https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56961
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> --- (In reply to Richard Biener from comment #7) > 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); This might of course drop arbitrary side-effects of op1 such as a volatile load from a.b[foo()] where foo () would be dropped. So it isn't really correct.