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| author | Richard Guenther <rguenther@suse.de> | 2008-12-02 14:49:00 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-12-02 14:49:00 +0000 |
| commit | bd170bbcd819a899eace0db56b353702b8d1ae2f (patch) | |
| tree | c84c5aad5a5a4c998cee77f68adb2a8d68830ab1 /gcc/fold-const.c | |
| parent | d47a01516c91f35d0f60d2e636d6e3724ee400b3 (diff) | |
| download | gcc-bd170bbcd819a899eace0db56b353702b8d1ae2f.zip gcc-bd170bbcd819a899eace0db56b353702b8d1ae2f.tar.gz gcc-bd170bbcd819a899eace0db56b353702b8d1ae2f.tar.bz2 | |
re PR tree-optimization/38359 (ICE in set_lattice_value, at tree-ssa-ccp.c:466)
2008-12-02 Richard Guenther <rguenther@suse.de>
PR tree-optimization/38359
* fold-const.c (fold_binary): Fold -1 >> x to -1 only for
non-negative x.
* gcc.c-torture/compile/pr38359.c: New testcase.
* gcc.c-torture/execute/shiftopt-1.c: Adjust.
From-SVN: r142356
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 8dddca1..93415d8 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -11457,7 +11457,8 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) case RSHIFT_EXPR: /* Optimize -1 >> x for arithmetic right shifts. */ - if (integer_all_onesp (arg0) && !TYPE_UNSIGNED (type)) + if (integer_all_onesp (arg0) && !TYPE_UNSIGNED (type) + && tree_expr_nonnegative_p (arg1)) return omit_one_operand (type, arg0, arg1); /* ... fall through ... */ |