm7, " #regd " \n\t"\
"pand %%mm6, " #regb " \n\t"\
"pand %%mm6, " #regd " \n\t"\
"psrlq $1, " #regb " \n\t"\
"psrlq $1, " #regd " \n\t"\
"paddb " #regb ", " #regr " \n\t"\
@@ -128,8 +126,8 @@ static const uint64_t mm_wtwo __attribute__ ((aligned(8))) = 0x0002000200020002U
"por " #regd ", " #regp " \n\t"\
"pxor " #rega ", " #regb " \n\t"\
"pxor " #regc ", " #regd " \n\t"\
"pand %%mm7, " #regb " \n\t"\
"pand %%mm7, " #regd " \n\t"\
"pand %%mm6, " #regb " \n\t"\
"pand %%mm6, " #regd " \n\t"\
"psrlq $1, " #regd " \n\t"\
"psrlq $1, " #regb " \n\t"\
"psubb " #regb ", " #regr " \n\t"\
@@ -138,29 +136,25 @@ static const uint64_t mm_wtwo __attribute__ ((aligned(8))) = 0x0002000200020002U
/***********************************/
/* MMX no rounding */
#define DEF(x, y) x ## _no_rnd_ ## y ##_mmx

#define PAVGB(a, b) PAVGB_MMX_NO_RND(a, b, %%mm6)
#define PAVGBR(a, b, c) PAVGB_MMX_NO_RND(a, b, c)
#define SET_RND MOVQ_WONE
#define PAVGBP(a, b, c, d, e, f) PAVGBP_MMX_NO_RND(a, b, c, d, e, f)

#include "dsputil_mmx_rnd.h"

#undef DEF
#undef PAVGB
#undef PAVGBR
#undef SET_RND
#undef PAVGBP
/***********************************/
/* MMX rounding */

#define DEF(x, y) x ## _ ## y ##_mmx

#define PAVGB(a, b) PAVGB_MMX(a, b, %%mm6)
#define PAVGBR(a, b, c) PAVGB_MMX(a, b, c)
#define SET_RND MOVQ_WTWO
#define PAVGBP(a, b, c, d, e, f) PAVGBP_MMX(a, b, c, d, e, f)

#include "dsputil_mmx_rnd.h"

#undef DEF
#undef PAVGB
#undef PAVGBR
#undef SET_RND
#undef PAVGBP

/***********************************/
@@ -371,103 +365,6 @@ static void put_pixels_mmx(UINT8 *block, const UINT8 *pixels, int line_size, int
);
}

#if 1
static void put_pixels_xy2_mmx(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
UINT8 *p;
const UINT8 *pix;
p = block;
pix = pixels; // 1s
MOVQ_ZERO(mm7);
MOVQ_WTWO(mm6);
JUMPALIGN();
do {
__asm __volatile(
"movq %1, %%mm0\n\t"
"movq %2, %%mm1\n\t"
"movq 1%1, %%mm4\n\t"
"movq 1%2, %%mm5\n\t"
"movq %%mm0, %%mm2\n\t"
"movq %%mm1, %%mm3\n\t"
"punpcklbw %%mm7, %%mm0\n\t"
"punpcklbw %%mm7, %%mm1\n\t"
"punpckhbw %%mm7, %%mm2\n\t"
"punpckhbw %%mm7, %%mm3\n\t"
"paddusw %%mm1, %%mm0\n\t"
"paddusw %%mm3, %%mm2\n\t"
"movq %%mm4, %%mm1\n\t"
"movq %%mm5, %%mm3\n\t"
"punpcklbw %%mm7, %%mm4\n\t"
"punpcklbw %%mm7, %%mm5\n\t"
"punpckhbw %%mm7, %%mm1\n\t"
"punpckhbw %%mm7, %%mm3\n\t"
"paddusw %%mm5, %%mm4\n\t"
"paddusw %%mm3, %%mm1\n\t"
"paddusw %%mm6, %%mm4\n\t"
"paddusw %%mm6, %%mm1\n\t"
"paddusw %%mm4, %%mm0\n\t"
"paddusw %%mm1, %%mm2\n\t"
"psrlw $2, %%mm0\n\t"
"psrlw $2, %%mm2\n\t"
"packuswb %%mm2, %%mm0\n\t"
"movq %%mm0, %0\n\t"
:"=m"(*p)
:"m"(*pix),
"m"(*(pix+line_size))
:"memory");
pix += line_size;
p += line_size;
} while(--h);
}

