FFmpeg/libavcodec/i386/dsputil_mmx_rnd.h

/*
 * DSP utils mmx functions are compiled twice for rnd/no_rnd
 * Copyright (c) 2000, 2001 Fabrice Bellard.
 * Copyright (c) 2003-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * MMX optimization by Nick Kurshev <nickols_k@mail.ru>
 * mostly rewritten by Michael Niedermayer <michaelni@gmx.at>
 * and improved by Zdenek Kabelac <kabi@users.sf.net>
 */

// put_pixels
static void DEF(put, pixels8_x2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_BFE(mm6);
    __asm __volatile(
	"lea	(%3, %3), %%eax		\n\t"
	".balign 8			\n\t"
	"1:				\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, %%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, %%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"
	"jnz	1b			\n\t"
	:"+g"(h), "+S"(pixels), "+D"(block)
	:"r"(line_size)
	:"eax", "memory");
}

static void DEF(put, pixels8_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int dstStride, int src1Stride, int h)
{
    MOVQ_BFE(mm6);
    __asm __volatile(
	"testl $1, %0			\n\t"
        " jz 1f				\n\t"
	"movq	(%1), %%mm0		\n\t"
	"movq	(%2), %%mm1		\n\t"
	"addl	%4, %1			\n\t"
        "addl	$8, %2			\n\t"
	PAVGB(%%mm0, %%mm1, %%mm4, %%mm6)
	"movq	%%mm4, (%3)		\n\t"
	"addl	%5, %3			\n\t"
        "decl	%0			\n\t"
	".balign 8			\n\t"
	"1:				\n\t"
	"movq	(%1), %%mm0		\n\t"
	"movq	(%2), %%mm1		\n\t"
	"addl	%4, %1			\n\t"
	"movq	(%1), %%mm2		\n\t"
	"movq	8(%2), %%mm3		\n\t"
	"addl	%4, %1			\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%3)		\n\t"
	"addl	%5, %3			\n\t"
	"movq	%%mm5, (%3)		\n\t"
	"addl	%5, %3			\n\t"
	"movq	(%1), %%mm0		\n\t"
	"movq	16(%2), %%mm1		\n\t"
	"addl	%4, %1			\n\t"
	"movq	(%1), %%mm2		\n\t"
	"movq	24(%2), %%mm3		\n\t"
	"addl	%4, %1			\n\t"
	"addl	$32, %2			\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%3)		\n\t"
	"addl	%5, %3			\n\t"
	"movq	%%mm5, (%3)		\n\t"
	"addl	%5, %3			\n\t"
	"subl	$4, %0			\n\t"
	"jnz	1b			\n\t"
#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
        :"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
#else
        :"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
#endif
	:"S"(src1Stride), "D"(dstStride)
	:"memory");
}

static void DEF(put, pixels16_x2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_BFE(mm6);
    __asm __volatile(
	"lea	(%3, %3), %%eax		\n\t"
	".balign 8			\n\t"
	"1:				\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, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%2)		\n\t"
	"movq	%%mm5, (%2, %3)		\n\t"
	"movq	8(%1), %%mm0		\n\t"
	"movq	9(%1), %%mm1		\n\t"
	"movq	8(%1, %3), %%mm2	\n\t"
	"movq	9(%1, %3), %%mm3	\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, 8(%2)		\n\t"
	"movq	%%mm5, 8(%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, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%2)		\n\t"
	"movq	%%mm5, (%2, %3)		\n\t"
	"movq	8(%1), %%mm0		\n\t"
	"movq	9(%1), %%mm1		\n\t"
	"movq	8(%1, %3), %%mm2	\n\t"
	"movq	9(%1, %3), %%mm3	\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, 8(%2)		\n\t"
	"movq	%%mm5, 8(%2, %3)	\n\t"
	"addl	%%eax, %1		\n\t"
	"addl	%%eax, %2		\n\t"
	"subl	$4, %0			\n\t"
	"jnz	1b			\n\t"
	:"+g"(h), "+S"(pixels), "+D"(block)
	:"r"(line_size)
	:"eax", "memory");
}

