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Implement put_pixels_clamped and add_pixels_clamped in Assembler. This

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allows better scheduling of the memory accesses, and is portable among
all compilers.

Originally committed as revision 709 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Falk Hüffner 23 years ago
parent e09d12f4f6
commit bb7d4939ba
4 changed files with 287 additions and 43 deletions
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  1. 3
      libavcodec/Makefile
  2. 106
      libavcodec/alpha/dsputil_alpha.c
  3. 176
      libavcodec/alpha/dsputil_alpha_asm.S
  4. 45
      libavcodec/alpha/regdef.h

3
libavcodec/Makefile
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@ -63,10 +63,11 @@ endif
# alpha specific stuff
ifeq ($(TARGET_ARCH_ALPHA),yes)
OBJS += alpha/dsputil_alpha.o alpha/mpegvideo_alpha.o
ASM_OBJS += alpha/dsputil_alpha_asm.o
CFLAGS += -Wa,-mpca56
endif
SRCS := $(OBJS:.o=.c) $(ASM_OBJS:.o=.s)
SRCS := $(OBJS:.o=.c) $(ASM_OBJS:.o=.S)
OBJS := $(OBJS) $(ASM_OBJS)
LIB= libavcodec.a

106
libavcodec/alpha/dsputil_alpha.c
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@ -22,64 +22,86 @@
void simple_idct_axp(DCTELEM *block);
static void put_pixels_clamped_axp(const DCTELEM *block, UINT8 *pixels,
int line_size)
void put_pixels_clamped_mvi_asm(const DCTELEM *block, uint8_t *pixels,
int line_size);
void add_pixels_clamped_mvi_asm(const DCTELEM *block, uint8_t *pixels,
int line_size);
#if 0
/* These functions were the base for the optimized assembler routines,
and remain here for documentation purposes. */
static void put_pixels_clamped_mvi(const DCTELEM *block, uint8_t *pixels,
int line_size)
{
int i = 8;
uint64_t clampmask = zap(-1, 0xaa); /* 0x00ff00ff00ff00ff */
ASM_ACCEPT_MVI;
do {
UINT64 shorts;
uint64_t shorts0, shorts1;
shorts = ldq(block);
shorts = maxsw4(shorts, 0);
shorts = minsw4(shorts, WORD_VEC(0x00ff));
stl(pkwb(shorts), pixels);
shorts0 = ldq(block);
shorts0 = maxsw4(shorts0, 0);
shorts0 = minsw4(shorts0, clampmask);
stl(pkwb(shorts0), pixels);
shorts = ldq(block + 4);
shorts = maxsw4(shorts, 0);
shorts = minsw4(shorts, WORD_VEC(0x00ff));
stl(pkwb(shorts), pixels + 4);
shorts1 = ldq(block + 4);
shorts1 = maxsw4(shorts1, 0);
shorts1 = minsw4(shorts1, clampmask);
stl(pkwb(shorts1), pixels + 4);
pixels += line_size;
block += 8;
pixels += line_size;
block += 8;
} while (--i);
}
static void add_pixels_clamped_axp(const DCTELEM *block, UINT8 *pixels,
int line_size)
void add_pixels_clamped_mvi(const DCTELEM *block, uint8_t *pixels,
int line_size)
{
int i = 8;
int h = 8;
/* Keep this function a leaf function by generating the constants
manually (mainly for the hack value ;-). */
uint64_t clampmask = zap(-1, 0xaa); /* 0x00ff00ff00ff00ff */
uint64_t signmask = zap(-1, 0x33);
signmask ^= signmask >> 1; /* 0x8000800080008000 */
ASM_ACCEPT_MVI;
do {
UINT64 shorts;
shorts = ldq(block);
shorts &= ~WORD_VEC(0x8000); /* clear highest bit to avoid overflow */
shorts += unpkbw(ldl(pixels));
shorts &= ~WORD_VEC(0x8000); /* hibit would be set for e. g. -2 + 3 */
shorts = minuw4(shorts, WORD_VEC(0x4000)); /* set neg. to 0x4000 */
shorts &= ~WORD_VEC(0x4000); /* ...and zap them */
shorts = minsw4(shorts, WORD_VEC(0x00ff)); /* clamp to 255 */
stl(pkwb(shorts), pixels);
/* next 4 */
shorts = ldq(block + 4);
shorts &= ~WORD_VEC(0x8000);
shorts += unpkbw(ldl(pixels + 4));
shorts &= ~WORD_VEC(0x8000);
shorts = minuw4(shorts, WORD_VEC(0x4000));
shorts &= ~WORD_VEC(0x4000);
shorts = minsw4(shorts, WORD_VEC(0x00ff));
stl(pkwb(shorts), pixels + 4);
pixels += line_size;
block += 8;
} while (--i);
uint64_t shorts0, pix0, signs0;
uint64_t shorts1, pix1, signs1;
shorts0 = ldq(block);
shorts1 = ldq(block + 4);
pix0 = unpkbw(ldl(pixels));
/* Signed subword add (MMX paddw). */
signs0 = shorts0 & signmask;
shorts0 &= ~signmask;
shorts0 += pix0;
shorts0 ^= signs0;
/* Clamp. */
shorts0 = maxsw4(shorts0, 0);
shorts0 = minsw4(shorts0, clampmask);
/* Next 4. */
pix1 = unpkbw(ldl(pixels + 4));
signs1 = shorts1 & signmask;
shorts1 &= ~signmask;
shorts1 += pix1;
shorts1 ^= signs1;
shorts1 = maxsw4(shorts1, 0);
shorts1 = minsw4(shorts1, clampmask);
stl(pkwb(shorts0), pixels);
stl(pkwb(shorts1), pixels + 4);
pixels += line_size;
block += 8;
} while (--h);
}
#endif
/* Average 8 unsigned bytes in parallel: (b1 + b2) >> 1
Since the immediate result could be greater than 255, we do the
@ -222,7 +244,7 @@ void dsputil_init_alpha(void)
/* amask clears all bits that correspond to present features. */
if (amask(AMASK_MVI) == 0) {
put_pixels_clamped = put_pixels_clamped_axp;
add_pixels_clamped = add_pixels_clamped_axp;
put_pixels_clamped = put_pixels_clamped_mvi_asm;
add_pixels_clamped = add_pixels_clamped_mvi_asm;
}
}

