Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

libtremor: arm asm for ff_vector_fmul_window_c on v4 and v5 cores, speeds up c200v1 and fuzev1 by ~0.4MHz and ipod classic by ~1MHz.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30584 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2011-09-23 14:01:48 +00:00
parent 2abb52a084
commit d1e241f55a
1 changed files with 48 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

48
apps/codecs/libtremor/asm_arm.h
View file

@ -16,7 +16,55 @@
********************************************************************/
#ifdef _ARM_ASSEM_
#if ARM_ARCH < 6
#define INCL_OPTIMIZED_VECTOR_FMUL_WINDOW
static inline void ff_vector_fmul_window_c(ogg_int32_t *dst, const ogg_int32_t *src0,
const ogg_int32_t *src1, const ogg_int32_t *win, int len)
{
/* len is always a power of 2 and always >= 16 so this is unrolled 2 times*/
ogg_int32_t *dst0 = dst, *dst1 = dst + 2*len;
const ogg_int32_t *win0 = win, *win1 = win + 2*len;
src1 += len;
asm volatile ("cmp %[len], #0\n\t"
"b 1f\n\t"
"0:\n\t"
"ldr r0, [%[src0]], #4\n\t"
"ldr r1, [%[src1], #-4]!\n\t"
"ldr r2, [%[win0]], #4\n\t"
"ldr r3, [%[win1], #-4]!\n\t"
"smull r4, r5, r0, r2\n\t"
"smlal r4, r5, r1, r3\n\t"
"rsb r2, r2, #0\n\t"
"lsl r5, r5, #1\n\t"
"str r5, [%[dst1], #-4]!\n\t"
"smull r4, r5, r0, r3\n\t"
"smlal r4, r5, r1, r2\n\t"
"ldr r0, [%[src0]], #4\n\t"
"ldr r1, [%[src1], #-4]!\n\t"
"lsl r5, r5, #1\n\t"
"str r5, [%[dst0]], #4\n\t"
"ldr r2, [%[win0]], #4\n\t"
"ldr r3, [%[win1], #-4]!\n\t"
"smull r4, r5, r0, r2\n\t"
"smlal r4, r5, r1, r3\n\t"
"rsb r2, r2, #0\n\t"
"lsl r5, r5, #1\n\t"
"str r5, [%[dst1], #-4]!\n\t"
"smull r4, r5, r0, r3\n\t"
"smlal r4, r5, r1, r2\n\t"
"subs %[len], %[len], #2\n\t"
"lsl r5, r5, #1\n\t"
"str r5, [%[dst0]], #4\n\t"
"1:\n\t"
"bgt 0b\n\t"
: [dst0] "+r" (dst0), [dst1] "+r" (dst1),
[src0] "+r" (src0), [src1] "+r" (src1),
[win0] "+r" (win0), [win1] "+r" (win1),
[len] "+r" (len)
:: "r0", "r1", "r2", "r3", "r4", "r5", "cc", "memory");
}
#endif
#ifndef _V_LSP_MATH_ASM
#define _V_LSP_MATH_ASM