diff options
author | Mans Rullgard <mans@mansr.com> | 2011-10-23 20:39:49 +0400 |
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committer | Mans Rullgard <mans@mansr.com> | 2011-11-25 17:19:53 +0400 |
commit | 00a856e3f95214c54a878b7cbd6e8ae8c5ce3ca9 (patch) | |
tree | 5fa20f30bafc61e71df1b89370f03b1dbf69505d /libavcodec/arm | |
parent | 035af998ad03020a3dda4e662dfb97c68bbabaaa (diff) |
dca: ARMv6 optimised decode_blockcode()
This is a hand-tuned version of the code with impossible parts of
the FASTDIV function ommitted.
2-5% faster overall on Cortex-A8.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libavcodec/arm')
-rw-r--r-- | libavcodec/arm/dca.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/libavcodec/arm/dca.h b/libavcodec/arm/dca.h index 38c8d1f9cc..9ff7f7c75e 100644 --- a/libavcodec/arm/dca.h +++ b/libavcodec/arm/dca.h @@ -23,6 +23,61 @@ #include <stdint.h> #include "config.h" +#include "libavutil/intmath.h" + +#if HAVE_ARMV6 && HAVE_INLINE_ASM + +#define decode_blockcodes decode_blockcodes +static inline int decode_blockcodes(int code1, int code2, int levels, + int *values) +{ + int v0, v1, v2, v3, v4, v5; + + __asm__ ("smmul %8, %14, %18 \n" + "smmul %11, %15, %18 \n" + "smlabb %14, %8, %17, %14 \n" + "smlabb %15, %11, %17, %15 \n" + "smmul %9, %8, %18 \n" + "smmul %12, %11, %18 \n" + "sub %14, %14, %16, lsr #1 \n" + "sub %15, %15, %16, lsr #1 \n" + "smlabb %8, %9, %17, %8 \n" + "smlabb %11, %12, %17, %11 \n" + "smmul %10, %9, %18 \n" + "smmul %13, %12, %18 \n" + "str %14, %0 \n" + "str %15, %4 \n" + "sub %8, %8, %16, lsr #1 \n" + "sub %11, %11, %16, lsr #1 \n" + "smlabb %9, %10, %17, %9 \n" + "smlabb %12, %13, %17, %12 \n" + "smmul %14, %10, %18 \n" + "smmul %15, %13, %18 \n" + "str %8, %1 \n" + "str %11, %5 \n" + "sub %9, %9, %16, lsr #1 \n" + "sub %12, %12, %16, lsr #1 \n" + "smlabb %10, %14, %17, %10 \n" + "smlabb %13, %15, %17, %13 \n" + "str %9, %2 \n" + "str %12, %6 \n" + "sub %10, %10, %16, lsr #1 \n" + "sub %13, %13, %16, lsr #1 \n" + "str %10, %3 \n" + "str %13, %7 \n" + : "=m"(values[0]), "=m"(values[1]), + "=m"(values[2]), "=m"(values[3]), + "=m"(values[4]), "=m"(values[5]), + "=m"(values[6]), "=m"(values[7]), + "=&r"(v0), "=&r"(v1), "=&r"(v2), + "=&r"(v3), "=&r"(v4), "=&r"(v5), + "+&r"(code1), "+&r"(code2) + : "r"(levels - 1), "r"(-levels), "r"(ff_inverse[levels])); + + return code1 | code2; +} + +#endif #if HAVE_NEON && HAVE_INLINE_ASM && HAVE_ASM_MOD_Y |