[PATCH] D152899: Introduce RThreadAccess pass

[Yevgeny Rouban via Phabricator via llvm-commits]

yrouban created this revision.
yrouban added reviewers: skatkov, danilaml, hfinkel, trong, arsenm.
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If the option -rthread-register=<register-name> is specified then:

- Protect rthread register from register allocation.
- Add rhread register as a base pointer to pointer operand of load and store instructions if the pointer operand has addrspace(X), where X is specified with -rthread-addrspace option (256 by default).

This pass might be useful for Thread Local Access operations with a dedicated TLS register.

RThreadAccess is added to X86 and AArch64 pipeline in addPreISel() and can be added to other targets as needed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152899

Files:
  llvm/include/llvm/Transforms/Scalar/RThreadAccess.h
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/lib/Target/AArch64/AArch64Subtarget.cpp
  llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86RegisterInfo.cpp
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/lib/Transforms/Scalar/CMakeLists.txt
  llvm/lib/Transforms/Scalar/RThreadAccess.cpp
  llvm/test/CodeGen/AArch64/rthread.ll
  llvm/test/CodeGen/X86/named-reg-alloc.ll
  llvm/test/CodeGen/X86/rthread.ll

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