re PR middle-end/49029 (ICE in simplify_subreg, at simplify-rtx.c:5266)

	PR middle-end/49029
	* expmed.c (extract_fixed_bit_field): Test whether target can be used
	only after deciding which mode to use.

	* gcc.c-torture/compile/pr49029.c: New test.

From-SVN: r174034

gcc/ChangeLog

+2011-05-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/49029
+	* expmed.c (extract_fixed_bit_field): Test whether target can be used
+	only after deciding which mode to use.
+
 2011-05-22  Tom de Vries  <tom@codesourcery.com>
 
 	PR target/45098

gcc/expmed.c

@@ -1769,8 +1769,6 @@ extract_fixed_bit_field (enum machine_mode tmode, rtx op0,
   /* To extract a signed bit-field, first shift its msb to the msb of the word,
      then arithmetic-shift its lsb to the lsb of the word.  */
   op0 = force_reg (mode, op0);
-  if (mode != tmode)
-    target = 0;
 
   /* Find the narrowest integer mode that contains the field.  */
 
@@ -1782,6 +1780,9 @@ extract_fixed_bit_field (enum machine_mode tmode, rtx op0,
 	break;
       }
 
+  if (mode != tmode)
+    target = 0;
+
   if (GET_MODE_BITSIZE (mode) != (bitsize + bitpos))
     {
       int amount = GET_MODE_BITSIZE (mode) - (bitsize + bitpos);

gcc/testsuite/ChangeLog

+2011-05-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/49029
+	* gcc.c-torture/compile/pr49029.c: New test.
+
 2011-05-22  Jason Merrill  <jason@redhat.com>
 
 	* g++.dg/cpp0x/sfinae23.C: New.

gcc/testsuite/gcc.c-torture/compile/pr49029.c

+/* PR middle-end/49029 */
+struct S { volatile unsigned f : 11; signed g : 30; } __attribute__((packed));
+struct T { volatile struct S h; } __attribute__((packed)) a;
+void foo (int);
+
+void
+bar ()
+{
+  foo (a.h.g);
+}