[Bug debug/52132] [4.7 Regression] ICE in loc_descriptor

[jakub at gcc dot gnu.org]

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.