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| author | Richard Biener <rguenther@suse.de> | 2015-07-14 11:39:14 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2015-07-14 11:39:14 +0000 |
| commit | fe9acb3a7a7c448560abc9ab17558798ee1e5cad (patch) | |
| tree | 58e09f0ce7f9d02b69bacb110bbc45d67acdc4cd /gcc/tree-vrp.c | |
| parent | 1ec1fa94b7f20c6f8ebaba6f37d8aa1357420d72 (diff) | |
| download | gcc-fe9acb3a7a7c448560abc9ab17558798ee1e5cad.zip gcc-fe9acb3a7a7c448560abc9ab17558798ee1e5cad.tar.gz gcc-fe9acb3a7a7c448560abc9ab17558798ee1e5cad.tar.bz2 | |
re PR tree-optimization/66863 (wrong code at -Os and above on x86_64-linux-gnu)
2015-07-14 Richard Biener <rguenther@suse.de>
PR tree-optimization/66863
* tree-vrp.c (register_edge_assert_for_2): Properly restrict
what we record for conversion use stmt lhs inequalities.
* gcc.dg/torture/pr66863.c: New testcase.
From-SVN: r225768
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 8b2235c..795b027 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -5381,7 +5381,17 @@ register_edge_assert_for_2 (tree name, edge e, gimple_stmt_iterator bsi, cst = int_const_binop (code, val, cst); } else if (CONVERT_EXPR_CODE_P (code)) - cst = fold_convert (TREE_TYPE (name2), val); + { + /* For truncating conversions require that the constant + fits in the truncated type if we are going to record + an inequality. */ + if (comp_code == NE_EXPR + && (TYPE_PRECISION (TREE_TYPE (name2)) + < TYPE_PRECISION (TREE_TYPE (name))) + && ! int_fits_type_p (val, TREE_TYPE (name2))) + continue; + cst = fold_convert (TREE_TYPE (name2), val); + } else continue; |