[Bug debug/50869] [4.7 Regression] ice in vt_expand_var_loc_chain

[aoliva at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50869

--- Comment #3 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2011-10-27 20:46:12 UTC ---
Created attachment 25638
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25638
Patch that fixes the bug, testing

Here's a patch that fixes the bug.  We don't want cselib to expand argp, and
when it tries to we get all confused with a zero-depth expansion (the REG
itself) but with VALUEs associated with it, that cselib pointlessly tried to
expand, pushed onto the dependency stack.