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| author | Richard Guenther <rguenther@suse.de> | 2008-06-25 08:41:14 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-06-25 08:41:14 +0000 |
| commit | ee1f1270454962e90a8f76765ca77fd23134657a (patch) | |
| tree | aa6ec98a15b381a6e6704ef0dc90dbeea8696b35 /gcc/fold-const.c | |
| parent | 423addc532f23bf1a9fe9900d0d13e0197d96496 (diff) | |
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re PR tree-optimization/35518 (FAIL: gcc.c-torture/execute/20040709-1.c execution at -O2 and above)
2008-06-25 Richard Guenther <rguenther@suse.de>
PR tree-optimization/35518
* fold-const.c (fold_ternary): Strip trivial BIT_FIELD_REFs.
* tree-sra.c (instantiate_element): Use fold_build3 to build
BIT_FIELD_REFs.
(try_instantiate_multiple_fields): Likewise.
From-SVN: r137100
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index aaae9d6..fc72b9b 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -13117,6 +13117,13 @@ fold_ternary (enum tree_code code, tree type, tree op0, tree op1, tree op2) return fold_convert (type, integer_zero_node); } } + + /* A bit-field-ref that referenced the full argument can be stripped. */ + if (INTEGRAL_TYPE_P (TREE_TYPE (arg0)) + && TYPE_PRECISION (TREE_TYPE (arg0)) == tree_low_cst (arg1, 1) + && integer_zerop (op2)) + return fold_convert (type, arg0); + return NULL_TREE; default: |