[llvm-bugs] [Bug 27356] [ppc] missed chance to use rlwnm

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27356

Hal Finkel <hfinkel at anl.gov> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Hal Finkel <hfinkel at anl.gov> ---
(In reply to comment #1)
> (In reply to comment #0)
> > Double-check to make sure because my PPC is beyond rusty, but I think this
> > is:
> > 
> >         subfic r4, r4, 32
> >         rlwnm r3, r3, r4, 31, 31
> 
> Yes. I've used cvc4 to verify that this is true (assuming that y < 32 --
> three cheers for undefined behavior!).
> 
> Also, for y < 64, we also can use rldcl(x, subfic(y, 64), 63).

Patterns added in r280454. Thanks!

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