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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>
This commit is contained in:
Reimar Döffinger
2016-03-06 21:25:11 +01:00
parent b91e376390
commit b60dfae7af
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; int i;
for (i = 0; i < size; i++) { for (i = 0; i < size; i++) {
float qc = scaled[i] * Q34; 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) { if (is_signed && in[i] < 0.0f) {
out[i] = -out[i]; tmp = -tmp;
} }
out[i] = tmp;
} }
} }