[PATCH] D132717: [AArch64] Add an option to reserve physical registers from RA

[Guozhi Wei via Phabricator via llvm-commits]

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This patch adds an option --reserve-regs-for-regalloc, so we can reserve a list of physical registers. These registers will not be used by register allocator, but can still be used as ABI requests such as passing arguments to function call.

Its main purpose is simulating high register pressure by reserving many physical registers. So it will be much easier to test and debug register allocation changes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132717

Files:
  llvm/include/llvm/CodeGen/TargetRegisterInfo.h
  llvm/lib/CodeGen/MachineRegisterInfo.cpp
  llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
  llvm/lib/Target/AArch64/AArch64RegisterInfo.h
  llvm/lib/Target/AArch64/AArch64Subtarget.cpp
  llvm/lib/Target/AArch64/AArch64Subtarget.h
  llvm/test/CodeGen/AArch64/arm64-platform-reg.ll

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