static void DEF(put, pixels16_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int dstStride, int src1Stride, int h)
{
    MOVQ_BFE(mm6);
    __asm __volatile(
	"testl $1, %0			\n\t"
        " jz 1f				\n\t"
	"movq	(%1), %%mm0		\n\t"
	"movq	(%2), %%mm1		\n\t"
	"movq	8(%1), %%mm2		\n\t"
	"movq	8(%2), %%mm3		\n\t"
	"addl	%4, %1			\n\t"
	"addl	$16, %2			\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%3)		\n\t"
	"movq	%%mm5, 8(%3)		\n\t"
	"addl	%5, %3			\n\t"
	"decl	%0			\n\t"
	".balign 8			\n\t"
	"1:				\n\t"
	"movq	(%1), %%mm0		\n\t"
	"movq	(%2), %%mm1		\n\t"
	"movq	8(%1), %%mm2		\n\t"
	"movq	8(%2), %%mm3		\n\t"
	"addl	%4, %1			\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%3)		\n\t"
	"movq	%%mm5, 8(%3)		\n\t"
	"addl	%5, %3			\n\t"
	"movq	(%1), %%mm0		\n\t"
	"movq	16(%2), %%mm1		\n\t"
	"movq	8(%1), %%mm2		\n\t"
	"movq	24(%2), %%mm3		\n\t"
	"addl	%4, %1			\n\t"
	PAVGBP(%%mm0, %%mm1, %%mm4,   %%mm2, %%mm3, %%mm5)
	"movq	%%mm4, (%3)		\n\t"
	"movq	%%mm5, 8(%3)		\n\t"
	"addl	%5, %3			\n\t"
	"addl	$32, %2			\n\t"
	"subl	$2, %0			\n\t"
	"jnz	1b			\n\t"
#ifdef PIC //Note "+bm" and "+mb" are buggy too (with gcc 3.2.2 at least) and cant be used
	:"+m"(h), "+a"(src1), "+c"(src2), "+d"(dst)
#else
	:"+b"(h), "+a"(src1), "+c"(src2), "+d"(dst)
#endif
	:"S"(src1Stride), "D"(dstStride)
	:"memory"); 
}

static void DEF(put, pixels8_y2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    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, %%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, %%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"
	"jnz	1b			\n\t"
	:"+g"(h), "+S"(pixels), "+D"(block)
	:"r"(line_size)
	:"eax", "memory");
}

static void DEF(put, pixels8_xy2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_ZERO(mm7);
    SET_RND(mm6); // =2 for rnd  and  =1 for no_rnd version
    __asm __volatile(
	"movq	(%1), %%mm0		\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 8      		\n\t"
	"1:				\n\t"
	"movq	(%1, %%eax), %%mm0	\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"

	"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)
	:"eax", "memory");
}

// avg_pixels
// in case more speed is needed - unroling would certainly help
static void DEF(avg, pixels8)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_BFE(mm6);
    JUMPALIGN();
    do {
	__asm __volatile(
	     "movq  %0, %%mm0		\n\t"
	     "movq  %1, %%mm1		\n\t"
	     PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	     "movq  %%mm2, %0		\n\t"
	     :"+m"(*block)
	     :"m"(*pixels)
	     :"memory");
	pixels += line_size;
	block += line_size;
    }
    while (--h);
}

static void DEF(avg, pixels16)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_BFE(mm6);
    JUMPALIGN();
    do {
	__asm __volatile(
	     "movq  %0, %%mm0		\n\t"
	     "movq  %1, %%mm1		\n\t"
	     PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	     "movq  %%mm2, %0		\n\t"
	     "movq  8%0, %%mm0		\n\t"
	     "movq  8%1, %%mm1		\n\t"
	     PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	     "movq  %%mm2, 8%0		\n\t"
	     :"+m"(*block)
	     :"m"(*pixels)
	     :"memory");
	pixels += line_size;
	block += line_size;
    }
    while (--h);
}

static void DEF(avg, pixels8_x2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_BFE(mm6);
    JUMPALIGN();
    do {
	__asm __volatile(
	    "movq  %1, %%mm0		\n\t"
	    "movq  1%1, %%mm1		\n\t"
	    "movq  %0, %%mm3		\n\t"
	    PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	    PAVGB(%%mm3, %%mm2, %%mm0, %%mm6)
	    "movq  %%mm0, %0		\n\t"
	    :"+m"(*block)
	    :"m"(*pixels)
	    :"memory");
	pixels += line_size;
	block += line_size;
    } while (--h);
}

static void DEF(avg, pixels8_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int dstStride, int src1Stride, int h)
{
    MOVQ_BFE(mm6);
    JUMPALIGN();
    do {
	__asm __volatile(
	    "movq  %1, %%mm0		\n\t"
	    "movq  %2, %%mm1		\n\t"
	    "movq  %0, %%mm3		\n\t"
	    PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	    PAVGB(%%mm3, %%mm2, %%mm0, %%mm6)
	    "movq  %%mm0, %0		\n\t"
	    :"+m"(*dst)
	    :"m"(*src1), "m"(*src2)
	    :"memory");
	dst += dstStride;
        src1 += src1Stride;
        src2 += 8;
    } while (--h);
}

static void DEF(avg, pixels16_x2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_BFE(mm6);
    JUMPALIGN();
    do {
	__asm __volatile(
	    "movq  %1, %%mm0		\n\t"
	    "movq  1%1, %%mm1		\n\t"
	    "movq  %0, %%mm3		\n\t"
	    PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	    PAVGB(%%mm3, %%mm2, %%mm0, %%mm6)
	    "movq  %%mm0, %0		\n\t"
	    "movq  8%1, %%mm0		\n\t"
	    "movq  9%1, %%mm1		\n\t"
	    "movq  8%0, %%mm3		\n\t"
	    PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	    PAVGB(%%mm3, %%mm2, %%mm0, %%mm6)
	    "movq  %%mm0, 8%0		\n\t"
	    :"+m"(*block)
	    :"m"(*pixels)
	    :"memory");
	pixels += line_size;
	block += line_size;
    } while (--h);
}

