[PATCH] D125415: [ARM64EC 4/?] Add LLVM support for varargs calling convention.

[Eli Friedman via Phabricator via llvm-commits]

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Part of patchset to add initial support for ARM64EC.

The ARM64EC calling convention is the same as ARM64 for non-varargs functions, but for varargs, the convention is significantly different.  Basically, only x0-x3 registers are used for passing arguments, and x4 and x5 describe the address/size of the arguments passed in memory.  (See https://docs.microsoft.com/en-us/windows/uwp/porting/arm64ec-abi for more details; see https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention for the x64 calling convention rules, which this convention needs to match.)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125415

Files:
  llvm/lib/Target/AArch64/AArch64CallingConvention.h
  llvm/lib/Target/AArch64/AArch64CallingConvention.td
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
  llvm/test/CodeGen/AArch64/arm64ec-varargs.ll

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