FFmpeg/libavcodec/i386/dsputil_mmx_avg.h

/*
 * DSP utils : average functions are compiled twice for 3dnow/mmx2
 * Copyright (c) 2000, 2001 Fabrice Bellard.
 * Copyright (c) 2002 Michael Niedermayer
 *
 * 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>
 */
 
/* XXX: we use explicit registers to avoid a gcc 2.95.2 register asm
   clobber bug - now it will work with 2.95.2 and also with -fPIC
 */
static void DEF(put_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
    __asm __volatile(
	"lea (%3, %3), %%eax		\n\t"
	"1:				\n\t"
	"movq (%1), %%mm0		\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	PAVGB" 1(%1), %%mm0		\n\t"
	PAVGB" 1(%1, %3), %%mm1		\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm1, (%2, %3)		\n\t"
	"addl %%eax, %1			\n\t"
	"addl %%eax, %2			\n\t"
	"movq (%1), %%mm0		\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	PAVGB" 1(%1), %%mm0		\n\t"
	PAVGB" 1(%1, %3), %%mm1		\n\t"
	"addl %%eax, %1			\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm1, (%2, %3)		\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");
}
 
/* 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"
	"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 %%mm6, %%mm0		\n\t"
	"psubusb %%mm6, %%mm2		\n\t"
	PAVGB" %%mm1, %%mm0		\n\t"
	PAVGB" %%mm3, %%mm2		\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm2, (%2, %3)		\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"
	"addl %%eax, %2			\n\t"
	"addl %%eax, %1			\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"
	"movq %%mm2, (%2, %3)		\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_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
    __asm __volatile(
	"lea (%3, %3), %%eax		\n\t"
	"movq (%1), %%mm0		\n\t"
	"subl %3, %2			\n\t"
	"1:				\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm2	\n\t"
	"addl %%eax, %1			\n\t"
	PAVGB" %%mm1, %%mm0		\n\t"
	PAVGB" %%mm2, %%mm1		\n\t"
	"movq %%mm0, (%2, %3)		\n\t"
	"movq %%mm1, (%2, %%eax)	\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm0	\n\t"
	"addl %%eax, %2			\n\t"
	"addl %%eax, %1			\n\t"
	PAVGB" %%mm1, %%mm2		\n\t"
	PAVGB" %%mm0, %%mm1		\n\t"
	"movq %%mm2, (%2, %3)		\n\t"
	"movq %%mm1, (%2, %%eax)	\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");
}

