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Code Issues Releases Activity

DCA: use a local variable for loop boundary

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This prevents gcc reloading the value from memory on each iteration
of the loop.

Originally committed as revision 22848 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-04-12 11:14:51 +00:00
parent 0dc7df28dd
commit b92d483bac
1 changed files with 2 additions and 1 deletions
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3
libavcodec/dca.c
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@ -757,6 +757,7 @@ static void qmf_32_subbands(DCAContext * s, int chans,
const float *prCoeff; const float *prCoeff;
int i; int i;
int sb_act = s->subband_activity[chans];
int subindex; int subindex;
scale *= sqrt(1/8.0); scale *= sqrt(1/8.0);
@ -770,7 +771,7 @@ static void qmf_32_subbands(DCAContext * s, int chans,
/* Reconstructed channel sample index */ /* Reconstructed channel sample index */
for (subindex = 0; subindex < 8; subindex++) { for (subindex = 0; subindex < 8; subindex++) {
/* Load in one sample from each subband and clear inactive subbands */ /* Load in one sample from each subband and clear inactive subbands */
for (i = 0; i < s->subband_activity[chans]; i++){ for (i = 0; i < sb_act; i++){
uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ ((i-1)&2)<<30; uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ ((i-1)&2)<<30;
AV_WN32A(&s->raXin[i], v); AV_WN32A(&s->raXin[i], v);
} }