2012-02-06  Jakub Jelinek  <jakub@redhat.com>

	PR debug/52132
	* reg-stack.c (subst_stack_regs_in_debug_insn): Don't use
	get_true_reg.

	* gcc.dg/pr52132.c: New test.

--- gcc/reg-stack.c.jj	2011-12-01 11:45:06.000000000 +0100
+++ gcc/reg-stack.c	2012-02-06 11:13:28.777795938 +0100
@@ -1323,14 +1323,10 @@ compare_for_stack_reg (rtx insn, stack r
 static int
 subst_stack_regs_in_debug_insn (rtx *loc, void *data)
 {
-  rtx *tloc = get_true_reg (loc);
   stack regstack = (stack)data;
   int hard_regno;
 
-  if (!STACK_REG_P (*tloc))
-    return 0;
-
-  if (tloc != loc)
+  if (!STACK_REG_P (*loc))
     return 0;
 
   hard_regno = get_hard_regnum (regstack, *loc);
--- gcc/testsuite/gcc.dg/pr52132.c.jj	2012-02-06 11:14:23.572547529 +0100
+++ gcc/testsuite/gcc.dg/pr52132.c	2012-02-06 11:14:46.656442861 +0100
@@ -0,0 +1,18 @@
+/* PR debug/52132 */
+/* { dg-do compile } */
+/* { dg-options "-std=c99 -O2 -g" } */
+
+int l;
+void bar (void);
+
+void
+foo (int *x, float y)
+{
+  float b;
+  union { float f; int i; } u = { .f = y };
+  u.i += 127 << 23;
+  u.f = ((-1.0f / 3) * u.f + 2) * u.f - 2.0f / 3;
+  b = 0.5 * (u.f + l);
+  if (b >= *x)
+    bar ();
+}