176
libavcodec/alpha/dsputil_alpha_asm.S
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@ -0,0 +1,176 @@
/*
* Alpha optimized DSP utils
* Copyright (c) 2002 Falk Hueffner <falk@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* These functions are scheduled for pca56. They should work
* reasonably on ev6, though.
*/
#include "regdef.h"
/* Some nicer register names. */
#define ta t10
#define tb t11
#define tc t12
#define td AT
/* Danger: these overlap with the argument list and the return value */
#define te a5
#define tf a4
#define tg a3
#define th v0
.set noat
.set noreorder
.arch pca56
.text
/************************************************************************
* void put_pixels_clamped_mvi_asm(const DCTELEM *block, uint8_t *pixels,
* int line_size)
*/
.align 6
.globl put_pixels_clamped_mvi_asm
.ent put_pixels_clamped_mvi_asm
put_pixels_clamped_mvi_asm:
.frame sp, 0, ra
.prologue 0
lda t8, -1
lda t9, 8 # loop counter
zap t8, 0xaa, t8 # 00ff00ff00ff00ff
.align 4
1: ldq t0, 0(a0)
ldq t1, 8(a0)
ldq t2, 16(a0)
ldq t3, 24(a0)
maxsw4 t0, zero, t0
subq t9, 2, t9
maxsw4 t1, zero, t1
lda a0, 32(a0)
maxsw4 t2, zero, t2
addq a1, a2, ta
maxsw4 t3, zero, t3
minsw4 t0, t8, t0
minsw4 t1, t8, t1
minsw4 t2, t8, t2
minsw4 t3, t8, t3
pkwb t0, t0
pkwb t1, t1
pkwb t2, t2
pkwb t3, t3
stl t0, 0(a1)
stl t1, 4(a1)
addq ta, a2, a1
stl t2, 0(ta)
stl t3, 4(ta)
bne t9, 1b
ret
.end put_pixels_clamped_mvi_asm
/************************************************************************
* void add_pixels_clamped_mvi_asm(const DCTELEM *block, uint8_t *pixels,
* int line_size)
*/
.align 6
.globl add_pixels_clamped_mvi_asm
.ent add_pixels_clamped_mvi_asm
add_pixels_clamped_mvi_asm:
.frame sp, 0, ra
.prologue 0
lda t1, -1
lda th, 8
zap t1, 0x33, tg
nop
srl tg, 1, t0
xor tg, t0, tg # 0x8000800080008000
zap t1, 0xaa, tf # 0x00ff00ff00ff00ff
.align 4
1: ldl t1, 0(a1) # pix0 (try to hit cache line soon)
ldl t4, 4(a1) # pix1
addq a1, a2, te # pixels += line_size
ldq t0, 0(a0) # shorts0
ldl t7, 0(te) # pix2 (try to hit cache line soon)
ldl ta, 4(te) # pix3
ldq t3, 8(a0) # shorts1
ldq t6, 16(a0) # shorts2
ldq t9, 24(a0) # shorts3
unpkbw t1, t1 # 0 0 (quarter/op no.)
and t0, tg, t2 # 0 1
unpkbw t4, t4 # 1 0
bic t0, tg, t0 # 0 2
unpkbw t7, t7 # 2 0
and t3, tg, t5 # 1 1
addq t0, t1, t0 # 0 3
xor t0, t2, t0 # 0 4
unpkbw ta, ta # 3 0
and t6, tg, t8 # 2 1
maxsw4 t0, zero, t0 # 0 5
bic t3, tg, t3 # 1 2
bic t6, tg, t6 # 2 2
minsw4 t0, tf, t0 # 0 6
addq t3, t4, t3 # 1 3
pkwb t0, t0 # 0 7
xor t3, t5, t3 # 1 4
maxsw4 t3, zero, t3 # 1 5
addq t6, t7, t6 # 2 3
xor t6, t8, t6 # 2 4
and t9, tg, tb # 3 1
minsw4 t3, tf, t3 # 1 6
bic t9, tg, t9 # 3 2
maxsw4 t6, zero, t6 # 2 5
addq t9, ta, t9 # 3 3
stl t0, 0(a1) # 0 8
minsw4 t6, tf, t6 # 2 6
xor t9, tb, t9 # 3 4
maxsw4 t9, zero, t9 # 3 5
lda a0, 32(a0) # block += 16;
pkwb t3, t3 # 1 7
minsw4 t9, tf, t9 # 3 6
subq th, 2, th
pkwb t6, t6 # 2 7
pkwb t9, t9 # 3 7
stl t3, 4(a1) # 1 8
addq te, a2, a1 # pixels += line_size
stl t6, 0(te) # 2 8
stl t9, 4(te) # 3 8
bne th, 1b
ret
.end add_pixels_clamped_mvi_asm

