[all-commits] [llvm/llvm-project] 1a5239: [ARM] r11 is reserved when using -mframe-chain=aap...

[Oliver Stannard via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1a5239251ead73ee57f4e2f7fc93433ac7cf18b1
      https://github.com/llvm/llvm-project/commit/1a5239251ead73ee57f4e2f7fc93433ac7cf18b1
  Author: Oliver Stannard <oliver.stannard at arm.com>
  Date:   2024-06-07 (Fri, 07 Jun 2024)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Basic/CodeGenOptions.h
    M clang/include/clang/Driver/Options.td
    M clang/lib/CodeGen/CGCall.cpp
    M clang/lib/CodeGen/CodeGenModule.cpp
    M clang/lib/Driver/ToolChains/Arch/ARM.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Driver/ToolChains/CommonArgs.cpp
    M llvm/docs/LangRef.rst
    M llvm/include/llvm/Support/CodeGen.h
    M llvm/include/llvm/Target/TargetOptions.h
    M llvm/lib/CodeGen/CommandFlags.cpp
    M llvm/lib/CodeGen/TargetOptionsImpl.cpp
    M llvm/lib/IR/Function.cpp
    M llvm/lib/IR/Verifier.cpp
    M llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
    M llvm/lib/Target/ARM/ARMFeatures.td
    M llvm/lib/Target/ARM/ARMFrameLowering.cpp
    M llvm/lib/Target/ARM/ARMFrameLowering.h
    M llvm/test/CodeGen/ARM/frame-chain-reserved-fp.ll
    M llvm/test/CodeGen/ARM/frame-chain.ll
    M llvm/test/CodeGen/Thumb/frame-access.ll
    M llvm/test/CodeGen/Thumb/frame-chain-reserved-fp.ll
    M llvm/test/CodeGen/Thumb/frame-chain.ll

  Log Message:
  -----------
  [ARM] r11 is reserved when using -mframe-chain=aapcs (#86951)

When using the -mframe-chain=aapcs or -mframe-chain=aapcs-leaf options,
we cannot use r11 as an allocatable register, even if
-fomit-frame-pointer is also used. This is so that r11 will always point
to a valid frame record, even if we don't create one in every function.



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