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| author | Richard Stallman <rms@gnu.org> | 1992-10-08 08:30:25 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1992-10-08 08:30:25 +0000 |
| commit | 3f78332988a7f8beb96dee105a46828fbb7950fe (patch) | |
| tree | 694a20b3d6aafc8dba4c76769dc210d48777008a /gcc/fold-const.c | |
| parent | abd09f97059f60d60ee20fa4b212a073b97a9710 (diff) | |
| download | gcc-3f78332988a7f8beb96dee105a46828fbb7950fe.zip gcc-3f78332988a7f8beb96dee105a46828fbb7950fe.tar.gz gcc-3f78332988a7f8beb96dee105a46828fbb7950fe.tar.bz2 | |
(invert_truthvalue): Never alter ARG.
From-SVN: r2365
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index e5d735c..9cb107e 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -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) |