[all-commits] [llvm/llvm-project] a418fa: [win][aarch64] Add support for detecting the Host ...

[Daniel Paoliello via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a418fa7cdcf4f334a1955389fcec483ea2c77c44
      https://github.com/llvm/llvm-project/commit/a418fa7cdcf4f334a1955389fcec483ea2c77c44
  Author: Daniel Paoliello <danpao at microsoft.com>
  Date:   2025-08-06 (Wed, 06 Aug 2025)

  Changed paths:
    M llvm/include/llvm/TargetParser/Host.h
    M llvm/lib/TargetParser/Host.cpp
    M llvm/unittests/TargetParser/Host.cpp

  Log Message:
  -----------
  [win][aarch64] Add support for detecting the Host CPU on Arm64 Windows (#151596)

Uses the `CP 4000` registry keys under
`HKLM\HARDWARE\DESCRIPTION\System\CentralProcessor\*` to get the
Implementer and Part, which is then provided to a modified form of
`getHostCPUNameForARM` to map to a CPU.

On my local Surface Pro 11 `llc --version` reports:
```
> .\build\bin\llc.exe --version
LLVM (http://llvm.org/):
  LLVM version 22.0.0git
  Optimized build with assertions.
  Default target: aarch64-pc-windows-msvc
  Host CPU: oryon-1
```



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