static void put_no_rnd_pixels_xy2_mmx( UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
UINT8 *p;
const UINT8 *pix;
p = block;
pix = pixels;
MOVQ_ZERO(mm7);
MOVQ_WONE(mm6);
JUMPALIGN();
do {
__asm __volatile(
"movq %1, %%mm0\n\t"
"movq %2, %%mm1\n\t"
"movq 1%1, %%mm4\n\t"
"movq 1%2, %%mm5\n\t"
"movq %%mm0, %%mm2\n\t"
"movq %%mm1, %%mm3\n\t"
"punpcklbw %%mm7, %%mm0\n\t"
"punpcklbw %%mm7, %%mm1\n\t"
"punpckhbw %%mm7, %%mm2\n\t"
"punpckhbw %%mm7, %%mm3\n\t"
"paddusw %%mm1, %%mm0\n\t"
"paddusw %%mm3, %%mm2\n\t"
"movq %%mm4, %%mm1\n\t"
"movq %%mm5, %%mm3\n\t"
"punpcklbw %%mm7, %%mm4\n\t"
"punpcklbw %%mm7, %%mm5\n\t"
"punpckhbw %%mm7, %%mm1\n\t"
"punpckhbw %%mm7, %%mm3\n\t"
"paddusw %%mm5, %%mm4\n\t"
"paddusw %%mm3, %%mm1\n\t"
"paddusw %%mm6, %%mm4\n\t"
"paddusw %%mm6, %%mm1\n\t"
"paddusw %%mm4, %%mm0\n\t"
"paddusw %%mm1, %%mm2\n\t"
"psrlw $2, %%mm0\n\t"
"psrlw $2, %%mm2\n\t"
"packuswb %%mm2, %%mm0\n\t"
"movq %%mm0, %0\n\t"
:"=m"(*p)
:"m"(*pix),
"m"(*(pix+line_size))
:"memory");
pix += line_size;
p += line_size;
} while(--h);
}
#endif
static void avg_pixels_mmx(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
UINT8 *p;


+ 10
- 10
libavcodec/i386/dsputil_mmx_avg.h View File

@@ -56,17 +56,17 @@ static void DEF(put_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size,
/* GL: this function does incorrect rounding if overflow */
static void DEF(put_no_rnd_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
MOVQ_BONE(mm6);
__asm __volatile(
"lea (%3, %3), %%eax \n\t"
MOVQ_BONE(%%mm7)
"1: \n\t"
"movq (%1), %%mm0 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1), %%mm1 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
"addl %%eax, %1 \n\t"
"psubusb %%mm7, %%mm0 \n\t"
"psubusb %%mm7, %%mm2 \n\t"
"psubusb %%mm6, %%mm0 \n\t"
"psubusb %%mm6, %%mm2 \n\t"
PAVGB" %%mm1, %%mm0 \n\t"
PAVGB" %%mm3, %%mm2 \n\t"
"movq %%mm0, (%2) \n\t"
@@ -77,8 +77,8 @@ static void DEF(put_no_rnd_pixels_x2)(UINT8 *block, const UINT8 *pixels, int lin
"movq 1(%1, %3), %%mm3 \n\t"
"addl %%eax, %2 \n\t"
"addl %%eax, %1 \n\t"
"psubusb %%mm7, %%mm0 \n\t"
"psubusb %%mm7, %%mm2 \n\t"
"psubusb %%mm6, %%mm0 \n\t"
"psubusb %%mm6, %%mm2 \n\t"
PAVGB" %%mm1, %%mm0 \n\t"
PAVGB" %%mm3, %%mm2 \n\t"
"movq %%mm0, (%2) \n\t"
@@ -124,8 +124,8 @@ static void DEF(put_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size,
/* GL: this function does incorrect rounding if overflow */
static void DEF(put_no_rnd_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
MOVQ_BONE(mm6);
__asm __volatile(
MOVQ_BONE(%%mm7)
"lea (%3, %3), %%eax \n\t"
"movq (%1), %%mm0 \n\t"
"subl %3, %2 \n\t"
@@ -133,7 +133,7 @@ static void DEF(put_no_rnd_pixels_y2)(UINT8 *block, const UINT8 *pixels, int lin
"movq (%1, %3), %%mm1 \n\t"
"movq (%1, %%eax), %%mm2 \n\t"
"addl %%eax, %1 \n\t"
"psubusb %%mm7, %%mm1 \n\t"
"psubusb %%mm6, %%mm1 \n\t"
PAVGB" %%mm1, %%mm0 \n\t"
PAVGB" %%mm2, %%mm1 \n\t"
"movq %%mm0, (%2, %3) \n\t"
@@ -142,7 +142,7 @@ static void DEF(put_no_rnd_pixels_y2)(UINT8 *block, const UINT8 *pixels, int lin
"movq (%1, %%eax), %%mm0 \n\t"
"addl %%eax, %2 \n\t"
"addl %%eax, %1 \n\t"
"psubusb %%mm7, %%mm1 \n\t"
"psubusb %%mm6, %%mm1 \n\t"
PAVGB" %%mm1, %%mm2 \n\t"
PAVGB" %%mm0, %%mm1 \n\t"
"movq %%mm2, (%2, %3) \n\t"
@@ -256,8 +256,8 @@ static void DEF(avg_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size,
// Note this is not correctly rounded, but this function is only used for b frames so it doesnt matter
static void DEF(avg_pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
MOVQ_BONE(mm6);
__asm __volatile(
MOVQ_BONE(%%mm7)
"lea (%3, %3), %%eax \n\t"
"movq (%1), %%mm0 \n\t"
PAVGB" 1(%1), %%mm0 \n\t"
@@ -265,7 +265,7 @@ static void DEF(avg_pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_size
"1: \n\t"
"movq (%1, %%eax), %%mm2 \n\t"
"movq (%1, %3), %%mm1 \n\t"
"psubusb %%mm7, %%mm2 \n\t"
"psubusb %%mm6, %%mm2 \n\t"
PAVGB" 1(%1, %3), %%mm1 \n\t"
PAVGB" 1(%1, %%eax), %%mm2 \n\t"
"addl %%eax, %1 \n\t"


