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(invert_truthvalue): Never alter ARG.

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From-SVN: r2365
This commit is contained in:
Richard Stallman 1992-10-08 08:30:25 +00:00
parent abd09f9705
commit 3f78332988
1 changed files with 4 additions and 6 deletions
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10
gcc/fold-const.c
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@ -1979,8 +1979,8 @@ omit_one_operand (type, result, omitted)
return t;
}
/* Return a simplified tree node for the truth-negation of ARG
(perhaps by altering ARG). It is known that ARG is an operation that
/* Return a simplified tree node for the truth-negation of ARG. This
never alters ARG itself. We assume that ARG is an operation that
returns a truth value (0 or 1). */
tree
@ -2000,10 +2000,8 @@ invert_truthvalue (arg)
&& code != NE_EXPR && code != EQ_EXPR)
return build1 (TRUTH_NOT_EXPR, type, arg);
else
{
TREE_SET_CODE (arg, invert_tree_comparison (code));
return arg;
}
return build (invert_tree_comparison (code),
TREE_OPERAND (arg, 0), TREE_OPERAND (arg, 1));
}
switch (code)