/* 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(
	"lea (%3, %3), %%eax		\n\t"
	"movq (%1), %%mm0		\n\t"
	"subl %3, %2			\n\t"
	"1:				\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm2	\n\t"
	"addl %%eax, %1			\n\t"
	"psubusb %%mm6, %%mm1		\n\t"
	PAVGB" %%mm1, %%mm0		\n\t"
	PAVGB" %%mm2, %%mm1		\n\t"
	"movq %%mm0, (%2, %3)		\n\t"
	"movq %%mm1, (%2, %%eax)	\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm0	\n\t"
	"addl %%eax, %2			\n\t"
	"addl %%eax, %1			\n\t"
	"psubusb %%mm6, %%mm1		\n\t"
	PAVGB" %%mm1, %%mm2		\n\t"
	PAVGB" %%mm0, %%mm1		\n\t"
	"movq %%mm2, (%2, %3)		\n\t"
	"movq %%mm1, (%2, %%eax)	\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(avg_pixels)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
    __asm __volatile(
	"lea (%3, %3), %%eax		\n\t"
	"1:				\n\t"
	"movq (%2), %%mm0		\n\t"
	"movq (%2, %3), %%mm1		\n\t"
	PAVGB" (%1), %%mm0		\n\t"
	PAVGB" (%1, %3), %%mm1		\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm1, (%2, %3)		\n\t"
	"addl %%eax, %1			\n\t"
	"addl %%eax, %2			\n\t"
	"movq (%2), %%mm0		\n\t"
	"movq (%2, %3), %%mm1		\n\t"
	PAVGB" (%1), %%mm0		\n\t"
	PAVGB" (%1, %3), %%mm1		\n\t"
	"addl %%eax, %1			\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm1, (%2, %3)		\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(avg_pixels_x2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
    __asm __volatile(
	"lea (%3, %3), %%eax		\n\t"
	"1:				\n\t"
	"movq (%1), %%mm0		\n\t"
	"movq (%1, %3), %%mm2		\n\t"
	PAVGB" 1(%1), %%mm0		\n\t"
	PAVGB" 1(%1, %3), %%mm2		\n\t"
	PAVGB" (%2), %%mm0		\n\t"
	PAVGB" (%2, %3), %%mm2		\n\t"
	"addl %%eax, %1			\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm2, (%2, %3)		\n\t"
	"movq (%1), %%mm0		\n\t"
	"movq (%1, %3), %%mm2		\n\t"
	PAVGB" 1(%1), %%mm0		\n\t"
	PAVGB" 1(%1, %3), %%mm2		\n\t"
	"addl %%eax, %2			\n\t"
	"addl %%eax, %1			\n\t"
	PAVGB" (%2), %%mm0		\n\t"
	PAVGB" (%2, %3), %%mm2		\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm2, (%2, %3)		\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(avg_pixels_y2)(UINT8 *block, const UINT8 *pixels, int line_size, int h)
{
    __asm __volatile(
	"lea (%3, %3), %%eax		\n\t"
	"movq (%1), %%mm0		\n\t"
	"subl %3, %2			\n\t"
	"1:				\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm2	\n\t"
	"addl %%eax, %1			\n\t"
	PAVGB" %%mm1, %%mm0		\n\t"
	PAVGB" %%mm2, %%mm1		\n\t"
	"movq (%2, %3), %%mm3		\n\t"
	"movq (%2, %%eax), %%mm4	\n\t"
	PAVGB" %%mm3, %%mm0		\n\t"
	PAVGB" %%mm4, %%mm1		\n\t"
	"movq %%mm0, (%2, %3)		\n\t"
	"movq %%mm1, (%2, %%eax)	\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm0	\n\t"
	PAVGB" %%mm1, %%mm2		\n\t"
	PAVGB" %%mm0, %%mm1		\n\t"
	"addl %%eax, %2			\n\t"
	"addl %%eax, %1			\n\t"
	"movq (%2, %3), %%mm3		\n\t"
	"movq (%2, %%eax), %%mm4	\n\t"
	PAVGB" %%mm3, %%mm2		\n\t"
	PAVGB" %%mm4, %%mm1		\n\t"
	"movq %%mm2, (%2, %3)		\n\t"
	"movq %%mm1, (%2, %%eax)	\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");
}

// 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(
	"lea (%3, %3), %%eax		\n\t"
	"movq (%1), %%mm0		\n\t"
	PAVGB" 1(%1), %%mm0		\n\t"
	".balign 8			\n\t"
	"1:				\n\t"
	"movq (%1, %%eax), %%mm2	\n\t"
	"movq (%1, %3), %%mm1		\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"
	PAVGB" %%mm1, %%mm0		\n\t"
	PAVGB" %%mm2, %%mm1		\n\t"
	PAVGB" (%2), %%mm0		\n\t"
	PAVGB" (%2, %3), %%mm1		\n\t"
	"movq %%mm0, (%2)		\n\t"
	"movq %%mm1, (%2, %3)		\n\t"
	"movq (%1, %3), %%mm1		\n\t"
	"movq (%1, %%eax), %%mm0	\n\t"
	PAVGB" 1(%1, %3), %%mm1		\n\t"
	PAVGB" 1(%1, %%eax), %%mm0	\n\t"
	"addl %%eax, %2			\n\t"
	"addl %%eax, %1			\n\t"
	PAVGB" %%mm1, %%mm2		\n\t"
	PAVGB" %%mm0, %%mm1		\n\t"
	PAVGB" (%2), %%mm2		\n\t"
	PAVGB" (%2, %3), %%mm1		\n\t"
	"movq %%mm2, (%2)		\n\t"
	"movq %%mm1, (%2, %3)		\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");
}