+ 70
- 44
libavcodec/i386/dsputil_mmx_rnd.h View File

@@ -24,8 +24,8 @@
// put_pixels
static void DEF(put, pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
MOVQ_BFE(mm6);
__asm __volatile(
MOVQ_BFE(%%mm7)
"lea (%3, %3), %%eax \n\t"
".balign 8 \n\t"
"1: \n\t"
@@ -33,18 +33,18 @@ static void DEF(put, pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size
"movq 1(%1), %%mm1 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
PAVGBP(%%mm0, %%mm1, %%mm5, %%mm2, %%mm3, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
PAVGBP(%%mm0, %%mm1, %%mm4, %%mm2, %%mm3, %%mm5)
"movq %%mm4, (%2) \n\t"
"movq %%mm5, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
"movq (%1), %%mm0 \n\t"
"movq 1(%1), %%mm1 \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
PAVGBP(%%mm0, %%mm1, %%mm5, %%mm2, %%mm3, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
PAVGBP(%%mm0, %%mm1, %%mm4, %%mm2, %%mm3, %%mm5)
"movq %%mm4, (%2) \n\t"
"movq %%mm5, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
"subl $4, %0 \n\t"
@@ -56,24 +56,24 @@ static void DEF(put, pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size

static void DEF(put, pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
__asm __volatile(
MOVQ_BFE(%%mm7)
MOVQ_BFE(mm6);
__asm __volatile(
"lea (%3, %3), %%eax \n\t"
"movq (%1), %%mm0 \n\t"
".balign 8 \n\t"
"1: \n\t"
"movq (%1, %3), %%mm1 \n\t"
"movq (%1, %%eax),%%mm2 \n\t"
PAVGBP(%%mm1, %%mm0, %%mm5, %%mm2, %%mm1, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
PAVGBP(%%mm1, %%mm0, %%mm4, %%mm2, %%mm1, %%mm5)
"movq %%mm4, (%2) \n\t"
"movq %%mm5, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
"movq (%1, %3), %%mm1 \n\t"
"movq (%1, %%eax),%%mm0 \n\t"
PAVGBP(%%mm1, %%mm2, %%mm5, %%mm0, %%mm1, %%mm6)
"movq %%mm5, (%2) \n\t"
"movq %%mm6, (%2, %3) \n\t"
PAVGBP(%%mm1, %%mm2, %%mm4, %%mm0, %%mm1, %%mm5)
"movq %%mm4, (%2) \n\t"
"movq %%mm5, (%2, %3) \n\t"
"addl %%eax, %1 \n\t"
"addl %%eax, %2 \n\t"
"subl $4, %0 \n\t"
@@ -83,44 +83,70 @@ static void DEF(put, pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size
:"eax", "memory");
}

