llvm dev - Apr 2020 - Running opt O1 outside of llvm

Hi,
I would like to run the -O1 pass sequence followed by -reg2mem from an out
of tree project which uses llvm.
I am using the following code snippet to do so but in some cases, my method
is also vectorising the code, which doesn't happen when running the same
sequence(-S -O1 -reg2mem) through opt. Can someone please help me find what
I am missing?

Thanks,
Akash.




















* PassManagerBuilder PM; PM.OptLevel = 1; PM.SizeLevel = 0;
legacy::FunctionPassManager FPM(&llvm_module); legacy::PassManager MPM;
PM.Inliner = createAlwaysInlinerLegacyPass(); PM.DisableUnrollLoops = true;
PM.populateFunctionPassManager(FPM); PM.populateModulePassManager(MPM);
FPM.doInitialization(); for (auto &F : llvm_module)    FPM.run(F);
FPM.doFinalization(); MPM.run(llvm_module); legacy::FunctionPassManager
FPM(&llvm_module); FPM.add(createDemoteRegisterToMemoryPass());
FPM.doInitialization(); for (auto &F : llvm_module)    FPM.run(F);
FPM.doFinalization();*
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It would be helpful to know in which cases your custom pipeline
vectorizes when it should not.
Note this might be dependent on target-specifics, such as
PMB.LibraryInfo tjat your code below is not using.

Michael


Am Sa., 4. Apr. 2020 um 12:36 Uhr schrieb Akash Banerjee via llvm-dev
<llvm-dev at lists.llvm.org>:
>
> Hi,
> I would like to run the -O1 pass sequence followed by -reg2mem from an out
of tree project which uses llvm.
> I am using the following code snippet to do so but in some cases, my method
is also vectorising the code, which doesn't happen when running the same
sequence(-S -O1 -reg2mem) through opt. Can someone please help me find what I am
missing?
>
> Thanks,
> Akash.
>
> PassManagerBuilder PM;
> PM.OptLevel = 1;
> PM.SizeLevel = 0;
> legacy::FunctionPassManager FPM(&llvm_module);
> legacy::PassManager MPM;
> PM.Inliner = createAlwaysInlinerLegacyPass();
> PM.DisableUnrollLoops = true;
> PM.populateFunctionPassManager(FPM);
> PM.populateModulePassManager(MPM);
> FPM.doInitialization();
> for (auto &F : llvm_module)
>     FPM.run(F);
> FPM.doFinalization();
> MPM.run(llvm_module);
> legacy::FunctionPassManager FPM(&llvm_module);
> FPM.add(createDemoteRegisterToMemoryPass());
> FPM.doInitialization();
> for (auto &F : llvm_module)
>     FPM.run(F);
> FPM.doFinalization();
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Hi,
I have since fixed it. I was missing setting the following two flags to
false.


* PM.LoopVectorize = false; PM.SLPVectorize = false;*

Thanks,
Akash.

On Mon, Apr 6, 2020 at 1:24 AM Michael Kruse <llvmdev at meinersbur.de>
wrote:
> It would be helpful to know in which cases your custom pipeline
> vectorizes when it should not.
> Note this might be dependent on target-specifics, such as
> PMB.LibraryInfo tjat your code below is not using.
>
> Michael
>
>
> Am Sa., 4. Apr. 2020 um 12:36 Uhr schrieb Akash Banerjee via llvm-dev
> <llvm-dev at lists.llvm.org>:
> >
> > Hi,
> > I would like to run the -O1 pass sequence followed by -reg2mem from an
> out of tree project which uses llvm.
> > I am using the following code snippet to do so but in some cases, my
> method is also vectorising the code, which doesn't happen when running
the
> same sequence(-S -O1 -reg2mem) through opt. Can someone please help me find
> what I am missing?
> >
> > Thanks,
> > Akash.
> >
> > PassManagerBuilder PM;
> > PM.OptLevel = 1;
> > PM.SizeLevel = 0;
> > legacy::FunctionPassManager FPM(&llvm_module);
> > legacy::PassManager MPM;
> > PM.Inliner = createAlwaysInlinerLegacyPass();
> > PM.DisableUnrollLoops = true;
> > PM.populateFunctionPassManager(FPM);
> > PM.populateModulePassManager(MPM);
> > FPM.doInitialization();
> > for (auto &F : llvm_module)
> >     FPM.run(F);
> > FPM.doFinalization();
> > MPM.run(llvm_module);
> > legacy::FunctionPassManager FPM(&llvm_module);
> > FPM.add(createDemoteRegisterToMemoryPass());
> > FPM.doInitialization();
> > for (auto &F : llvm_module)
> >     FPM.run(F);
> > FPM.doFinalization();
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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