[llvm-dev] creating Intrinsic DAG Node

[Ryan Taylor via llvm-dev]

That's what I thought but I got the same error with:

DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
DAG.getTargetConstant(Intrinsic::my_intrinsic, DL, MVT::i16), LHS);

Thanks.

What should this call look like?


On Fri, Jun 24, 2016 at 10:53 AM, <escha at apple.com> wrote:

> The intrinsic ID is an int, not a float.
>
> —escha
>
> On Jun 24, 2016, at 7:49 AM, Ryan Taylor via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> given the following C code:
>
> float b=16, a=0;
> int main() {
>    float a = sqrt(b);
>    return0;
> }
>
> I'm trying to lower FSQRT down, but getting a casting issue, my code is:
>
> SDValue XXXLowering::LowerFSQRT(SDValue Op, SelectionDAG &DAG) const {
>    SDLoc DL(Op);
>    EVT VT = Op.getValueType();
>    SDValue LHS = Op.getOperand(0);
>
>    SDValue newNode = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
> DAG.getTargetConstantFP(Intrinsic::my_intrinsic, DL, VT), LHS);
>    return newNode;
> }
>
> The error I'm getting is: Assertion 'isa<X>(Val) && "cast<Ty>() argument
> of incompatible type!"
>
> Is this the correct way to add intrinsic dag node?
>
> Thanks.
>
>
> On Tue, Feb 2, 2016 at 5:10 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:
>
>> Matt,
>>
>>   The added intrinsic in DAG looks like:
>>
>> 0xbedb698: i32 = llvm.MyIntrinsic 0xbedb200, 0xbedac18 [ORD=4]
>>
>>   The builtin in DAG looks like:
>>
>> 0xbedb2a8: i32,ch = llvm 0xbedb158:1, 0xbedb200, 0xbedb158 [ORD=7] [ID=16]
>>
>>    The only difference I'm seeing is the extra operand, which is a 'ch'
>> from a load.
>>
>> On Tue, Feb 2, 2016 at 3:55 PM, Matt Arsenault <arsenm2 at gmail.com> wrote:
>>
>>>
>>> > On Feb 2, 2016, at 12:43, Ryan Taylor <ryta1203 at gmail.com> wrote:
>>> >
>>> > Matt,
>>> >
>>> >   This seems to generate llvm.my_intrinsic just fine in the DAG, so no
>>> DAG errors; however, it won't match. For example, if I call the intrinsic
>>> from C, the DAG node looks to be named the same in dotty file but it won't
>>> match... am I missing something?
>>> >
>>> >   I've done it exactly the way it was done above. The DAG looks great
>>> but it won't match. Did I miss something?
>>> >
>>> > Thanks.
>>> >
>>>
>>> Are you using the right intrinsic type? Does it have a chain or result?
>>>
>>> How are you calling it from C? Are you declaring the intrinsic? This can
>>> fail if you mismatched the readnone or readonly to the actual intrinsic
>>> definition
>>>
>>>
>>
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