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g723.1: do not bounce intermediate values via memory

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Although a reasonable compiler will probably optimise out the
actual store and load, this operation still implies a truncation
to 16 bits which the compiler will probably not realise is not
necessary here.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-08-11 21:00:21 +01:00
parent cbcf1b411f
commit 138914dcd8
1 changed files with 2 additions and 3 deletions
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5
libavcodec/g723_1.c
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@ -1064,9 +1064,8 @@ static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
p->cur_rate);
/* Get the total excitation */
for (j = 0; j < SUBFRAME_LEN; j++) {
vector_ptr[j] = av_clip_int16(vector_ptr[j] << 1);
vector_ptr[j] = av_clip_int16(vector_ptr[j] +
acb_vector[j]);
int v = av_clip_int16(vector_ptr[j] << 1);
vector_ptr[j] = av_clip_int16(v + acb_vector[j]);
}
vector_ptr += SUBFRAME_LEN;
}