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| author | Richard Biener <rguenther@suse.de> | 2017-11-24 09:40:40 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2017-11-24 09:40:40 +0000 |
| commit | 6a248fce5694ba4304f692a5ebeff0bb965e40a2 (patch) | |
| tree | df42271519e4d9837d766d5e0ce881abc165e6f8 /gcc/tree-ssa-sccvn.c | |
| parent | 97e1c8786bdb4e54520d9135f8ec378237872dbb (diff) | |
| download | gcc-6a248fce5694ba4304f692a5ebeff0bb965e40a2.zip gcc-6a248fce5694ba4304f692a5ebeff0bb965e40a2.tar.gz gcc-6a248fce5694ba4304f692a5ebeff0bb965e40a2.tar.bz2 | |
re PR tree-optimization/83128 (Unable to optimize {m,c}alloc when strings builtin are used)
2017-11-24 Richard Biener <rguenther@suse.de>
PR tree-optimization/83128
* tree-ssa-sccvn.c (fully_constant_vn_reference_p): Handle STRING_CSTs.
(vn_reference_lookup_3): Likewise.
* gcc.dg/tree-ssa/ssa-fre-62.c: New testcase.
From-SVN: r255136
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index d0ff301..63a3db9 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -1388,10 +1388,14 @@ fully_constant_vn_reference_p (vn_reference_t ref) else if (base->opcode == MEM_REF && base[1].opcode == ADDR_EXPR && (TREE_CODE (TREE_OPERAND (base[1].op0, 0)) == VAR_DECL - || TREE_CODE (TREE_OPERAND (base[1].op0, 0)) == CONST_DECL)) + || TREE_CODE (TREE_OPERAND (base[1].op0, 0)) == CONST_DECL + || TREE_CODE (TREE_OPERAND (base[1].op0, 0)) == STRING_CST)) { decl = TREE_OPERAND (base[1].op0, 0); - ctor = ctor_for_folding (decl); + if (TREE_CODE (decl) == STRING_CST) + ctor = decl; + else + ctor = ctor_for_folding (decl); } if (ctor == NULL_TREE) return build_zero_cst (ref->type); @@ -2331,7 +2335,8 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void *vr_, rhs = TREE_OPERAND (tem, 0); rhs_offset += tree_to_uhwi (TREE_OPERAND (tem, 1)); } - else if (DECL_P (tem)) + else if (DECL_P (tem) + || TREE_CODE (tem) == STRING_CST) rhs = build_fold_addr_expr (tem); else return (void *)-1; |