* combine.c (make_compound_operation): Swap operands of

	commutative operation if necessary before returning.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@107219 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 10 insertions, 0 deletions

diff --git a/gcc/combine.c b/gcc/combine.c
index 9f910a7b336..b43b9b621c6 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6914,6 +6914,16 @@ make_compound_operation (rtx x, enum rtx_code in_code)
 	SUBST (XEXP (x, i), new);
       }
 
+  /* If this is a commutative operation, the changes to the operands
+     may have made it noncanonical.  */
+  if (COMMUTATIVE_ARITH_P (x)
+      && swap_commutative_operands_p (XEXP (x, 0), XEXP (x, 1)))
+    {
+      tem = XEXP (x, 0);
+      SUBST (XEXP (x, 0), XEXP (x, 1));
+      SUBST (XEXP (x, 1), tem);
+    }
+
   return x;
 }