I committed the following patch as obvious fix.
Index: ChangeLog =================================================================== Index: config/i386/i386.c =================================================================== davidxl@aples2:../tot/gcc\>> svn diff Index: config/i386/i386.c =================================================================== --- config/i386/i386.c (revision 201732) +++ config/i386/i386.c (working copy) @@ -2815,7 +2815,7 @@ ix86_parse_stringop_strategy_string (cha do { - int mins, maxs; + int mins = 0, maxs; stringop_alg alg; char alg_name[128]; char align[16]; Index: ChangeLog =================================================================== --- ChangeLog (revision 201732) +++ ChangeLog (working copy) @@ -1,4 +1,8 @@ 2013-08-14 Xinliang David Li <davi...@google.com> + * config/i386/i386.c (ix86_option_override_internal): + Fix potential unitialized variable error. + +2013-08-14 Xinliang David Li <davi...@google.com> * config/i386/i386.opt: Define two new options. * config/i386/x86-tune.def: Add arch selector field in macros.