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Add simple ASMed fixed point multiply functions for ARM to AC3. Gives a 38% speed up on my one sample with a Sansa.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18570 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Giacomelli 2008-09-23 00:51:22 +00:00
parent 0a1d3653bd
commit 9bc16e491d
1 changed files with 30 additions and 0 deletions
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30
apps/codecs/liba52/a52_internal.h
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@ -166,6 +166,36 @@ typedef int16_t quantizer_t;
: [A] "r" ((a)), [B] "r" ((b))); \
t; \
})
#elif defined(CPU_ARM)
#define MUL(x, y) \
({ int32_t __hi; \
uint32_t __lo; \
int32_t __result; \
asm ("smull %0, %1, %3, %4\n\t" \
"movs %2, %1, lsl #2" \
: "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
: "%r" (x), "r" (y) \
: "cc"); \
__result; \
})
#define MUL_L(x, y) \
({ int32_t __hi; \
uint32_t __lo; \
int32_t __result; \
asm ("smull %0, %1, %3, %4\n\t" \
"movs %0, %0, lsr %5\n\t" \
"adc %2, %0, %1, lsl %6" \
: "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
: "%r" (x), "r" (y), \
"M" (26), "M" (32 - 26) \
: "cc"); \
__result; \
})
#elif 1
#define MUL(a,b) \
({ int32_t _ta=(a), _tb=(b), _tc; \