[LLVMdev] how to define INTRINSIC_W_CHAIN

[Zhang, Kewu]

I mean, 
"
SelectionDAGBuilder::visitTargetIntrinsic()"

called 
" bool HasChain = !I.doesNotAccessMemory();"
first.


So I think I must  did not set up the "access memory  kind flag" earlier.
 But what can I do to set it up?
thought should be in Intrinsic definition, instruction definition..... but failed to make it right.

X86 has it... did not quite understand ...

any simple example out there ?


many many tks!

Kevin


________________________________________
From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] on behalf of Zhang, Kewu
Sent: Friday, July 18, 2014 5:07 PM
To: Tom Stellard
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] how to define INTRINSIC_W_CHAIN

Tks Tom,

That is my confusing part.  How can I make it to "access memory” so it will  HasChain?

Is there any flag set like in typeProfile, Node, instructions?   myLoad, mayStore, SDNPHasChain?


-kevin
On Jul 18, 2014, at 4:26 PM, Tom Stellard <tom at stellard.net> wrote:

> On Fri, Jul 18, 2014 at 04:15:45PM -0400, kewuzhang wrote:
>> sure!
>>
>> class TEST_INTINSIC_FM< string asmstr> : Intrinsic
>>       <llvm_i32_ty], [llvm_i32_ty, llvm_ptr_ty],
>>      [IntrReadWriteArgMem],
>>      !strconcat(“llvm.test”, asmstr),”.float”)
>>      >;
>
> Have a look at the SelectionDAGBuilder::visitTargetIntrinsic()
> function in lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp.  That is
> where intrinsics are lowered to SelectionDAG nodes, so you can start
> your debugging there to try to figure out why it is INSTRINSIC_WO_CHAIN.
>
> -Tom
>
>>
>> tks
>> On Jul 18, 2014, at 4:06 PM, Tom Stellard <tom at stellard.net> wrote:
>>
>>> On Fri, Jul 18, 2014 at 03:19:47PM -0400, kewuzhang wrote:
>>>> en!
>>>>
>>>> my test is : %r1 = call<float> @test.adddiv( <float> %r0, <float>* %p0).
>>>> since
>>>>
>>>
>>> Can you show us the code from your .td file where you define the intrinsic?
>>>
>>> -Tom
>>>
>>>>>> but somehow it always fall into INTRINSIC_WO_CHAIN category.
>>>> (caught it in lowering..)
>>>>
>>>> I think it doesn’t have chain in initial DAG.
>>>>
>>>> unfortunately the intrinsic “test.adddiv” is defined by me for now.  not sure how to make it has a chain.
>>>>
>>>> kevin
>>>>
>>>>
>>>> On Jul 18, 2014, at 3:06 PM, Krzysztof Parzyszek <kparzysz at codeaurora.org> wrote:
>>>>
>>>>> On 7/18/2014 2:00 PM, kewuzhang wrote:
>>>>>>
>>>>>> I am working on an intrinsic function, which will write to a pointer argument.
>>>>>> So I am lowering it and think I need to catch it in lowerINTRINSIC_W_CHAIN,  but somehow it always fall into INTRINSIC_WO_CHAIN category.
>>>>>>
>>>>>> I put [IntrReadwriteArgMem] into my Intrinsic  class definition, it did not help.
>>>>>> tried put [SDNPHasChain] into  intrinsic class definition, cause errors” Element type mismatch for list”.
>>>>>>
>>>>>> wondering how to flag it  to INTRINSIC_W_CHAIN?
>>>>>
>>>>>
>>>>> Does it have chain in the initial DAG?
>>>>>
>>>>> -Krzysztof
>>>>>
>>>>>
>>>>> --
>>>>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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>>>>> LLVM Developers mailing list
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>>>>
>>>>
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>>


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