[PATCH, i386]: Fix PR55224, FAIL: gcc.target/i386/tailcall-1.c scan-assembler jmp

[Uros Bizjak]

Hello!

Apparently, vzeroupper patch removed a couple of unrelated lines.
Attached patch puts back what was there in gcc-4.5.

(Also, the patch finds a better place for check_avx256_stores.)

2012-11-07  Uros Bizjak  <ubiz...@gmail.com>

        PR target/55224
        * config/i386/i386.c (ix86_function_ok_for_sibcall): Put back exception
        to make a sibcall if one of the functions has void return type.

Patch was tested on x86_64-pc-linux-gnu {,-m32} and committed to mainline SVN.

Uros.

Index: i386.c
===================================================================
--- i386.c      (revision 193296)
+++ i386.c      (working copy)
@@ -4638,6 +4622,8 @@ ix86_function_ok_for_sibcall (tree decl, tree exp)
       if (!rtx_equal_p (a, b))
        return false;
     }
+  else if (VOID_TYPE_P (TREE_TYPE (DECL_RESULT (cfun->decl))))
+    ;
   else if (!rtx_equal_p (a, b))
     return false;