[llvm-dev] How to interpret Selection DAG error output

[Rail Shafigulin via llvm-dev]

On Thu, Feb 18, 2016 at 10:50 AM, Krzysztof Parzyszek via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On 2/18/2016 12:43 PM, Rail Shafigulin via llvm-dev wrote:
>
>>
>> LLVM ERROR: Cannot select: 0x3284268: glue = EsenciaISD::SET_FLAG
>> 0x3283608, 0x3283710, 0x3283e48 [ORD=3] [ID=11]
>>    0x3283608: i32,ch = CopyFromReg 0x3257980, 0x3283500 [ORD=1] [ID=9]
>>      0x3283500: i32 = Register %vreg5 [ID=1]
>>    0x3283710: i32 = Constant<3> [ID=2]
>>    0x3283e48: i32 = Constant<20> [ID=8]
>> In function: fib
>>
>> As far as I can understand LLVM cannot select it because the pattern is
>> not specified. Unfortunately for me, I can't understand how to interpret
>> this output. Would anybody be able to help me out?
>>
>
>
> The DAG node that has failed selection is "SET_FLAG %vreg5, 3, 20", the
> type of the node is "glue" and all 3 arguments are i32.
>

I understand where SET_FLAG, 3 and 20 come from, but how did you arrive the
conclusion that %vreg5 should be part of the pattern?


> The top line shows the node that caused the failure.  The hex numbers on
> that line are the addresses of the arguments.  These arguments are then
> listed below.
>
> Newer versions of LLVM show node ids instead of addresses, but AFAIK it
> was dependent on some configuration option.
>
> -Krzysztof
>
>
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-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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