https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56961
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> --- I suggest Index: gcc/cp/cp-gimplify.c =================================================================== --- gcc/cp/cp-gimplify.c (revision 211262) +++ gcc/cp/cp-gimplify.c (working copy) @@ -630,18 +630,8 @@ cp_gimplify_expr (tree *expr_p, gimple_s Also drop volatile variables on the RHS to avoid infinite recursion from gimplify_expr trying to load the value. */ if (!TREE_SIDE_EFFECTS (op1) - || (DECL_P (op1) && TREE_THIS_VOLATILE (op1))) + || TREE_THIS_VOLATILE (op1)) *expr_p = op0; - else if (TREE_CODE (op1) == MEM_REF - && TREE_THIS_VOLATILE (op1)) - { - /* Similarly for volatile MEM_REFs on the RHS. */ - if (!TREE_SIDE_EFFECTS (TREE_OPERAND (op1, 0))) - *expr_p = op0; - else - *expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p), - TREE_OPERAND (op1, 0), op0); - } else *expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p), op0, op1);