https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83128
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2017-11-23 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. Index: gcc/tree-ssa-sccvn.c =================================================================== --- gcc/tree-ssa-sccvn.c (revision 255093) +++ gcc/tree-ssa-sccvn.c (working copy) @@ -1388,10 +1388,14 @@ fully_constant_vn_reference_p (vn_refere 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 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;