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

[Duncan Sands]

Hi Dmitry,
>> did you declare i1 to be an illegal type?
>
> No. How?

I think it will be considered illegal if you don't add it to any
register class.

Ciao, Duncan.

>
> 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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>>
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