[PATCH] D20769: [IPRA] Interprocedural Register Allocation

[Vivek Pandya via llvm-commits]

vivekvpandya created this revision.
vivekvpandya added reviewers: joker-eph, hfinkel, qcolombet.
vivekvpandya added a subscriber: llvm-commits.

This commit addes pass to change CodeGen order to be bottom up order on Call Graph. The patch for the same has been  provided by dear Mehdi Amini.
    
This commit added required passes for IPRA.
    1) lib/CodeGen/RegUsageInfoCollector.cpp (MachineFunction Pass) to create RegMask based on actual register usage, scheduled at POST-RA
    2) lib/CodeGen/PhysicalRegisterUsageInfo.cpp (Immutable Pass) to store RegMask details for functions which has been processed in bottom up order on Call Graph, Scheduled before RegAllocation.
    3) lib/Target/X86/X86RegUsageInfoPropagate.cpp (Target Specific MachineFunction Pass) to update RegMasks of call instr in caller function based on the RegMask returned by immutable pass, scheduled at Pre-RegAlloc.
    
This commit also addes a method setRegMask() to MachineOperand class.
This commit also addes command line option to enable IPRA -enable-ipra and debug type -debug-only="ipra".

http://reviews.llvm.org/D20769

Files:
  include/llvm/CodeGen/MachineOperand.h
  include/llvm/CodeGen/Passes.h
  include/llvm/CodeGen/PhysicalRegisterUsageInfo.h
  include/llvm/InitializePasses.h
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/PhysicalRegisterUsageInfo.cpp
  lib/CodeGen/RegUsageInfoCollector.cpp
  lib/CodeGen/TargetPassConfig.cpp
  lib/Target/X86/CMakeLists.txt
  lib/Target/X86/X86.h
  lib/Target/X86/X86RegUsageInfoPropagate.cpp
  lib/Target/X86/X86TargetMachine.cpp

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