[Bug tree-optimization/55970] [x86] Avoid reverse order of function argument gimplifying

[ysrumyan at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55970

--- Comment #5 from Yuri Rumyantsev <ysrumyan at gmail dot com> 2013-02-01 13:34:20 UTC ---
I sent for review a simple fix that can be considered as workaround for this
issue - I simply change macros

#define PUSH_ARGS_REVERSED TARGET_PUSH_ARGS

that allows user to preserve an order of function arguments evaluation if
"-mno-push-args" option was added to compile.

I also checked that adding that option will not affect on performance for
Corei7 and Atom platforms.

With modified gcc attached test is passed:

gcc -O2 t.c t_main.c -mno-push-args
./a.out
Test Passed