[LLVMdev] [NVPTX] Backend failure in LegalizeDAG due to unimplemented expand in target lowering

[Dmitry N. Mikushin]

Hi Duncan,

> did you declare i1 to be an illegal type?

No. How?

2012/6/30 Duncan Sands <baldrick at free.fr>:
> Hi Dmitry,
>> So instead of setOperationAction(ISD::STORE, MVT::i1, Expand); one
>> should probably do setOperationAction(ISD::STORE, MVT::i1, Custom);
>> and implement it in NVPTXTargetLowering::LowerOperation.
>>
>> But this issue makes a good point about the code efficiency: I suspect
>> such expansion will be very ugly in terms of performance. Probably we
>> can do much better if bool would use i32 instead of i1. I don't know
>> how to do that, though. Is it possible?
>
> did you declare i1 to be an illegal type?  If so, you shouldn't get any
> stores of i1 at this stage (you may get trunc stores to i1, but that is
> different).
>
> Ciao, Duncan.
>
>>
>> Anyway, if this is a defect, then it's a blocker for us, and we'd much
>> appreciate a fix.
>>
>> - D.
>>
>> 2012/6/29 Eli Friedman <eli.friedman at gmail.com>:
>>> On Fri, Jun 29, 2012 at 2:11 PM, Dmitry N. Mikushin <maemarcus at gmail.com> wrote:
>>>> Hi again,
>>>>
>>>> Kind people on #llvm helped me to utilize bugpoint to reduce the
>>>> previously submitted test case. For record, it code be done with the
>>>> following command:
>>>>
>>>> $ bugpoint -llc-safe test.ll
>>>>
>>>> The resulting IR is attached, and it is crashing in the same way. Is
>>>> it a valid code?
>>>
>>> Looks like a bug in the NVPTXISelLowering.cpp: it has
>>> "setOperationAction(ISD::STORE, MVT::i1, Expand);", but the legalizer
>>> doesn't know how to handle that.
>>>
>>> -Eli
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