arm.c (arm_no_early_mul_dep): Handle multiply-subtract.

2008-09-01  Paul Brook  <paul@codesourcery.com>

	gcc/
	* config/arm/arm.c (arm_no_early_mul_dep): Handle multiply-subtract.

From-SVN: r139860

gcc/ChangeLog

+2008-09-01  Paul Brook  <paul@codesourcery.com>
+
+	* config/arm/arm.c (arm_no_early_mul_dep): Handle multiply-subtract.
+
 2008-00-01  Jan Hubicka  <jh@suse.cz>
 
 	* config/spu/spu.c (spu_expand_block_move) Update call of MOVE_RATIO.

gcc/config/arm/arm.c

@@ -18235,8 +18235,15 @@ arm_no_early_mul_dep (rtx producer, rtx consumer)
     op = XVECEXP (op, 0, 0);
   op = XEXP (op, 1);
 
-  return (GET_CODE (op) == PLUS
-	  && !reg_overlap_mentioned_p (value, XEXP (op, 0)));
+  if (GET_CODE (op) == PLUS || GET_CODE (op) == MINUS)
+    {
+      if (GET_CODE (XEXP (op, 0)) == MULT)
+	return !reg_overlap_mentioned_p (value, XEXP (op, 0));
+      else
+	return !reg_overlap_mentioned_p (value, XEXP (op, 1));
+    }
+
+  return 0;
 }
 
 /* We can't rely on the caller doing the proper promotion when