From f21fb76b1be18036c93c3e29fe1889a9fabf30b3 Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Tue, 21 Jun 2011 16:14:19 -0400
Subject: ac3enc: remove a branch in asym_quant() by doing 2 shifts

---
 libavcodec/ac3enc.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

(limited to 'libavcodec/ac3enc.c')

diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 1db69414a5..db45c8360e 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -1123,15 +1123,9 @@ static inline int sym_quant(int c, int e, int levels)
  */
 static inline int asym_quant(int c, int e, int qbits)
 {
-    int lshift, m, v;
+    int m, v;
 
-    lshift = e + qbits - 24;
-    if (lshift >= 0)
-        v = c << lshift;
-    else
-        v = c >> (-lshift);
-    /* rounding */
-    v = (v + 1) >> 1;
+    v = (((c << e) >> (24 - qbits)) + 1) >> 1;
     m = (1 << (qbits-1));
     if (v >= m)
         v = m - 1;
-- 
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