static void DEF(avg, pixels16_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int dstStride, int src1Stride, int h)
{
    MOVQ_BFE(mm6);
    JUMPALIGN();
    do {
	__asm __volatile(
	    "movq  %1, %%mm0		\n\t"
	    "movq  %2, %%mm1		\n\t"
	    "movq  %0, %%mm3		\n\t"
	    PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	    PAVGB(%%mm3, %%mm2, %%mm0, %%mm6)
	    "movq  %%mm0, %0		\n\t"
	    "movq  8%1, %%mm0		\n\t"
	    "movq  8%2, %%mm1		\n\t"
	    "movq  8%0, %%mm3		\n\t"
	    PAVGB(%%mm0, %%mm1, %%mm2, %%mm6)
	    PAVGB(%%mm3, %%mm2, %%mm0, %%mm6)
	    "movq  %%mm0, 8%0		\n\t"
	    :"+m"(*dst)
	    :"m"(*src1), "m"(*src2)
	    :"memory");
	dst += dstStride;
        src1 += src1Stride;
        src2 += 16;
    } while (--h);
}

static void DEF(avg, pixels8_y2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    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, %%mm4,   %%mm2, %%mm1, %%mm5)
	"movq	(%2), %%mm3		\n\t"
	PAVGB(%%mm3, %%mm4, %%mm0, %%mm6)
	"movq	(%2, %3), %%mm3		\n\t"
	PAVGB(%%mm3, %%mm5, %%mm1, %%mm6)
	"movq	%%mm0, (%2)		\n\t"
	"movq	%%mm1, (%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, %%mm4,   %%mm0, %%mm1, %%mm5)
	"movq	(%2), %%mm3		\n\t"
	PAVGB(%%mm3, %%mm4, %%mm2, %%mm6)
	"movq	(%2, %3), %%mm3		\n\t"
	PAVGB(%%mm3, %%mm5, %%mm1, %%mm6)
	"movq	%%mm2, (%2)		\n\t"
	"movq	%%mm1, (%2, %3)		\n\t"
	"addl	%%eax, %1		\n\t"
	"addl	%%eax, %2		\n\t"

	"subl	$4, %0			\n\t"
	"jnz	1b			\n\t"
	:"+g"(h), "+S"(pixels), "+D"(block)
	:"r"(line_size)
	:"eax", "memory");
}

// this routine is 'slightly' suboptimal but mostly unused
static void DEF(avg, pixels8_xy2)(uint8_t *block, const uint8_t *pixels, int line_size, int h)
{
    MOVQ_ZERO(mm7);
    SET_RND(mm6); // =2 for rnd  and  =1 for no_rnd version
    __asm __volatile(
	"movq	(%1), %%mm0		\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 8			\n\t"
	"1:				\n\t"
	"movq	(%1, %%eax), %%mm0	\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"
		"movq	(%2, %%eax), %%mm3	\n\t"
	"packuswb  %%mm5, %%mm4		\n\t"
		"pcmpeqd %%mm2, %%mm2	\n\t"
		"paddb %%mm2, %%mm2	\n\t"
		PAVGB(%%mm3, %%mm4, %%mm5, %%mm2)
		"movq	%%mm5, (%2, %%eax)	\n\t"
	"addl	%3, %%eax		\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"
		"movq	(%2, %%eax), %%mm3	\n\t"
	"packuswb  %%mm1, %%mm0		\n\t"
		"pcmpeqd %%mm2, %%mm2	\n\t"
		"paddb %%mm2, %%mm2	\n\t"
		PAVGB(%%mm3, %%mm0, %%mm1, %%mm2)
		"movq	%%mm1, (%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)
	:"eax", "memory");
}

//FIXME optimize
static void DEF(put, pixels16_y2)(uint8_t *block, const uint8_t *pixels, int line_size, int h){
    DEF(put, pixels8_y2)(block  , pixels  , line_size, h);
    DEF(put, pixels8_y2)(block+8, pixels+8, line_size, h);
}

static void DEF(put, pixels16_xy2)(uint8_t *block, const uint8_t *pixels, int line_size, int h){
    DEF(put, pixels8_xy2)(block  , pixels  , line_size, h);
    DEF(put, pixels8_xy2)(block+8, pixels+8, line_size, h);
}

static void DEF(avg, pixels16_y2)(uint8_t *block, const uint8_t *pixels, int line_size, int h){
    DEF(avg, pixels8_y2)(block  , pixels  , line_size, h);
    DEF(avg, pixels8_y2)(block+8, pixels+8, line_size, h);
}

static void DEF(avg, pixels16_xy2)(uint8_t *block, const uint8_t *pixels, int line_size, int h){
    DEF(avg, pixels8_xy2)(block  , pixels  , line_size, h);
    DEF(avg, pixels8_xy2)(block+8, pixels+8, line_size, h);
}