[IPSCCP] Move the IPSCCP run function under the IPO directory.

[labrinea]

Summary

The LLVMipo library no longer depends on the Scalar component. The shared functions between IPSCCP and SCCP have been moved under Utils, in the SCCPSolver.

This is preliminary work for D126455, in order to break cyclic dependecy of LLVM libraries.

[labrinea]

llvm/lib/Transforms/Scalar/SCCP.cpp

61–64

Some of these were used in IPSCCP, but it seems wrong to me. Now that I've separated SCCP from IPSCCP, I've duplicated any shared statistics.

[labrinea]

Rebase

[labrinea]

The previous commit regressed some buildbots:

undefined reference to `llvm::createBitTrackingDCEPass()'
undefined reference to `llvm::createAlignmentFromAssumptionsPass()'
undefined reference to `llvm::createLoopUnrollPass(int, bool, bool, int, int, int, int, int, int)'
undefined reference to `llvm::createLICMPass(unsigned int, unsigned int, bool)'
undefined reference to `llvm::createWarnMissedTransformationsPass()'
undefined reference to `llvm::createAlignmentFromAssumptionsPass()'
undefined reference to `llvm::createCallSiteSplittingPass()'
undefined reference to `llvm::createCFGSimplificationPass(llvm::SimplifyCFGOptions, std::function<bool (llvm::Function const&)>)'
undefined reference to `llvm::createFloat2IntPass()'
undefined reference to `llvm::createLowerConstantIntrinsicsPass()'
undefined reference to `llvm::createLoopRotatePass(int, bool)'
undefined reference to `llvm::createLoopDistributePass()'
undefined reference to `llvm::createLoopSinkPass()'
undefined reference to `llvm::createInstSimplifyLegacyPass()'
undefined reference to `llvm::createDivRemPairsPass()'
undefined reference to `llvm::createCFGSimplificationPass(llvm::SimplifyCFGOptions, std::function<bool (llvm::Function const&)>)'
undefined reference to `llvm::SetLicmMssaOptCap'
undefined reference to `llvm::SetLicmMssaNoAccForPromotionCap'
undefined reference to `llvm::ForgetSCEVInLoopUnroll'

This is fixed by reintroducing one of the two occurences of 'Scalar' under the LINK_COMPONENTS.

[thakis]

llvm/lib/Transforms/IPO/CMakeLists.txt

69

Since this is now still here, doesn't this render "The LLVMipo library no longer depends on the Scalar component." incorrect?

[labrinea]

llvm/lib/Transforms/IPO/CMakeLists.txt

69

Right. The commit message is outdated. What this patch achieves is that D126455 no longer needs to add Scalar->IPO dependency which would create a cycle.