[llvm-dev] Issues with new Attributor (replaceAllUses fails with type mismatch)

[Mani, Suresh via llvm-dev]

[AMD Public Use]

Hi Johannes,

I took the latest llvm code now and the issue got resolved.

Thanks
M Suresh

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Mani, Suresh via llvm-dev
Sent: Monday, May 18, 2020 1:09 PM
To: Johannes Doerfert <johannesdoerfert at gmail.com>; llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] Issues with new Attributor (replaceAllUses fails with type mismatch)

[CAUTION: External Email]

[AMD Public Use]

Hi Johannes,

This fix (8d94d3c3b44c3a27a69b153cef9be4b8e481150e) does not seem the resolve the issue and the problem still persists.

Regards,
M Suresh

From: Johannes Doerfert <johannesdoerfert at gmail.com<mailto:johannesdoerfert at gmail.com>>
Sent: Saturday, May 16, 2020 4:42 AM
To: Mani, Suresh <Suresh.Mani at amd.com<mailto:Suresh.Mani at amd.com>>; llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Issues with new Attributor (replaceAllUses fails with type mismatch)

[CAUTION: External Email]

Hi Suresh,



thanks for reporting this!

I thought I fixed this with 8d94d3c3b44c3a27a69b153cef9be4b8e481150e.

Did you run before or after that commit?



Cheers,

  Johannes


On 5/15/20 7:17 AM, Mani, Suresh via llvm-dev wrote:

[AMD Public Use]



Hi ,



Please ignore the earlier header of Internal and Official use only.



Thanks

M Suresh



From: llvm-dev <llvm-dev-bounces at lists.llvm.org><mailto:llvm-dev-bounces at lists.llvm.org> On Behalf Of Mani, Suresh via llvm-dev

Sent: Friday, May 15, 2020 4:37 PM

To: llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>

Subject: [llvm-dev] Issues with new Attributor (replaceAllUses fails with type mismatch)



[CAUTION: External Email]



[AMD Official Use Only - Internal Distribution Only]



Hi ,



There seems to be some issue with attributor, exactly in  File Attributor.cpp,  Function Attributor::rewriteFunctionSignatures(),  Line No: 1600 (approrimate).



The llvm source code at above address is as follows:



    // Eliminate the instructions *after* we visited all of them.

    for (auto &CallSitePair : CallSitePairs) {

      CallBase &OldCB = *CallSitePair.first;

      CallBase &NewCB = *CallSitePair.second;

      ModifiedFns.insert(OldCB.getFunction());

      CGUpdater.replaceCallSite(OldCB, NewCB);

      OldCB.replaceAllUsesWith(&NewCB);   <---------------------------------------- Failing location

      OldCB.eraseFromParent();

    }



Failure symptom:

Assertion failed: New->getType() == getType() && "replaceAllUses of value with new value of different type!"



Snaps for IR from failing llvm IR and debug info while debugging is as follows:



Sample situation1:

Original code in IR --          %133 = call i32 (i32, ...) bitcast (void (i32)* @set_yydebug to i32 (i32, ...)*)(i32 1) #21

Attribute info ----                attributes #21 = { nounwind }



Debug info:

OldCB--------------------  %133 = call i32 (i32, ...) bitcast (void (i32)* @0 to i32 (i32, ...)*)(i32 1) #27

NewCB-------------------- call void @set_yydebug() #27





OldCB.replaceAllUsesWith(&NewCB);   fails because of a type mismatch b/w OldCB (i32) and NewCB (void)  .

------------------------------------------------------------------------------------------------------------------------------------------------------------------





Sample situation 2:



Original code in IR --     %63 = tail call %struct.cv* bitcast (%struct.cv.231* (i8, i64, i32*)* @Perl_find_runcv_where to %struct.cv* (i8, i64, i32*)*)(i8 zeroext 1, i64 %62, i32* null) #14

Attribute info ----   attributes #14 = { nounwind }



Debug info:

OldCB --- %63 = tail call %struct.cv.231* @Perl_find_runcv_where(i8 zeroext 1, i64 %62) #14

NewCB ---%64 = tail call %struct.cv* bitcast (%struct.cv.231* (i8, i64, i32*)* @15 to %struct.cv* (i8, i64, i32*)*)(i8 zeroext 1, i64 %62, i32* noalias align 536870912 null) #14



And hence OldCB.replaceAllUsesWith(&NewCB);   fails

------------------------------------------------------------------------------------------------------------------------------------------------------------------



The complete IR file is very huge, and had no luck in getting a reduced test case.



Thanks

M Suresh












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