From 67a1f98c2c4b4f60df5150e350ea573cd401c612 Mon Sep 17 00:00:00 2001
From: Scott LaVarnway <slavarnway@google.com>
Date: Mon, 20 Jun 2011 14:44:16 -0400
Subject: [PATCH] Improved vp8dx_decode_bool
Relocated the vp8dx_bool_decoder_fill() call, allowing
the compiler to produce better assembly code. Tests
showed a 1 - 2 % performance boost (x86 using gcc)
for the 720p clip used.
Change-Id: Ic5a4eefed8777e6eefa007d4f12dfc7e64482732
---
vp8/decoder/dboolhuff.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/vp8/decoder/dboolhuff.h b/vp8/decoder/dboolhuff.h
index 5f6b211ea0..f729837f90 100644
--- a/vp8/decoder/dboolhuff.h
+++ b/vp8/decoder/dboolhuff.h
@@ -81,11 +81,14 @@ static int vp8dx_decode_bool(BOOL_DECODER *br, int probability) {
int count;
unsigned int range;
+ split = 1 + (((br->range - 1) * probability) >> 8);
+
+ if(br->count < 0)
+ vp8dx_bool_decoder_fill(br);
+
value = br->value;
count = br->count;
- range = br->range;
- split = 1 + (((range - 1) * probability) >> 8);
bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8);
range = split;
@@ -106,8 +109,7 @@ static int vp8dx_decode_bool(BOOL_DECODER *br, int probability) {
br->value = value;
br->count = count;
br->range = range;
- if(count < 0)
- vp8dx_bool_decoder_fill(br);
+
return bit;
}
--
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