re PR middle-end/37731 (long long may not work correctly on 32bit host)

gcc/

2008-10-07  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/37731
	* expmed.c (expand_mult): Properly check DImode constant in
	CONST_DOUBLE.

gcc/testsuite/

2008-10-07  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/37731
	* gcc.dg/torture/pr37731-1.c: New.
	* gcc.dg/torture/pr37731-2.c: Likewise.

From-SVN: r140947

gcc/ChangeLog

+2008-10-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR middle-end/37731
+	* expmed.c (expand_mult): Properly check DImode constant in
+	CONST_DOUBLE.
+
 2008-10-07  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/37738

gcc/expmed.c

@@ -3075,7 +3075,8 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
 	{
 	  /* If we are multiplying in DImode, it may still be a win
 	     to try to work with shifts and adds.  */
-	  if (CONST_DOUBLE_HIGH (op1) == 0)
+	  if (CONST_DOUBLE_HIGH (op1) == 0
+	      && CONST_DOUBLE_LOW (op1) > 0)
 	    coeff = CONST_DOUBLE_LOW (op1);
 	  else if (CONST_DOUBLE_LOW (op1) == 0
 		   && EXACT_POWER_OF_2_OR_ZERO_P (CONST_DOUBLE_HIGH (op1)))

gcc/testsuite/ChangeLog

+2008-10-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR middle-end/37731
+	* gcc.dg/torture/pr37731-1.c: New.
+	* gcc.dg/torture/pr37731-2.c: Likewise.
+
 2008-10-07  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/37738

gcc/testsuite/gcc.dg/torture/pr37731-1.c

+/* { dg-do run } */
+
+extern void abort ();
+
+unsigned long long xh = 1;
+
+int
+main ()
+{
+  unsigned long long yh = 0xffffffffull;
+  unsigned long long z = xh * yh;
+
+  if (z != yh)
+    abort ();
+
+  return 0;
+}

gcc/testsuite/gcc.dg/torture/pr37731-2.c

+/* { dg-do run } */
+
+extern void abort ();
+
+long long xh = 1;
+
+int
+main ()
+{
+  long long yh = 0xffffffffll;
+  long long z = xh * yh;
+
+  if (z != yh)
+    abort ();
+
+  return 0;
+}