[Bug target/115473] MIPS: -Os rtx_cost compare not correct

[roger at nextmovesoftware dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115473

Roger Sayle <roger at nextmovesoftware dot com> changed:

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--- Comment #1 from Roger Sayle <roger at nextmovesoftware dot com> ---
Created attachment 64592
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64592&action=edit
proposed patch

Interesting.  Here's a patch to perform this optimizaton in combine.  Hopefully
someone can test this on real hardware.