re PR debug/46893 (ICE: in trunc_int_for_mode, at explow.c:56 with -O -g)

	PR debug/46893
	* cfgexpand.c (expand_debug_expr): If GET_MODE (op0) is VOIDmode,
	use TYPE_MODE (TREE_TYPE (tem)) instead of mode1.

	* gcc.dg/pr46893.c: New test.

From-SVN: r167949

gcc/ChangeLog

+2010-12-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/46893
+	* cfgexpand.c (expand_debug_expr): If GET_MODE (op0) is VOIDmode,
+	use TYPE_MODE (TREE_TYPE (tem)) instead of mode1.
+
 2010-12-16  Chung-Lin Tang  <cltang@codesourcery.com>
 
 	PR target/46883

gcc/cfgexpand.c

@@ -2703,7 +2703,7 @@ expand_debug_expr (tree exp)
 	    enum machine_mode opmode = GET_MODE (op0);
 
 	    if (opmode == VOIDmode)
-	      opmode = mode1;
+	      opmode = TYPE_MODE (TREE_TYPE (tem));
 
 	    /* This condition may hold if we're expanding the address
 	       right past the end of an array that turned out not to
@@ -2724,7 +2724,8 @@ expand_debug_expr (tree exp)
 				     ? SIGN_EXTRACT
 				     : ZERO_EXTRACT, mode,
 				     GET_MODE (op0) != VOIDmode
-				     ? GET_MODE (op0) : mode1,
+				     ? GET_MODE (op0)
+				     : TYPE_MODE (TREE_TYPE (tem)),
 				     op0, GEN_INT (bitsize), GEN_INT (bitpos));
       }
 

gcc/testsuite/ChangeLog

+2010-12-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/46893
+	* gcc.dg/pr46893.c: New test.
+
 2010-12-16  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR lto/46976

gcc/testsuite/gcc.dg/pr46893.c

+/* PR debug/46893 */
+/* { dg-do compile } */
+/* { dg-options "-O -g" } */
+
+void
+foo (void)
+{
+  union { unsigned long long l; double d; } u = { 0x7ff0000000000000ULL };
+  double v = 0, w = -u.d;
+
+  if (w)
+    w = v;
+}