http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52178
--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-02-13 13:54:31 UTC --- > Should PLACEHOLDER_EXPRs even survive gimplification? I see tree.c says > if they survive until expand we'll ICE - but that comment is probably from > before gimple/SSA times. Yes, PLACEHOLDER_EXPRs are effectively useless once gimplification is done. But they need to be somehow preserved, see free_lang_data_in_one_sizepos in tree.c.
