[PATCH] InstCombine: Narrow switch instruction operands using known bits

[Akira Hatanaka]

Thanks Pete. Committed r219832.

On Wed, Oct 15, 2014 at 11:35 AM, Pete <peter_cooper at apple.com> wrote:

> I think it makes sense to truncate down to the largest legal type as
> you've done here.  Anything lower than that gets tricky to reason about the
> quality of code in the backends.
>
> LGTM.
>
> http://reviews.llvm.org/D5691
>
>
>
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