From: sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sat, 3 Apr 2004 20:05:40 +0000 (+0000)
Subject: 	* fold-const.c (fold) <PLUS_EXPR>: Guard (-A)+B -> B-A transformation
X-Git-Url: http://git.etherboot.org/gcc/gcc.git/commitdiff_plain/aa36b46a1e05a0cf9afa86359a5817dd79183a35?ds=sidebyside

	* fold-const.c (fold) <PLUS_EXPR>: Guard (-A)+B -> B-A transformation
	with reorder_operands_p.


git-svn-id: svn://gcc.gnu.org/svn/gcc/trunk@80381 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 16547210234..2575996bca5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2004-04-03  Roger Sayle  <roger@eyesopen.com>
+
+	* fold-const.c (fold) <PLUS_EXPR>: Guard (-A)+B -> B-A transformation
+	with reorder_operands_p.
+
 2004-04-03  Jan Hubicka  <jh@suse.cz>
 
 	* md.texi (vec_set, vec_extract, vec_init): Document.
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 3fc6dd27d0b..e0d2adc09d6 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -5861,9 +5861,10 @@ fold (tree expr)
       if (TREE_CODE (arg1) == NEGATE_EXPR)
 	return fold (build (MINUS_EXPR, type, arg0, TREE_OPERAND (arg1, 0)));
       /* (-A) + B -> B - A */
-      if (TREE_CODE (arg0) == NEGATE_EXPR)
+      if (TREE_CODE (arg0) == NEGATE_EXPR
+	  && reorder_operands_p (TREE_OPERAND (arg0, 0), arg1))
 	return fold (build (MINUS_EXPR, type, arg1, TREE_OPERAND (arg0, 0)));
-      else if (! FLOAT_TYPE_P (type))
+      if (! FLOAT_TYPE_P (type))
 	{
 	  if (integer_zerop (arg1))
 	    return non_lvalue (fold_convert (type, arg0));