arm.c (arm_gen_constant): Set can_negate correctly when code is SET.

2011-08-30  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/arm/arm.c (arm_gen_constant): Set can_negate correctly
	when code is SET.

From-SVN: r178319

gcc/ChangeLog

+2011-08-30  Andrew Stubbs  <ams@codesourcery.com>
+
+	* config/arm/arm.c (arm_gen_constant): Set can_negate correctly
+	when code is SET.
+
 2011-08-30  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/48571

gcc/config/arm/arm.c

@@ -3367,8 +3367,8 @@ arm_gen_constant (enum rtx_code code, enum machine_mode mode, rtx cond,
 
 	  if (code == SET)
 	    {
+	      can_negate = can_invert;
 	      can_invert = 0;
-	      can_negate = 1;
 	      code = PLUS;
 	    }
 	  else if (code == MINUS)