From c3806c1e1e0c9895d17d729a96179f71f124857e Mon Sep 17 00:00:00 2001
From: rsandifo <rsandifo@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sun, 29 May 2011 17:48:14 +0000
Subject: [PATCH] gcc/
 	* config/mips/mips.c (mips_cfun_call_saved_reg_p): Handle global
 	registers.

gcc/testsuite/
	* gcc.target/mips/reg-var-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@174405 138bc75d-0d04-0410-961f-82ee72b054a4

index 027fc2d..8069a0b 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -9053,6 +9053,11 @@ mips_interrupt_extra_call_saved_reg_p (unsigned int regno)
 static bool
 mips_cfun_call_saved_reg_p (unsigned int regno)
 {
+  /* If the user makes an ordinarily-call-saved register global,
+     that register is no longer call-saved.  */
+  if (global_regs[regno])
+    return false;
+
   /* Interrupt handlers need to save extra registers.  */
   if (cfun->machine->interrupt_handler_p
       && mips_interrupt_extra_call_saved_reg_p (regno))
new file mode 100644
index 0000000..d8b8118
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/reg-var-1.c
@@ -0,0 +1,16 @@
+/* { dg-do run } */
+register int g asm ("$18");
+
+void __attribute__((noinline))
+test (void)
+{
+  g = g + 1;
+}
+
+int
+main (void)
+{
+  g = 2;
+  test ();
+  return g != 3;
+}
-- 
1.7.0.4