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pdbox: Added Coldfire multiplication optimization by Buschel.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26550 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Wincent Balin 2010-06-04 18:21:47 +00:00
parent 2464eaeba1
commit d166d61b09
1 changed files with 22 additions and 3 deletions
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25
apps/plugins/pdbox/PDa/src/m_fixed.h
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@ -16,7 +16,8 @@ typedef int t_sample;
/* fixed point multiplication and division */ /* fixed point multiplication and division */
#if defined(ROCKBOX) && defined(CPU_ARM) #ifdef ROCKBOX
#if defined(CPU_ARM)
#define mult(A,B) \ #define mult(A,B) \
({ \ ({ \
t_fixed lo; \ t_fixed lo; \
@ -30,10 +31,28 @@ typedef int t_sample;
lo; \ lo; \
}) })
#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) ) #define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
#else /* ROCKBOX && CPU_ARM */ #elif defined(CPU_COLDFIRE)
#define mult(a,b) mult_cf((a),(b))
static inline t_fixed mult_cf(t_fixed x, t_fixed y)
{
t_fixed t1, t2;
asm volatile (
"mac.l %[x],%[y],%%acc0 \n" /* multiply */
"mulu.l %[y],%[x] \n" /* get low half, avoid emac stall */
"movclr.l %%acc0,%[t1] \n" /* get higher half */
"asl.l %[shl],%[t1] \n" /* hi <<= 13, plus one free */
"lsr.l %[shr],%[x] \n" /* (unsigned)lo >>= 18 */
"or.l %[x],%[t1] \n" /* combine result */
: [t1]"=&d"(t1), [t2]"=&d"(t2), [x]"+d"(x)
: [y]"d"(y), [shl]"d"(31-fix1), [shr]"d"(fix1));
return t1;
}
#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
#endif /* CPU_... */
#else /* ROCKBOX */
#define mult(a,b) (long long)(((long long) (a) * (long long) (b))>>fix1) #define mult(a,b) (long long)(((long long) (a) * (long long) (b))>>fix1)
#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) ) #define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
#endif /* ROCKBOX && CPU_ARM */ #endif /* ROCKBOX */
/* conversion macros */ /* conversion macros */