diff options
| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-08-03 13:33:28 +0000 |
|---|---|---|
| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-08-03 13:33:28 +0000 |
| commit | 105f72b0a8bd8fe5cbc440cbc413411fecf5b3f3 (patch) | |
| tree | 8d726f330bfaa34d014e6f7a8736038a869c9858 /gcc/fold-const.c | |
| parent | a52a801dbb21f7fd58673c52ab1398fcec1bb3bc (diff) | |
| download | gcc-105f72b0a8bd8fe5cbc440cbc413411fecf5b3f3.tar.gz | |
2011-08-03 Richard Guenther <rguenther@suse.de>
PR middle-end/49958
* fold-const.c (fold_binary_loc): Only associate
(+ (+ (* a b) c) (* d e)) as (+ (+ (* a b) (* d e)) c) if
overflow wraps.
* gcc.dg/torture/pr49958.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177270 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 8ad806f9eee..0cdf682ae38 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -9711,12 +9711,13 @@ fold_binary_loc (location_t loc, /* Reassociate (plus (plus (mult) (foo)) (mult)) as (plus (plus (mult) (mult)) (foo)) so that we can take advantage of the factoring cases below. */ - if (((TREE_CODE (arg0) == PLUS_EXPR - || TREE_CODE (arg0) == MINUS_EXPR) - && TREE_CODE (arg1) == MULT_EXPR) - || ((TREE_CODE (arg1) == PLUS_EXPR - || TREE_CODE (arg1) == MINUS_EXPR) - && TREE_CODE (arg0) == MULT_EXPR)) + if (TYPE_OVERFLOW_WRAPS (type) + && (((TREE_CODE (arg0) == PLUS_EXPR + || TREE_CODE (arg0) == MINUS_EXPR) + && TREE_CODE (arg1) == MULT_EXPR) + || ((TREE_CODE (arg1) == PLUS_EXPR + || TREE_CODE (arg1) == MINUS_EXPR) + && TREE_CODE (arg0) == MULT_EXPR))) { tree parg0, parg1, parg, marg; enum tree_code pcode; |