From 0bc7ce3b0477fd0da3e4158dde50e91681e3a790 Mon Sep 17 00:00:00 2001
From: reimar <reimar@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sun, 18 Nov 2007 17:28:27 +0000
Subject: Rearrange scaletempo inner loop. Speedup on x86 with gcc 3.4 36%, on
 x86_64 with gcc 4.1 5%

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25100 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libaf/af_scaletempo.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'libaf')

diff --git a/libaf/af_scaletempo.c b/libaf/af_scaletempo.c
index b2de4c33ef..d4c3fe731e 100644
--- a/libaf/af_scaletempo.c
+++ b/libaf/af_scaletempo.c
@@ -170,9 +170,12 @@ static int best_overlap_offset_s16(af_scaletempo_t* s)
     int32_t corr = 0;
     int16_t* ps = search_start;
     ppc = s->buf_pre_corr;
-    for (i=s->num_channels; i<s->samples_overlap; i++) {
+    ppc += s->samples_overlap - s->num_channels;
+    ps  += s->samples_overlap - s->num_channels;
+    i  = -(s->samples_overlap - s->num_channels);
+    do {
       corr += ( *ppc++ * *ps++ ) >> s->shift_corr;
-    }
+    } while (++i < 0);
     if (corr > best_corr) {
       best_corr = corr;
       best_off  = off;
-- 
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