[llvm-dev] creating Intrinsic DAG Node

[Ryan Taylor via llvm-dev]

When using DAG.getNode with INTRINSIC_WO_CHAIN, what should the first
SDValue be? How do I get the chain here?

Thanks.

On Fri, Jun 24, 2016 at 4:50 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:

> I've tried all the types (both for result and Intrinsic ID), can't seem to
> find what cast is causing the issue here.
>
> On Fri, Jun 24, 2016 at 11:47 AM, Ryan Taylor <ryta1203 at gmail.com> wrote:
>
>> 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
>>>>>
>>>>>
>>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
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>>>
>>>
>>>
>>
>
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