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/*
* average.c -- average two sets of byte data
* Written by Andrew Church <achurch@achurch.org>
*
* This file is part of transcode, a video stream processing tool.
* transcode is free software, distributable under the terms of the GNU
* General Public License (version 2 or later). See the file COPYING
* for details.
*/
#include "ac.h"
#include "ac_internal.h"
static void average(const uint8_t *, const uint8_t *, uint8_t *, int);
static void (*average_ptr)(const uint8_t *, const uint8_t *, uint8_t *, int)
= average;
/*************************************************************************/
/* External interface */
void ac_average(const uint8_t *src1, const uint8_t *src2,
uint8_t *dest, int bytes)
{
(*average_ptr)(src1, src2, dest, bytes);
}
/*************************************************************************/
/*************************************************************************/
/* Vanilla C version */
static void average(const uint8_t *src1, const uint8_t *src2,
uint8_t *dest, int bytes)
{
int i;
for (i = 0; i < bytes; i++)
dest[i] = (src1[i]+src2[i]+1) / 2;
}
/*************************************************************************/
#if defined(HAVE_ASM_MMX) && defined(ARCH_X86) /* i.e. not x86_64 */
static void average_mmx(const uint8_t *src1, const uint8_t *src2,
uint8_t *dest, int bytes)
{
if (bytes >= 8) {
asm("\
pxor %%mm7, %%mm7 \n\
movq %%mm7, %%mm6 \n\
pcmpeqw %%mm5, %%mm5 \n\
psubw %%mm5, %%mm6 # Put 0x0001*4 in MM6 \n\
0: \n\
movq -8(%%esi,%%eax), %%mm0 \n\
movq %%mm0, %%mm1 \n\
punpcklbw %%mm7, %%mm0 \n\
punpckhbw %%mm7, %%mm1 \n\
movq -8(%%edx,%%eax), %%mm2 \n\
movq %%mm2, %%mm3 \n\
punpcklbw %%mm7, %%mm2 \n\
punpckhbw %%mm7, %%mm3 \n\
paddw %%mm2, %%mm0 \n\
paddw %%mm6, %%mm0 \n\
psrlw $1, %%mm0 \n\
paddw %%mm3, %%mm1 \n\
paddw %%mm6, %%mm1 \n\
psrlw $1, %%mm1 \n\
packuswb %%mm1, %%mm0 \n\
movq %%mm0, -8(%%edi,%%eax) \n\
subl $8, %%eax \n\
jnz 0b \n\
emms"
: /* no outputs */
: "S" (src1), "d" (src2), "D" (dest), "a" (bytes & ~7));
}
if (UNLIKELY(bytes & 7)) {
average(src1+(bytes & ~7), src2+(bytes & ~7), dest+(bytes & ~7),
bytes & 7);
}
}
#endif /* HAVE_ASM_MMX && ARCH_X86 */
/*************************************************************************/
#if defined(HAVE_ASM_SSE) && defined(ARCH_X86)
/* SSE has PAVGB */
static void average_sse(const uint8_t *src1, const uint8_t *src2,
uint8_t *dest, int bytes)
{
if (bytes >= 8) {
asm("\
testl $~0x1F, %%eax \n\
jz 1f \n\
0: \n\
movq -32(%%esi,%%eax), %%mm0 \n\
movq -24(%%esi,%%eax), %%mm1 \n\
movq -16(%%esi,%%eax), %%mm2 \n\
movq -8(%%esi,%%eax), %%mm3 \n\
movq -32(%%edx,%%eax), %%mm4 \n\
pavgb %%mm4, %%mm0 \n\
movq -24(%%edx,%%eax), %%mm5 \n\
pavgb %%mm5, %%mm1 \n\
movq -16(%%edx,%%eax), %%mm6 \n\
pavgb %%mm6, %%mm2 \n\
movq -8(%%edx,%%eax), %%mm7 \n\
pavgb %%mm7, %%mm3 \n\