45
libavcodec/alpha/regdef.h
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@ -0,0 +1,45 @@
/* Some BSDs don't seem to have regdef.h... sigh */
#ifndef alpha_regdef_h
#define alpha_regdef_h
#define v0 $0 /* function return value */
#define t0 $1 /* temporary registers (caller-saved) */
#define t1 $2
#define t2 $3
#define t3 $4
#define t4 $5
#define t5 $6
#define t6 $7
#define t7 $8
#define s0 $9 /* saved-registers (callee-saved registers) */
#define s1 $10
#define s2 $11
#define s3 $12
#define s4 $13
#define s5 $14
#define s6 $15
#define fp s6 /* frame-pointer (s6 in frame-less procedures) */
#define a0 $16 /* argument registers (caller-saved) */
#define a1 $17
#define a2 $18
#define a3 $19
#define a4 $20
#define a5 $21
#define t8 $22 /* more temps (caller-saved) */
#define t9 $23
#define t10 $24
#define t11 $25
#define ra $26 /* return address register */
#define t12 $27
#define pv t12 /* procedure-variable register */
#define AT $at /* assembler temporary */
#define gp $29 /* global pointer */
#define sp $30 /* stack pointer */
#define zero $31 /* reads as zero, writes are noops */
#endif /* alpha_regdef_h */
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