>
> This fixes Honzas previous commit to not build &integer_zero_node (what?).
Oops, thanks!
Honza
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
>
> Richard.
>
> 2014-08-19 Richard Biener <rguent...@suse.de>
>
> * gimple-fold.c (fold_gimple_assign): Properly build a
> null-pointer constant when devirtualizing addresses.
>
> Index: gcc/gimple-fold.c
> ===================================================================
> --- gcc/gimple-fold.c (revision 214135)
> +++ gcc/gimple-fold.c (working copy)
> @@ -319,14 +319,6 @@ fold_gimple_assign (gimple_stmt_iterator
> = possible_polymorphic_call_targets (rhs, stmt, &final);
> if (final && targets.length () <= 1 && dbg_cnt (devirt))
> {
> - tree fndecl;
> -
> - if (targets.length () == 1)
> - fndecl = targets[0]->decl;
> - else
> - /* We can not use __builtin_unreachable here because it
> - can not have address taken. */
> - fndecl = integer_zero_node;
> if (dump_enabled_p ())
> {
> location_t loc = gimple_location_safe (stmt);
> @@ -335,11 +327,19 @@ fold_gimple_assign (gimple_stmt_iterator
> "reference to function %s\n",
> targets.length () == 1
> ? targets[0]->name ()
> - : "__builtin_unreachable");
> + : "NULL");
> + }
> + if (targets.length () == 1)
> + {
> + val = fold_convert (TREE_TYPE (val),
> + build_fold_addr_expr_loc
> + (loc, targets[0]->decl));
> + STRIP_USELESS_TYPE_CONVERSION (val);
> }
> - val = fold_convert (TREE_TYPE (val),
> - build_fold_addr_expr_loc (loc, fndecl));
> - STRIP_USELESS_TYPE_CONVERSION (val);
> + else
> + /* We can not use __builtin_unreachable here because it
> + can not have address taken. */
> + val = build_int_cst (TREE_TYPE (val), 0);
> return val;
> }
> }