movntq %%mm0, -32(%%edi,%%eax) \n\
movntq %%mm1, -24(%%edi,%%eax) \n\
movntq %%mm2, -16(%%edi,%%eax) \n\
movntq %%mm3, -8(%%edi,%%eax) \n\
subl $32, %%eax \n\
testl $~0x1F, %%eax \n\
jnz 0b \n\
testl %%eax, %%eax \n\
jz 2f \n\
1: \n\
movq -8(%%esi,%%eax), %%mm0 \n\
movq -8(%%edx,%%eax), %%mm1 \n\
pavgb %%mm1, %%mm0 \n\
movntq %%mm0, -8(%%edi,%%eax) \n\
subl $8, %%eax \n\
jnz 1b \n\
2: \n\
emms \n\
sfence"
: /* no outputs */
: "S" (src1), "d" (src2), "D" (dest), "a" (bytes & ~7));
}
if (UNLIKELY(bytes & 7)) {
average(src1+(bytes & ~7), src2+(bytes & ~7), dest+(bytes & ~7),
bytes & 7);
}
}
#endif /* HAVE_ASM_SSE && ARCH_X86 */
/*************************************************************************/
#if defined(HAVE_ASM_SSE2)
#if defined(ARCH_X86_64)
# define EAX "%%rax"
# define EDX "%%rdx"
# define ESI "%%rsi"
# define EDI "%%rdi"
#else
# define EAX "%%eax"
# define EDX "%%edx"
# define ESI "%%esi"
# define EDI "%%edi"
#endif
static void average_sse2(const uint8_t *src1, const uint8_t *src2,
uint8_t *dest, int bytes)
{
if (bytes >= 8) {
asm("\
testl $~0x3F, %%eax \n\
jz 1f \n\
0: \n\
movdqu -64("ESI","EAX"), %%xmm0 \n\
movdqu -48("ESI","EAX"), %%xmm1 \n\
movdqu -32("ESI","EAX"), %%xmm2 \n\
movdqu -16("ESI","EAX"), %%xmm3 \n\
movdqu -64("EDX","EAX"), %%xmm4 \n\
pavgb %%xmm4, %%xmm0 \n\
movdqu -48("EDX","EAX"), %%xmm5 \n\
pavgb %%xmm5, %%xmm1 \n\
movdqu -32("EDX","EAX"), %%xmm6 \n\
pavgb %%xmm6, %%xmm2 \n\
movdqu -16("EDX","EAX"), %%xmm7 \n\
pavgb %%xmm7, %%xmm3 \n\
# Note that movntdq requires 16-byte alignment, which we're \n\
# not guaranteed \n\
movdqu %%xmm0, -64("EDI","EAX") \n\
movdqu %%xmm1, -48("EDI","EAX") \n\
movdqu %%xmm2, -32("EDI","EAX") \n\
movdqu %%xmm3, -16("EDI","EAX") \n\
subl $64, %%eax \n\
testl $~0x3F, %%eax \n\
jnz 0b \n\
testl %%eax, %%eax \n\
jz 2f \n\
1: \n\
movq -8("ESI","EAX"), %%mm0 \n\
movq -8("EDX","EAX"), %%mm1 \n\
pavgb %%mm1, %%mm0 \n\
movq %%mm0, -8("EDI","EAX") \n\
subl $8, %%eax \n\
jnz 1b \n\
2: \n\
emms"
: /* no outputs */
: "S" (src1), "d" (src2), "D" (dest), "a" (bytes & ~7));
}
if (UNLIKELY(bytes & 7)) {
average(src1+(bytes & ~7), src2+(bytes & ~7), dest+(bytes & ~7),
bytes & 7);
}
}
#endif /* HAVE_ASM_SSE2 */
/*************************************************************************/
/*************************************************************************/
/* Initialization routine. */
int ac_average_init(int accel)
{
average_ptr = average;
#if defined(HAVE_ASM_MMX) && defined(ARCH_X86)
if (HAS_ACCEL(accel, AC_MMX))
average_ptr = average_mmx;
#endif
#if defined(HAVE_ASM_SSE) && defined(ARCH_X86)
if (HAS_ACCEL(accel, AC_SSE))
average_ptr = average_sse;
#endif
#if defined(HAVE_ASM_SSE2)
if (HAS_ACCEL(accel, AC_SSE2))
average_ptr = average_sse2;
#endif
return 1;
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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