Your change breaks MIPS.

[Hans-Peter Nilsson]

On Sun, 30 Dec 2001, Jan Hubicka wrote:
> I got it now too.  I hoped the problem to be cc0 issue related to jump threading,
> but jump threading code appears to handle cc0 conservatively - in fact disable wast
> majority of threading - I need to fix that separately.

Mips *isn't* a cc0 target.  No, it really isn't: ignore the
define_expands.  If you don't believe me, look in genconfig.c
and insn-config.h for the definite judgement.

That said, there might still be a cc0 issue related to jump
threading, but it's not the mips issue.  Hope this helps.

brgds, H-P