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Small Musepack optimisation.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6685 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2005-06-12 12:43:05 +00:00
parent 3c30ee51d8
commit 649acec2fc
2 changed files with 18 additions and 1 deletions
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16
apps/codecs/libmusepack/math.h
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@ -99,8 +99,24 @@ static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY_EX(MPC_SAMPLE_FORMAT item1,MPC_SAMP
#ifdef MPC_HAVE_MULHIGH
#define MPC_MULTIPLY_FRACT(X,Y) _MulHigh(X,Y)
#else
#if CONFIG_CPU==MCF5249 && !defined(SIMULATOR)
/* loses one bit of accuracy.
the rest of the macros won't be as easy as this... */
#define MPC_MULTIPLY_FRACT(X,Y) \
({ \
MPC_SAMPLE_FORMAT t; \
asm volatile ( \
"mac.l %[A], %[B], %%acc0\n\t" \
"movclr.l %%acc0, %[t]\n\t" \
"asr.l #1, %[t]\n\t" \
: [t] "=d" (t) \
: [A] "r" ((X)), [B] "r" ((Y))); \
t; \
})
#else
#define MPC_MULTIPLY_FRACT(X,Y) MPC_MULTIPLY_EX(X,Y,32)
#endif
#endif
#define MPC_MAKE_FRACT_CONST(X) (MPC_SAMPLE_FORMAT)((X) * (double)(((mpc_int64_t)1)<<32) )
#define MPC_MULTIPLY_FRACT_CONST(X,Y) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST(Y))