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Small changes to asm for better readability.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26375 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2010-05-29 14:56:25 +00:00
parent 56220785c1
commit 9ab57e510e
2 changed files with 49 additions and 46 deletions
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39
apps/codecs/libatrac/fixp_math.h
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@ -31,30 +31,33 @@
/* Fixed point math routines for use in atrac3.c */
#if defined(CPU_ARM)
/* Calculates: result = (X*Y)>>16 */
#define fixmul16(X,Y) \
({ \
int32_t low; \
int32_t high; \
asm volatile ( /* calculates: result = (X*Y)>>16 */ \
"smull %0,%1,%2,%3 \n\t" /* 64 = 32x32 multiply */ \
"mov %0, %0, lsr #16 \n\t" /* %0 = %0 >> 16 */ \
"orr %0, %0, %1, lsl #16 \n\t"/* result = %0 OR (%1 << 16) */ \
: "=&r"(low), "=&r" (high) \
: "r"(X),"r"(Y)); \
low; \
int32_t lo; \
int32_t hi; \
asm volatile ( \
"smull %[lo], %[hi], %[x], %[y] \n\t" /* multiply */ \
"mov %[lo], %[lo], lsr #16 \n\t" /* lo >>= 16 */ \
"orr %[lo], %[lo], %[hi], lsl #16" /* lo |= (hi << 16) */ \
: [lo]"=&r"(lo), [hi]"=&r"(hi) \
: [x]"r"(X), [y]"r"(Y)); \
lo; \
})
/* Calculates: result = (X*Y)>>31 */
/* Use scratch register r12 */
#define fixmul31(X,Y) \
({ \
int32_t low; \
int32_t high; \
asm volatile ( /* calculates: result = (X*Y)>>31 */ \
"smull %0,%1,%2,%3 \n\t" /* 64 = 32x32 multiply */ \
"mov %0, %0, lsr #31 \n\t" /* %0 = %0 >> 31 */ \
"orr %0, %0, %1, lsl #1 \n\t" /* result = %0 OR (%1 << 1) */ \
: "=&r"(low), "=&r" (high) \
: "r"(X),"r"(Y)); \
low; \
int32_t lo; \
int32_t hi; \
asm volatile ( \
"smull %[lo], %[hi], %[x], %[y] \n\t" /* multiply */ \
"mov %[lo], %[lo], lsr #31 \n\t" /* lo >>= 31 */ \
"orr %[lo], %[lo], %[hi], lsl #1" /* lo |= (hi << 1) */ \
: [lo]"=&r"(lo), [hi]"=&r"(hi) \
: [x]"r"(X), [y]"r"(Y)); \
lo; \
})
#elif defined(CPU_COLDFIRE)
#define fixmul16(X,Y) \