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| author | Richard Biener <rguenther@suse.de> | 2016-06-08 13:11:43 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2016-06-08 13:11:43 +0000 |
| commit | 72d50660ad57224cefc7ad40b81c994b49a503b6 (patch) | |
| tree | 91404c94ca65e268950f891ecf25f02f3c2cbd3b /gcc/tree-ssa.c | |
| parent | 988c115ca0fee432e5d6823a44e3289c0b73ad15 (diff) | |
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re PR tree-optimization/71452 (Wrong optimization of stores to _Bool via char*)
2016-06-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/71452
* tree-ssa.c (non_rewritable_lvalue_p): Make sure that the
type used for the SSA rewrite has enough precision to cover
the dynamic type of the location.
* gcc.dg/torture/pr71452.c: New testcase.
From-SVN: r237214
Diffstat (limited to 'gcc/tree-ssa.c')
| -rw-r--r-- | gcc/tree-ssa.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/tree-ssa.c b/gcc/tree-ssa.c index 2f3caf3..30c6269 100644 --- a/gcc/tree-ssa.c +++ b/gcc/tree-ssa.c @@ -1292,6 +1292,14 @@ non_rewritable_lvalue_p (tree lhs) if (integer_zerop (TREE_OPERAND (lhs, 1)) && DECL_P (decl) && DECL_SIZE (decl) == TYPE_SIZE (TREE_TYPE (lhs)) + /* If the dynamic type of the decl has larger precision than + the decl itself we can't use the decls type for SSA rewriting. */ + && ((! INTEGRAL_TYPE_P (TREE_TYPE (decl)) + || compare_tree_int (DECL_SIZE (decl), + TYPE_PRECISION (TREE_TYPE (decl))) == 0) + || (INTEGRAL_TYPE_P (TREE_TYPE (lhs)) + && (TYPE_PRECISION (TREE_TYPE (decl)) + >= TYPE_PRECISION (TREE_TYPE (lhs))))) && (TREE_THIS_VOLATILE (decl) == TREE_THIS_VOLATILE (lhs))) return false; |