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authorReimar Döffinger <Reimar.Doeffinger@gmx.de>2011-08-28 21:14:13 +0200
committerCarl Eugen Hoyos <cehoyos@ag.or.at>2011-09-21 23:50:05 +0200
commitf36cea267381571488070d3d6b8290359f3f94d3 (patch)
tree176cf54dd8381c92e37bb9ce919d2a31c493028c
parentbf7dc6b29d785f149f18c39db021413e08735546 (diff)
downloadffmpeg-f36cea267381571488070d3d6b8290359f3f94d3.tar.gz
Hack around gcc 4.6 breaking asm using call.
gcc 4.6 no longer decrements esp to account for local variables. Thus using call will end up overwriting some local variable. So add an extra one it can safely clobber. This is a huge hack because it's basically pure chance it works, no idea how this is supposed to be done. Fixes trac ticket #397. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de> (cherry picked from commit c928e9172928f3cddab949b107dd53b6bf79555e)
-rw-r--r--libswscale/x86/swscale_template.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/libswscale/x86/swscale_template.c b/libswscale/x86/swscale_template.c
index 25399fadef..e715270714 100644
--- a/libswscale/x86/swscale_template.c
+++ b/libswscale/x86/swscale_template.c
@@ -2240,6 +2240,10 @@ static void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
#if defined(PIC)
DECLARE_ALIGNED(8, uint64_t, ebxsave);
#endif
+ // HACK: gcc 4.6 no longer decrements esp,
+ // use this to make it reserve space for the call
+ // return address
+ void *dummy;
__asm__ volatile(
#if defined(PIC)
@@ -2291,6 +2295,7 @@ static void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
#if defined(PIC)
,"m" (ebxsave)
#endif
+ ,"m" (dummy)
: "%"REG_a, "%"REG_c, "%"REG_d, "%"REG_S, "%"REG_D
#if !defined(PIC)
,"%"REG_b
@@ -2312,6 +2317,10 @@ static void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst1, int16_t *dst2,
#if defined(PIC)
DECLARE_ALIGNED(8, uint64_t, ebxsave);
#endif
+ // HACK: gcc 4.6 no longer decrements esp,
+ // use this to make it reserve space for the call
+ // return address
+ void *dummy;
__asm__ volatile(
#if defined(PIC)
@@ -2351,6 +2360,7 @@ static void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst1, int16_t *dst2,
#if defined(PIC)
,"m" (ebxsave)
#endif
+ ,"m" (dummy)
: "%"REG_a, "%"REG_c, "%"REG_d, "%"REG_S, "%"REG_D
#if !defined(PIC)
,"%"REG_b