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armv5 optimizations

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patch by Siarhei Siamashka siarhei.siamashka at gmail com

Originally committed as revision 6228 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Siarhei Siamashka 2006-09-10 22:29:02 +00:00 committed by Diego Biurrun
parent 8c3dd5dc9c
commit 024da4b146
1 changed files with 16 additions and 0 deletions
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16
libavcodec/mpegaudiodec.c
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@ -27,6 +27,11 @@
#include "bitstream.h"
#include "dsputil.h"
/* Assume that all Intel XScale processors support armv5 edsp instructions */
#if defined(ARCH_ARMV4L) && defined (HAVE_IWMMXT)
#define ARCH_ARM5E
#endif
/*
* TODO:
* - in low precision mode, use more 16 bit multiplies in synth filter
@ -791,6 +796,17 @@ static inline int round_sample(int *sum)
/* signed 16x16 -> 32 multiply */
# define MULS(ra, rb) \
({ int __rt; asm ("mullhw %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); __rt; })
# elif defined(ARCH_ARM5E)
/* signed 16x16 -> 32 multiply add accumulate */
# define MACS(rt, ra, rb) \
asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
/* signed 16x16 -> 32 multiply */
# define MULS(ra, rb) \
({ int __rt; asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); __rt; })
# else
/* signed 16x16 -> 32 multiply add accumulate */
# define MACS(rt, ra, rb) rt += (ra) * (rb)