[FFmpeg-devel] [PATCH/RFC] mathops/x86: work around inline asm miscompilation with GCC 4.8.1

Hendrik Leppkes h.leppkes at gmail.com
Sat Jun 15 22:46:01 CEST 2013


The volatile is not required here, and prevents a miscompilation with GCC
4.8.1 when building on x86 with --cpu=i686
---
 libavcodec/x86/mathops.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/x86/mathops.h b/libavcodec/x86/mathops.h
index e8eb274..9c48afe 100644
--- a/libavcodec/x86/mathops.h
+++ b/libavcodec/x86/mathops.h
@@ -74,7 +74,7 @@ static av_always_inline av_const int64_t MUL64(int a, int b)
 static inline av_const int mid_pred(int a, int b, int c)
 {
     int i=b;
-    __asm__ volatile(
+    __asm__ (
         "cmp    %2, %1 \n\t"
         "cmovg  %1, %0 \n\t"
         "cmovg  %2, %1 \n\t"
-- 
1.8.3.msysgit.0



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