re PR target/51915 (ICE in output_move_double)

	PR target/51915
	* config/arm/arm.c (arm_count_output_move_double_insns): Call
	output_move_double on a copy of operands array.

	* gcc.target/arm/pr51915.c: New test.

From-SVN: r183349

gcc/ChangeLog

+2012-01-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/51915
+	* config/arm/arm.c (arm_count_output_move_double_insns): Call
+	output_move_double on a copy of operands array.
+
 2012-01-20   Cary Coutant  <ccoutant@google.com>
 	     Dodji Seketeli  <dodji@redhat.com>
 

gcc/config/arm/arm.c

@@ -24664,7 +24664,12 @@ int
 arm_count_output_move_double_insns (rtx *operands)
 {
   int count;
-  output_move_double (operands, false, &count);
+  rtx ops[2];
+  /* output_move_double may modify the operands array, so call it
+     here on a copy of the array.  */
+  ops[0] = operands[0];
+  ops[1] = operands[1];
+  output_move_double (ops, false, &count);
   return count;
 }
 

gcc/testsuite/ChangeLog

+2012-01-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/51915
+	* gcc.target/arm/pr51915.c: New test.
+
 2012-01-20   Cary Coutant  <ccoutant@google.com>
 	     Dodji Seketeli  <dodji@redhat.com>
 

gcc/testsuite/gcc.target/arm/pr51915.c

+/* PR target/51915 */
+/* { dg-do compile } */
+/* { dg-options "-march=armv7-a -mfloat-abi=hard -O2" } */
+
+struct S { int s1; void *s2; };
+struct T { struct S t1; unsigned long long t2; };
+struct S *foo (unsigned long long);
+
+struct S *
+bar (struct S *x)
+{
+  return foo (((struct T *) x)->t2);
+}