[Bug middle-end/54154] cprop_hardreg generates redundant instructions

[Paulo.Matos at csr dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54154

--- Comment #6 from Paulo J. Matos <Paulo.Matos at csr dot com> 2012-08-02 09:58:55 UTC ---
Created attachment 27926
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27926
regcprop patch to remove redundant moves

This patch seems to fix 54154.
I am not sure its generic enough to make it straight into GCC but it works with
our port and I ran all the tests I have access to without any regressions.

With send it to gcc-patches.