[PATCH] D17781: Codegen: [PPC] Word Rotates are Zero Extending

[Eric Christopher via llvm-commits]

You're right. We came up with the usual case, but not the normal case. Kyle
is going to add a check for the arguments as well :)

-eric

On Tue, Mar 1, 2016 at 2:30 PM Hal Finkel <hfinkel at anl.gov> wrote:

> hfinkel added a subscriber: hfinkel.
> hfinkel requested changes to this revision.
> hfinkel added a reviewer: hfinkel.
> hfinkel added a comment.
> This revision now requires changes to proceed.
>
> I don't think this is right. RLWINM starts by taking two copies of the
> 32-bit amount, one copy in the lower word and one copy in the upper word
> and rotates the result, Then it composes the mask. The mask is non-zero in
> the upper bits if MB >= ME.
>
>
> Repository:
>   rL LLVM
>
> http://reviews.llvm.org/D17781
>
>
>
>
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