[all-commits] [llvm/llvm-project] 20957d: [AIX] Add -msave-reg-params to save arguments to s...

[Qiu Chaofan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 20957d20913be92f9d88ea5ce862d898a386dad2
      https://github.com/llvm/llvm-project/commit/20957d20913be92f9d88ea5ce862d898a386dad2
  Author: Qiu Chaofan <qiucofan at cn.ibm.com>
  Date:   2024-07-24 (Wed, 24 Jul 2024)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Driver/Options.td
    M clang/lib/CodeGen/CGCall.cpp
    M clang/lib/Driver/ToolChains/AIX.cpp
    A clang/test/CodeGen/PowerPC/save-reg-params.c
    A clang/test/Driver/aix-save-reg-params.c
    M clang/test/Driver/ppc-unsupported.c
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    A llvm/test/CodeGen/PowerPC/save-reg-params.ll

  Log Message:
  -----------
  [AIX] Add -msave-reg-params to save arguments to stack (#97524)

In PowerPC ABI, a few initial arguments are passed through registers,
but their places in parameter save area are reserved, arguments passed
by memory goes after the reserved location.

For debugging purpose, we may want to save copy of the pass-by-reg
arguments into correct places on stack. The new option achieves by
adding new function level attribute and make argument lowering part
aware of it.



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