https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79536
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #4)
> So perhaps this:
> --- a/gcc/fold-const.c
> +++ b/gcc/fold-const.c
> @@ -581,8 +581,8 @@ fold_negate_expr (location_t loc, tree t)
> case COMPLEX_EXPR:
> if (negate_expr_p (t))
> return fold_build2_loc (loc, COMPLEX_EXPR, type,
> - fold_negate_expr (loc, TREE_OPERAND (t, 0)),
> - fold_negate_expr (loc, TREE_OPERAND (t, 1)));
> + negate_expr (TREE_OPERAND (t, 0)),
> + negate_expr (TREE_OPERAND (t, 1)));
> break;
>
> case CONJ_EXPR:
>
>
> (and I guess handle CONJ_EXPR the same)
Why? negate_expr_p checks
case COMPLEX_EXPR:
return negate_expr_p (TREE_OPERAND (t, 0))
&& negate_expr_p (TREE_OPERAND (t, 1));
so it is negatable.
