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| author | Andrew Pinski <andrew_pinski@playstation.sony.com> | 2007-05-28 19:43:10 +0000 |
|---|---|---|
| committer | Andrew Pinski <pinskia@gcc.gnu.org> | 2007-05-28 12:43:10 -0700 |
| commit | 3613c7abfa4392fd47d5078eb2261ad763772d2e (patch) | |
| tree | 115b6795f44871b452f47fbbb8f7221a4041f1d5 /gcc/fold-const.c | |
| parent | 3366c30b7fc1404833d54aaeb54de57ca7a16e16 (diff) | |
| download | gcc-3613c7abfa4392fd47d5078eb2261ad763772d2e.zip gcc-3613c7abfa4392fd47d5078eb2261ad763772d2e.tar.gz gcc-3613c7abfa4392fd47d5078eb2261ad763772d2e.tar.bz2 | |
re PR tree-optimization/32100 (vrp bitfield miscompilation)
2007-05-28 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR tree-opt/32100
* fold-const.c (tree_expr_nonnegative_warnv_p): Don't
return true when truth_value_p is true and the type
is of signed:1.
2007-05-28 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR tree-opt/32100
* gcc.c-torture/execute/vrp-7.c: New test.
From-SVN: r125139
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 16dfd3b..01ce961 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -13485,9 +13485,14 @@ tree_expr_nonnegative_warnv_p (tree t, bool *strict_overflow_p) /* ... fall through ... */ default: - if (truth_value_p (TREE_CODE (t))) - /* Truth values evaluate to 0 or 1, which is nonnegative. */ - return true; + { + tree type = TREE_TYPE (t); + if ((TYPE_PRECISION (type) != 1 || TYPE_UNSIGNED (type)) + && truth_value_p (TREE_CODE (t))) + /* Truth values evaluate to 0 or 1, which is nonnegative unless we + have a signed:1 type (where the value is -1 and 0). */ + return true; + } } /* We don't know sign of `t', so be conservative and return false. */ |