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(fold, truth_andor): Disable optimization for side effects on RHS.

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From-SVN: r14047
This commit is contained in:
Richard Kenner 1997-05-08 13:20:18 -04:00
parent 95e8f2f306
commit 96f06cb6dd
1 changed files with 4 additions and 2 deletions
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6
gcc/fold-const.c
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@ -4791,12 +4791,14 @@ fold (expr)
to A || (B && C). Note that either operator can be any of the four
truth and/or operations and the transformation will still be
valid. Also note that we only care about order for the
ANDIF and ORIF operators. */
ANDIF and ORIF operators. If B contains side effects, this
might change the truth-value of A. */
if (TREE_CODE (arg0) == TREE_CODE (arg1)
&& (TREE_CODE (arg0) == TRUTH_ANDIF_EXPR
|| TREE_CODE (arg0) == TRUTH_ORIF_EXPR
|| TREE_CODE (arg0) == TRUTH_AND_EXPR
|| TREE_CODE (arg0) == TRUTH_OR_EXPR))
|| TREE_CODE (arg0) == TRUTH_OR_EXPR)
&& ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg0, 1)))
{
tree a00 = TREE_OPERAND (arg0, 0);
tree a01 = TREE_OPERAND (arg0, 1);