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aacenc_utils: Use temporary variable.

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This ensures gcc does not create unnecessary
loads or stores and possibly even does not vectorize
the negation.
Speeds up mp3 to aac transcoding with default settings
by 10% when using "gcc (Debian 5.3.1-10) 5.3.1 20160224".

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
(cherry picked from commit b60dfae7af65c4c7d255ef599352f2c54964303d)
This commit is contained in:
Reimar Döffinger 2016-03-06 21:25:11 +01:00 committed by Rostislav Pehlivanov
parent 1cbe4ff2ac
commit b176ab0556
1 changed files with 3 additions and 2 deletions
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5
libavcodec/aacenc_utils.h
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@ -68,10 +68,11 @@ static inline void quantize_bands(int *out, const float *in, const float *scaled
int i;
for (i = 0; i < size; i++) {
float qc = scaled[i] * Q34;
out[i] = (int)FFMIN(qc + rounding, (float)maxval);
int tmp = (int)FFMIN(qc + rounding, (float)maxval);
if (is_signed && in[i] < 0.0f) {
out[i] = -out[i];
tmp = -tmp;
}
out[i] = tmp;
}
}