re PR debug/52132 (ICE in loc_descriptor)

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

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

From-SVN: r184126

gcc/ChangeLog

+2012-02-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/52132
+	* reg-stack.c (subst_stack_regs_in_debug_insn): Don't use
+	get_true_reg.
+
 2012-02-11  Uros Bizjak  <ubizjak@gmail.com>
 
 	* compare-elim.c (find_comparisons_in_bb): Eliminate only compares

gcc/reg-stack.c

 /* Register to Stack convert for GNU compiler.
    Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010
+   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
    This file is part of GCC.
@@ -1323,14 +1323,10 @@ compare_for_stack_reg (rtx insn, stack regstack, rtx pat_src)
 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/ChangeLog

+2012-02-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/52132
+	* gcc.dg/pr52132.c: New test.
+
 2012-02-10  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/specs/aggr4.ads: New test.

gcc/testsuite/gcc.dg/pr52132.c

+/* 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 ();
+}