* fold-const.c (operand_equal_p): Pay attention to side effects.

From-SVN: r29483

* fold-const.c (operand_equal_p): Pay attention to side effects.
From-SVN: r29483
05ca5990 · Gavin Romig-Koch · Gavin Romig-Koch · 3f94eee6 · 05ca5990 · 05ca5990
Commit 05ca5990 authored Sep 17, 1999 by Gavin Romig-Koch Committed by Gavin Romig-Koch Sep 17, 1999
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gcc/ChangeLog
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gcc/fold-const.c
+6 -0

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+Fri Sep 17 15:05:27 1999  Gavin Romig-Koch  <gavin@cygnus.com>
+
+	* fold-const.c (operand_equal_p): Pay attention to side effects.
+
 Fri Sep 17 11:14:17 1999  Jason Merrill  <jason@yorick.cygnus.com>

 	* libgcc2.c (L_exit): Check for ON_EXIT, not HAVE_ON_EXIT.

--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -2183,6 +2183,12 @@ operand_equal_p (arg0, arg1, only_const)
 				  TREE_OPERAND (arg1, 0), 0));

    case 'r':
+      /* If either of the pointer (or reference) expressions we are dereferencing
+	 contain a side effect, these cannot be equal. */
+      if (TREE_SIDE_EFFECTS (arg0)
+	  || TREE_SIDE_EFFECTS (arg1))
+	return 0;
+
      switch (TREE_CODE (arg0))
 	{
 	case INDIRECT_REF: