Regression with r200947: [CodeGenPrepare] Move away sign extensions that get in the way of addressing mode.

[Quentin Colombet]

Sure, I’m looking into it.

-Quentin

On Feb 12, 2014, at 12:03 PM, Tom Stellard <tom at stellard.net> wrote:

> Hi Quentin,
> 
> I've discovered a regression with this commit, please see the attached test case.
> In this case, CodeGenPrepare is promoting the mul in a sext + mul pattern even
> though the addressing mode it is creating isn't legal.
> 
> One interesting thing about this test case is that if you remove the
> nsw from the mul instruction, then the incorrect transform does not
> take place.  I'm not sure why this matters.  Would you mind taking a look?
> 
> Thanks,
> Tom
> <codegen-prepare-addrmode-sext.ll>

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