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x86: fix overflow in h264 8x8 planar prediction
author
Mans Rullgard
<mans@mansr.com>
Mon, 24 Jan 2011 23:24:28 +0000
(23:24 +0000)
committer
Mans Rullgard
<mans@mansr.com>
Mon, 24 Jan 2011 23:24:28 +0000
(23:24 +0000)
Signed-off-by: Mans Rullgard <mans@mansr.com>
libavcodec/x86/h264_intrapred.asm
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diff --git
a/libavcodec/x86/h264_intrapred.asm
b/libavcodec/x86/h264_intrapred.asm
index
dbe6b8a
..
28c2f39
100644
(file)
--- a/
libavcodec/x86/h264_intrapred.asm
+++ b/
libavcodec/x86/h264_intrapred.asm
@@
-637,10
+637,6
@@
cglobal pred8x8_plane_%1, 2, 7, %2
%endif
paddw m0, m1 ; sum of H coefficients
- pmullw m0, [pw_17]
- paddw m0, [pw_16]
- psraw m0, 5
-
lea r4, [r0+r2*4-1]
lea r3, [r0 -1]
add r4, r2
@@
-694,6
+690,10
@@
cglobal pred8x8_plane_%1, 2, 7, %2
shl r3, 4
movd r1d, m0
movsx r1d, r1w
+ imul r1d, 17
+ add r1d, 16
+ sar r1d, 5
+ movd m0, r1d
add r1d, r5d
sub r3d, r1d
add r1d, r1d