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Vorbis optimizations: allocation of PCM buffers in IRAM, avoiding copying.

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Slight code improvements to the MDCT functions.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6590 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Pedro Vasconcelos 2005-06-06 23:01:51 +00:00
parent 127f14210f
commit 0f10e898f0
11 changed files with 110 additions and 132 deletions
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72
apps/codecs/Tremor/mdct.c
View file

@ -41,7 +41,6 @@
/* 8 point butterfly (in place) */
STIN void mdct_butterfly_8(DATA_TYPE *x){
REG_TYPE r0 = x[4] + x[0];
REG_TYPE r1 = x[4] - x[0];
REG_TYPE r2 = x[5] + x[1];
@ -144,88 +143,81 @@ STIN void mdct_butterfly_32(DATA_TYPE *x){
mdct_butterfly_16(x+16);
}
/* N/stage point generic N stage butterfly (in place, 2 register) */
STIN void mdct_butterfly_generic(DATA_TYPE *x,int points,int step){
/* N/stage point generic N stage butterfly (in place, 4 register) */
void mdct_butterfly_generic(DATA_TYPE *x,int points, int step){
LOOKUP_T *T = sincos_lookup0;
DATA_TYPE *x1 = x + points - 8;
DATA_TYPE *x2 = x + (points>>1) - 8;
REG_TYPE r0;
REG_TYPE r1;
REG_TYPE r2;
REG_TYPE r3;
do{
r0 = x1[6] - x2[6]; x1[6] += x2[6];
r1 = x2[7] - x1[7]; x1[7] += x2[7];
r2 = x1[4] - x2[4]; x1[4] += x2[4];
r3 = x2[5] - x1[5]; x1[5] += x2[5];
XPROD31( r1, r0, T[0], T[1], &x2[6], &x2[7] ); T+=step;
r0 = x1[4] - x2[4]; x1[4] += x2[4];
r1 = x2[5] - x1[5]; x1[5] += x2[5];
XPROD31( r1, r0, T[0], T[1], &x2[4], &x2[5] ); T+=step;
XPROD31( r3, r2, T[0], T[1], &x2[4], &x2[5] ); T+=step;
r0 = x1[2] - x2[2]; x1[2] += x2[2];
r1 = x2[3] - x1[3]; x1[3] += x2[3];
r2 = x1[0] - x2[0]; x1[0] += x2[0];
r3 = x2[1] - x1[1]; x1[1] += x2[1];
XPROD31( r1, r0, T[0], T[1], &x2[2], &x2[3] ); T+=step;
r0 = x1[0] - x2[0]; x1[0] += x2[0];
r1 = x2[1] - x1[1]; x1[1] += x2[1];
XPROD31( r1, r0, T[0], T[1], &x2[0], &x2[1] ); T+=step;
XPROD31( r3, r2, T[0], T[1], &x2[0], &x2[1] ); T+=step;
x1-=8; x2-=8;
}while(T<sincos_lookup0+1024);
do{
r0 = x1[6] - x2[6]; x1[6] += x2[6];
r1 = x1[7] - x2[7]; x1[7] += x2[7];
r2 = x1[4] - x2[4]; x1[4] += x2[4];
r3 = x1[5] - x2[5]; x1[5] += x2[5];
XNPROD31( r0, r1, T[0], T[1], &x2[6], &x2[7] ); T-=step;
XNPROD31( r2, r3, T[0], T[1], &x2[4], &x2[5] ); T-=step;
r0 = x1[4] - x2[4]; x1[4] += x2[4];
r1 = x1[5] - x2[5]; x1[5] += x2[5];
XNPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T-=step;
r0 = x1[2] - x2[2]; x1[2] += x2[2];
r1 = x1[3] - x2[3]; x1[3] += x2[3];
r2 = x1[0] - x2[0]; x1[0] += x2[0];
r3 = x1[1] - x2[1]; x1[1] += x2[1];
XNPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T-=step;
r0 = x1[0] - x2[0]; x1[0] += x2[0];
r1 = x1[1] - x2[1]; x1[1] += x2[1];
XNPROD31( r0, r1, T[0], T[1], &x2[0], &x2[1] ); T-=step;
XNPROD31( r2, r3, T[0], T[1], &x2[0], &x2[1] ); T-=step;
x1-=8; x2-=8;
}while(T>sincos_lookup0);
do{
r0 = x2[6] - x1[6]; x1[6] += x2[6];
r1 = x2[7] - x1[7]; x1[7] += x2[7];
r2 = x2[4] - x1[4]; x1[4] += x2[4];
r3 = x2[5] - x1[5]; x1[5] += x2[5];
XPROD31( r0, r1, T[0], T[1], &x2[6], &x2[7] ); T+=step;
r0 = x2[4] - x1[4]; x1[4] += x2[4];
r1 = x2[5] - x1[5]; x1[5] += x2[5];
XPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T+=step;
XPROD31( r2, r3, T[0], T[1], &x2[4], &x2[5] ); T+=step;
r0 = x2[2] - x1[2]; x1[2] += x2[2];
r1 = x2[3] - x1[3]; x1[3] += x2[3];
r2 = x2[0] - x1[0]; x1[0] += x2[0];
r3 = x2[1] - x1[1]; x1[1] += x2[1];
XPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T+=step;
r0 = x2[0] - x1[0]; x1[0] += x2[0];
r1 = x2[1] - x1[1]; x1[1] += x2[1];
XPROD31( r0, r1, T[0], T[1], &x2[0], &x2[1] ); T+=step;
XPROD31( r2, r3, T[0], T[1], &x2[0], &x2[1] ); T+=step;
x1-=8; x2-=8;
}while(T<sincos_lookup0+1024);
do{
r0 = x1[6] - x2[6]; x1[6] += x2[6];
r1 = x2[7] - x1[7]; x1[7] += x2[7];
r2 = x1[4] - x2[4]; x1[4] += x2[4];
r3 = x2[5] - x1[5]; x1[5] += x2[5];
XNPROD31( r1, r0, T[0], T[1], &x2[6], &x2[7] ); T-=step;
r0 = x1[4] - x2[4]; x1[4] += x2[4];
r1 = x2[5] - x1[5]; x1[5] += x2[5];
XNPROD31( r1, r0, T[0], T[1], &x2[4], &x2[5] ); T-=step;
XNPROD31( r3, r2, T[0], T[1], &x2[4], &x2[5] ); T-=step;
r0 = x1[2] - x2[2]; x1[2] += x2[2];
r1 = x2[3] - x1[3]; x1[3] += x2[3];
r2 = x1[0] - x2[0]; x1[0] += x2[0];
r3 = x2[1] - x1[1]; x1[1] += x2[1];
XNPROD31( r1, r0, T[0], T[1], &x2[2], &x2[3] ); T-=step;
r0 = x1[0] - x2[0]; x1[0] += x2[0];
r1 = x2[1] - x1[1]; x1[1] += x2[1];
XNPROD31( r1, r0, T[0], T[1], &x2[0], &x2[1] ); T-=step;
XNPROD31( r3, r2, T[0], T[1], &x2[0], &x2[1] ); T-=step;
x1-=8; x2-=8;
}while(T>sincos_lookup0);
@ -246,8 +238,8 @@ STIN void mdct_butterflies(DATA_TYPE *x,int points,int shift) {
}
static const unsigned char bitrev[16]
IDATA_ATTR = {0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
static const unsigned char bitrev[16] IDATA_ATTR =
{0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
STIN int bitrev12(int x){
return bitrev[x>>8]|(bitrev[(x&0x0f0)>>4]<<4)|(((int)bitrev[x&0x00f])<<8);