http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52132
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-06 10:23:31 UTC --- Created attachment 26581 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26581 gcc47-pr52132.patch Untested fix. What get_true_reg does might be reasonable for code where we have quite strict requirements on what SUBREG can be applied or not, but it is definitely wrong for arbitrary SUBREGs in DEBUG_INSNs. In fact, I don't see what get_true_reg would buy us, we get at the real REG in for_each_rtx anyway and can keep the SUBREGs, FLOAT_EXTEND etc. in the DEBUG_INSN.
