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| author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2016-03-06 21:25:11 +0100 |
|---|---|---|
| committer | Rostislav Pehlivanov <atomnuker@gmail.com> | 2016-03-28 16:56:27 +0100 |
| commit | b176ab0556914a734932e934a5e904dad091ad71 (patch) | |
| tree | 6279274be9cdba204bc1e82b188234f3c4b63082 | |
| parent | 1cbe4ff2acdd1f166ac7ac912c1b00da9fbf0dd1 (diff) | |
| download | ffmpeg-b176ab0556914a734932e934a5e904dad091ad71.tar.gz | |
aacenc_utils: Use temporary variable.
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)
| -rw-r--r-- | libavcodec/aacenc_utils.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavcodec/aacenc_utils.h b/libavcodec/aacenc_utils.h index b9bd6bf449..41a62961e1 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; } } |