[PATCH] [IndVarSimplify] Widen signed loop compare instructions to enable additional optimizations.

[Chad Rosier]

Andy,
Would you mind taking a look at PR21030?
http://llvm.org/bugs/show_bug.cgi?id=21030

I've left details in the bug as to what I think is going on, but your
input is welcome.  I believe my commit exposed an issue where we're
zero-extending an expression, when in fact it should be sign-extended,
AFAICT.

 Chad

> Thanks, Sanjay.  I'll investigate now.
>
>> Hi Chad -
>> I think this patch caused or exposed some other bug here:
>> http://llvm.org/bugs/show_bug.cgi?id=21030
>>
>> http://reviews.llvm.org/D5333
>>
>>
>>
>
> http://reviews.llvm.org/D5333
>
>
>
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