devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

SPC Codec: Add ARMv5 optimized code. Easy peasy.

Browse source 
Why? Why not? Cuts a few MHz.

Change-Id: Ied5c70b1aedd255cbe5d42b7d3028bbe47aad01d
This commit is contained in:
Michael Sevakis 2013-05-22 18:50:28 -04:00
parent 7738660eff
commit 33f3af2b8d
4 changed files with 291 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

13
lib/rbcodec/codecs/libspc/spc_dsp.c
View file

@ -32,6 +32,8 @@
#if defined(CPU_ARM)
#if ARM_ARCH >= 6
#include "cpu/spc_dsp_armv6.c"
#elif ARM_ARCH >= 5
#include "cpu/spc_dsp_armv5.c"
#else
#include "cpu/spc_dsp_armv4.c"
#endif
@ -55,7 +57,7 @@ static unsigned short const env_rates [0x20] ICONST_ATTR_SPC =
#if !SPC_NOINTERP
/* Interleved gauss table (to improve cache coherency). */
/* gauss [i * 2 + j] = normal_gauss [(1 - j) * 256 + i] */
static int16_t const gauss_table [512] ICONST_ATTR_SPC MEM_ALIGN_ATTR =
static int16_t gauss_table [512] IDATA_ATTR_SPC MEM_ALIGN_ATTR =
{
370,1305, 366,1305, 362,1304, 358,1304,
354,1304, 351,1304, 347,1304, 343,1303,
@ -956,6 +958,15 @@ void DSP_reset( struct Spc_Dsp* this )
this->wave_entry [i].start_addr = 0xffff;
#endif /* SPC_BRRCACHE */
#if !SPC_NOINTERP && GAUSS_TABLE_SCALE
if (gauss_table[0] == 370)
{
/* Not yet scaled */
for ( int i = 0; i < 512; i++)
gauss_table[i] <<= GAUSS_TABLE_SCALE;
}
#endif /* !SPC_NOINTERP && GAUSS_TABLE_SCALE */
#if !SPC_NOECHO
this->echo_pos = 0;
echo_init(this);