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dca: ARMv6 optimised decode_blockcode()

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Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit 08e3dea3f7f69309574dafc0af6671615e909720)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Mans Rullgard 2011-09-29 22:03:40 +01:00 committed by Michael Niedermayer
parent ab2539708a
commit d4999e0a79
2 changed files with 41 additions and 0 deletions
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39
libavcodec/arm/dca.h
View File

@ -23,6 +23,45 @@
#include <stdint.h>
#include "config.h"
#include "libavutil/intmath.h"
#if HAVE_ARMV6 && HAVE_INLINE_ASM
#define decode_blockcode decode_blockcode
static inline int decode_blockcode(int code, int levels, int *values)
{
int v0, v1, v2, v3;
__asm__ ("smmul %4, %8, %11 \n"
"smlabb %8, %4, %10, %8 \n"
"smmul %5, %4, %11 \n"
"sub %8, %8, %9, lsr #1 \n"
"smlabb %4, %5, %10, %4 \n"
"smmul %6, %5, %11 \n"
"str %8, %0 \n"
"sub %4, %4, %9, lsr #1 \n"
"smlabb %5, %6, %10, %5 \n"
"smmul %7, %6, %11 \n"
"str %4, %1 \n"
"sub %5, %5, %9, lsr #1 \n"
"smlabb %6, %7, %10, %6 \n"
"cmp %7, #0 \n"
"str %5, %2 \n"
"sub %6, %6, %9, lsr #1 \n"
"it eq \n"
"mvneq %7, #0 \n"
"str %6, %3 \n"
: "=m"(values[0]), "=m"(values[1]),
"=m"(values[2]), "=m"(values[3]),
"=&r"(v0), "=&r"(v1), "=&r"(v2), "=&r"(v3),
"+&r"(code)
: "r"(levels - 1), "r"(-levels), "r"(ff_inverse[levels])
: "cc");
return v3;
}
#endif
#if HAVE_NEON && HAVE_INLINE_ASM && HAVE_ASM_MOD_Y

2
libavcodec/dca.c
View File

@ -1038,6 +1038,7 @@ static void dca_downmix(float *samples, int srcfmt,
}
#ifndef decode_blockcode
/* Very compact version of the block code decoder that does not use table
* look-up but is slightly slower */
static int decode_blockcode(int code, int levels, int *values)
@ -1058,6 +1059,7 @@ static int decode_blockcode(int code, int levels, int *values)
return -1;
}
}
#endif
static const uint8_t abits_sizes[7] = { 7, 10, 12, 13, 15, 17, 19 };
static const uint8_t abits_levels[7] = { 3, 5, 7, 9, 13, 17, 25 };