[x264-devel] commit: Use -fno-tree-vectorize to avoid miscompilation ( Jason Garrett-Glaser )

[git at videolan.org]

x264 | branch: stable | Jason Garrett-Glaser <darkshikari at gmail.com> | Tue Jun 22 14:20:46 2010 -0700| [4c27afb595ac8e8a621ffc2bf8120f0d43c80384] | committer: Jason Garrett-Glaser 

Use -fno-tree-vectorize to avoid miscompilation
Some versions of gcc have been reported to attempt (and fail) to vectorize a loop in plane_expand_border.
This results in a segfault, so to limit the possible effects of gcc's utter incompetence, we're turning off vectorization entirely.
It's not like it ever did anything useful to begin with.

> http://git.videolan.org/gitweb.cgi/x264.git/?a=commit;h=4c27afb595ac8e8a621ffc2bf8120f0d43c80384
---

 configure |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 3a38cb5..24d15ad 100755
--- a/configure
+++ b/configure
@@ -628,6 +628,10 @@ else
     CFLAGS="-O3 -ffast-math $CFLAGS"
 fi
 
+if cc_check '' -fno-tree-vectorize ; then
+    CFLAGS="$CFLAGS -fno-tree-vectorize"
+fi
+
 if cc_check "stdio.h" "" "fseeko(stdin,0,0);" ; then
     define fseek fseeko
     define ftell ftello