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libtremor: small tweak to cf channel coupling asm, speeding up vorbis decoding by ~0.1MHz. Drop unused macro params and add some comments.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30558 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2011-09-16 12:51:22 +00:00
parent 9d7df9ae4d
commit bcfb2b53eb
1 changed files with 16 additions and 13 deletions
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29
apps/codecs/libtremor/mapping0.c
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@ -228,23 +228,25 @@ static inline void channel_couple(ogg_int32_t *pcmM, ogg_int32_t *pcmA, int n)
#elif defined CPU_COLDFIRE
#define MAGANG( _mag, _ang, _pcmA, _pcmM, _off )\
#define MAGANG( _mag, _ang, _off )\
{\
int temp;\
asm volatile( "move.l %[ang], %[temp]\n\t"\
"tst.l %[mag]\n\t"\
asm volatile( "tst.l %[mag]\n\t"\
"bgt.s 1f\n\t"\
"neg.l %[temp]\n\t"\
"neg.l %[ang]\n\t" /* neg sets cc so we might as well jump */ \
"ble.s 2f\n\t"\
".word 0x51fb\n\t" /* trapf.l, shadow next 2 insns */ \
/* if we didn't jump, the next test will */ \
/* false anyway */ \
"1:\n\t"\
"tst.l %[ang]\n\t"\
"bgt.s 2f\n\t"\
"add.l %[mag], %[temp]\n\t"\
"move.l %[temp], (" #_off ", %[pcmM])\n\t"\
"add.l %[mag], %[ang]\n\t"\
"move.l %[ang], (" #_off ", %[pcmM])\n\t"\
".word 0x51fa\n\t" /* trapf.w, shadow next insn */ \
"2:\n\t"\
"sub.l %[temp], %[mag]\n\t"\
"sub.l %[ang], %[mag]\n\t"\
"move.l %[mag], (%[pcmA])+\n\t"\
: [mag] "+r" ( ( _mag ) ), [ang] "+d" ( ( _ang ) ), [temp] "=&d" (temp),\
: [mag] "+r" ( ( _mag ) ), [ang] "+d" ( ( _ang ) ),\
[pcmA] "+a" (pcmA)\
: [pcmM] "a" (pcmM)\
: "cc", "memory" );\
@ -262,10 +264,11 @@ static inline void channel_couple(ogg_int32_t *pcmM, ogg_int32_t *pcmA, unsigned
[A0] "=r" (A0), [A1] "=r" (A1), [A2] "=r" (A2), [A3] "=r" (A3)
: [pcmM] "a" (pcmM), [pcmA] "a" (pcmA) );
MAGANG( M0, A0, pcmA, pcmM, 0 );
MAGANG( M1, A1, pcmA, pcmM, 4 );
MAGANG( M2, A2, pcmA, pcmM, 8 );
MAGANG( M3, A3, pcmA, pcmM, 12 );
/* use offsets instead of autoinc since the store to pcmM is conditional */
MAGANG( M0, A0, 0 );
MAGANG( M1, A1, 4 );
MAGANG( M2, A2, 8 );
MAGANG( M3, A3, 12 );
asm volatile( "lea.l (4*4, %[pcmM]), %[pcmM]\n\t"
: [pcmM] "+a" (pcmM));