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ARMv6 vector mutiplication asm, speeds up vorbis decoding about 0.1MHz on gigabeat S.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26892 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2010-06-17 16:49:39 +00:00
parent b6c17c2c82
commit 3d2b1cfa6e
1 changed files with 50 additions and 0 deletions
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50
apps/codecs/libtremor/asm_arm.h
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@ -112,6 +112,32 @@ void vect_add_left_right(ogg_int32_t *x, const ogg_int32_t *y, int n)
} while (n);
}
#if ARM_ARCH >= 6
static inline
void vect_mult_fw(ogg_int32_t *data, LOOKUP_T *window, int n)
{
/* Note, mult_fw uses MULT31 */
do{
asm volatile (
"ldmia %[d], {r0, r1, r2, r3};"
"ldmia %[w]!, {r4, r5, r6, r7};"
"smmul r0, r4, r0;"
"smmul r1, r5, r1;"
"smmul r2, r6, r2;"
"smmul r3, r7, r3;"
"mov r0, r0, lsl #1;"
"mov r1, r1, lsl #1;"
"mov r2, r2, lsl #1;"
"mov r3, r3, lsl #1;"
"stmia %[d]!, {r0, r1, r2, r3};"
: [d] "+r" (data), [w] "+r" (window)
: : "r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7",
"memory" );
n -= 4;
} while (n);
}
#else
static inline
void vect_mult_fw(ogg_int32_t *data, LOOKUP_T *window, int n)
{
@ -136,7 +162,30 @@ void vect_mult_fw(ogg_int32_t *data, LOOKUP_T *window, int n)
n -= 4;
} while (n);
}
#endif
#if ARM_ARCH >= 6
static inline
void vect_mult_bw(ogg_int32_t *data, LOOKUP_T *window, int n)
{
/* NOTE mult_bw uses MULT_32 i.e. doesn't shift result left at end */
/* On ARM, we can do the shift at the same time as the overlap-add */
do{
asm volatile ("ldmia %[d], {r0, r1, r2, r3};"
"ldmda %[w]!, {r4, r5, r6, r7};"
"smmul r0, r7, r0;"
"smmul r1, r6, r1;"
"smmul r2, r5, r2;"
"smmul r3, r4, r3;"
"stmia %[d]!, {r0, r1, r2, r3};"
: [d] "+r" (data), [w] "+r" (window)
: : "r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7",
"memory" );
n -= 4;
} while (n);
}
#else
static inline
void vect_mult_bw(ogg_int32_t *data, LOOKUP_T *window, int n)
{
@ -157,6 +206,7 @@ void vect_mult_bw(ogg_int32_t *data, LOOKUP_T *window, int n)
n -= 4;
} while (n);
}
#endif
static inline void vect_copy(ogg_int32_t *x, const ogg_int32_t *y, int n)
{