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Unroll and optimise channel coupling for arm gives 0.6Mhz speed for vorbis on pp(ipod video)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24808 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Hooper 2010-02-21 15:36:35 +00:00
parent dafcd1470a
commit a3068ca863
1 changed files with 68 additions and 23 deletions
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91
apps/codecs/libtremor/mapping0.c
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@ -178,7 +178,73 @@ static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb)
return(NULL);
}
// static int seq = 0;
#ifdef CPU_ARM
#define MAGANG( _mag, _ang )\
{\
register int temp;\
asm( "cmp %[mag], #0\n\t"\
"cmpgt %[ang], #0\n\t"\
"subgt %[temp], %[mag], %[ang]\n\t"\
"bgt 1f\n\t"\
"cmp %[mag], #0\n\t"\
"cmple %[ang], #0\n\t"\
"addgt %[temp], %[mag], %[ang]\n\t"\
"suble %[temp], %[mag], %[ang]\n\t"\
"1: cmp %[ang], #0\n\t"\
"movle %[ang], %[mag]\n\t"\
"movle %[mag], %[temp]\n\t"\
"movgt %[ang], %[temp]\n\t"\
: [mag] "+r" ( ( _mag ) ), [ang] "+r" ( ( _ang ) ), [temp] "=&r" (temp)\
:\
: "cc" );\
}
static inline void channel_couple(ogg_int32_t *pcmM, ogg_int32_t *pcmA, int n)
{
ogg_int32_t * const pcmMend = pcmM + n/2;
while(LIKELY(pcmM < pcmMend))
{
register int M0 asm("r2"),M1 asm("r3"),M2 asm("r4"),M3 asm("r5");
register int A0 asm("r6"),A1 asm("r7"),A2 asm("r8"),A3 asm("r9");
asm volatile( "ldmia %[pcmM], {%[M0], %[M1], %[M2], %[M3]}\n\t"
"ldmia %[pcmA], {%[A0], %[A1], %[A2], %[A3]}\n\t"
: [M0] "=r" (M0), [M1] "=r" (M1), [M2] "=r" (M2), [M3] "=r" (M3),
[A0] "=r" (A0), [A1] "=r" (A1), [A2] "=r" (A2), [A3] "=r" (A3)
: [pcmM] "r" (pcmM), [pcmA] "r" (pcmA) );
MAGANG( M0, A0 );
MAGANG( M1, A1 );
MAGANG( M2, A2 );
MAGANG( M3, A3 );
asm volatile( "stmia %[pcmM]!, {%[M0], %[M1], %[M2], %[M3]}\n\t"
"stmia %[pcmA]!, {%[A0], %[A1], %[A2], %[A3]}\n\t"
: [pcmM] "+r" (pcmM), [pcmA] "+r" (pcmA)
: [M0] "r" (M0), [M1] "r" (M1), [M2] "r" (M2), [M3] "r" (M3),
[A0] "r" (A0), [A1] "r" (A1), [A2] "r" (A2), [A3] "r" (A3) );
}
}
#else
static inline void channel_couple(ogg_int32_t *pcmM, ogg_int32_t *pcmA, int n)
{
int j;
for(j=0;j<n/2;j++){
ogg_int32_t mag = pcmM[j], ang = pcmA[j];
if(mag>0)
if(ang>0)
pcmA[j]=mag-ang;
else{
pcmA[j]=mag;
pcmM[j]=mag+ang;
}
else
if(ang>0)
pcmA[j]=mag+ang;
else{
pcmA[j]=mag;
pcmM[j]=mag-ang;
}
}
}
#endif
static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
vorbis_dsp_state *vd=vb->vd;
@ -249,28 +315,7 @@ static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
for(i=info->coupling_steps-1;i>=0;i--){
ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]];
ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]];
for(j=0;j<n/2;j++){
ogg_int32_t mag=pcmM[j];
ogg_int32_t ang=pcmA[j];
if(mag>0)
if(ang>0){
pcmM[j]=mag;
pcmA[j]=mag-ang;
}else{
pcmA[j]=mag;
pcmM[j]=mag+ang;
}
else
if(ang>0){
pcmM[j]=mag;
pcmA[j]=mag+ang;
}else{
pcmA[j]=mag;
pcmM[j]=mag-ang;
}
}
channel_couple(pcmM,pcmA,n);
}
//for(j=0;j<vi->channels;j++)