SuccessChanges

Summary

  1. [MIR] Add simple PRE pass to MachineCSE This is the second part of the commit fixing PR38917 (hoisting partitially redundant machine instruction). Most of PRE (partitial redundancy elimination) and CSE work is done on LLVM IR, but some of redundancy arises during DAG legalization. Machine CSE is not enough to deal with it. This simple PRE implementation works a little bit intricately: it passes before CSE, looking for partitial redundancy and transforming it to fully redundancy, anticipating that the next CSE step will eliminate this created redundancy. If CSE doesn't eliminate this, than created instruction will remain dead and eliminated later by Remove Dead Machine Instructions pass. The third part of the commit is supposed to refactor MachineCSE, to make it more clear and to merge MachinePRE with MachineCSE, so one need no rely on further Remove Dead pass to clear instrs not eliminated by CSE. First step: https://reviews.llvm.org/D54839 Fixes llvm.org/PR38917 This is fixed recommit of r361356 after PowerPC64 multistage build failure.
Revision 362901 by anton-afanasyev:
[MIR] Add simple PRE pass to MachineCSE

This is the second part of the commit fixing PR38917 (hoisting
partitially redundant machine instruction). Most of PRE (partitial
redundancy elimination) and CSE work is done on LLVM IR, but some of
redundancy arises during DAG legalization. Machine CSE is not enough
to deal with it. This simple PRE implementation works a little bit
intricately: it passes before CSE, looking for partitial redundancy
and transforming it to fully redundancy, anticipating that the next
CSE step will eliminate this created redundancy. If CSE doesn't
eliminate this, than created instruction will remain dead and eliminated
later by Remove Dead Machine Instructions pass.

The third part of the commit is supposed to refactor MachineCSE,
to make it more clear and to merge MachinePRE with MachineCSE,
so one need no rely on further Remove Dead pass to clear instrs
not eliminated by CSE.

First step: https://reviews.llvm.org/D54839

Fixes llvm.org/PR38917

This is fixed recommit of r361356 after PowerPC64 multistage build failure.
Change TypePath in RepositoryPath in Workspace
The file was modified/llvm/trunk/lib/CodeGen/MachineCSE.cpptrunk/lib/CodeGen/MachineCSE.cpp
The file was modified/llvm/trunk/test/CodeGen/X86/avx2-masked-gather.lltrunk/test/CodeGen/X86/avx2-masked-gather.ll
The file was modified/llvm/trunk/test/CodeGen/X86/masked_compressstore.lltrunk/test/CodeGen/X86/masked_compressstore.ll
The file was modified/llvm/trunk/test/CodeGen/X86/masked_gather.lltrunk/test/CodeGen/X86/masked_gather.ll
The file was modified/llvm/trunk/test/CodeGen/X86/masked_store.lltrunk/test/CodeGen/X86/masked_store.ll
The file was modified/llvm/trunk/test/CodeGen/X86/masked_store_trunc.lltrunk/test/CodeGen/X86/masked_store_trunc.ll
The file was modified/llvm/trunk/test/CodeGen/X86/masked_store_trunc_ssat.lltrunk/test/CodeGen/X86/masked_store_trunc_ssat.ll
The file was modified/llvm/trunk/test/CodeGen/X86/masked_store_trunc_usat.lltrunk/test/CodeGen/X86/masked_store_trunc_usat.ll