// ((a + b)/2 + (c + d)/2)/2
// not sure if this is properly replacing original code
// - 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)
static void DEF(put, pixels_xy2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
MOVQ_ZERO(mm7);
SET_RND(mm6); // =2 for rnd and =1 for no_rnd version
__asm __volatile(
MOVQ_BFE(%%mm7)
"lea (%3, %3), %%eax \n\t"
"movq (%1), %%mm0 \n\t"
"movq (%1), %%mm0 \n\t"
"movq 1(%1), %%mm1 \n\t"
".balign 8 \n\t"
"movq 1(%1), %%mm4 \n\t"
"movq %%mm0, %%mm1 \n\t"
"movq %%mm4, %%mm5 \n\t"
"punpcklbw %%mm7, %%mm0 \n\t"
"punpcklbw %%mm7, %%mm4 \n\t"
"punpckhbw %%mm7, %%mm1 \n\t"
"punpckhbw %%mm7, %%mm5 \n\t"
"paddusw %%mm0, %%mm4 \n\t"
"paddusw %%mm1, %%mm5 \n\t"
"xorl %%eax, %%eax \n\t"
"addl %3, %1 \n\t"
".balign 4 \n\t"
"1: \n\t"
"movq (%1, %3), %%mm2 \n\t"
"movq 1(%1, %3), %%mm3 \n\t"
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"
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"
"addl %%eax, %2 \n\t"
"movq 1(%1, %%eax), %%mm2 \n\t"
"movq %%mm0, %%mm1 \n\t"
"movq %%mm2, %%mm3 \n\t"
"punpcklbw %%mm7, %%mm0 \n\t"
"punpcklbw %%mm7, %%mm2 \n\t"
"punpckhbw %%mm7, %%mm1 \n\t"
"punpckhbw %%mm7, %%mm3 \n\t"
"paddusw %%mm2, %%mm0 \n\t"
"paddusw %%mm3, %%mm1 \n\t"
"paddusw %%mm6, %%mm4 \n\t"
"paddusw %%mm6, %%mm5 \n\t"
"paddusw %%mm0, %%mm4 \n\t"
"paddusw %%mm1, %%mm5 \n\t"
"psrlw $2, %%mm4 \n\t"
"psrlw $2, %%mm5 \n\t"
"packuswb %%mm5, %%mm4 \n\t"
"movq %%mm4, (%2, %%eax) \n\t"
"addl %3, %%eax \n\t"

"subl $2, %0 \n\t"
"movq (%1, %%eax), %%mm2 \n\t" // 0 <-> 2 1 <-> 3
"movq 1(%1, %%eax), %%mm4 \n\t"
"movq %%mm2, %%mm3 \n\t"
"movq %%mm4, %%mm5 \n\t"
"punpcklbw %%mm7, %%mm2 \n\t"
"punpcklbw %%mm7, %%mm4 \n\t"
"punpckhbw %%mm7, %%mm3 \n\t"
"punpckhbw %%mm7, %%mm5 \n\t"
"paddusw %%mm2, %%mm4 \n\t"
"paddusw %%mm3, %%mm5 \n\t"
"paddusw %%mm6, %%mm0 \n\t"
"paddusw %%mm6, %%mm1 \n\t"
"paddusw %%mm4, %%mm0 \n\t"
"paddusw %%mm5, %%mm1 \n\t"
"psrlw $2, %%mm0 \n\t"
"psrlw $2, %%mm1 \n\t"
"packuswb %%mm1, %%mm0 \n\t"
"movq %%mm0, (%2, %%eax) \n\t"
"addl %3, %%eax \n\t"

"subl $2, %0 \n\t"
"jnz 1b \n\t"
:"+g"(h), "+S"(pixels), "+D"(block)
:"r"(line_size)
:"+g"(h), "+S"(pixels)
:"D"(block), "r"(line_size)
:"eax", "memory");
}

// avg_pixels


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