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.doeffin...@gmx.de>
---
libavcodec/aacenc_utils.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/aacenc_utils.h b/libavcodec/aacenc_utils.h
index b9bd6bf..41a6296 100644
--- a/libavcodec/aacenc_utils.h
+++ b/libavcodec/aacenc_utils.h
@@ -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;
}
}
--
2.7.0
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