[PATCH] D102805: [M68k] Allow user to preserve certain registers

[Min-Yih Hsu via Phabricator via cfe-commits]

myhsu created this revision.
myhsu added reviewers: nickdesaulniers, simoncook.
Herald added subscribers: dang, s.egerton, hiraditya.
myhsu requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.

Add `-ffixed-a[0-6]` and `-ffixed-d[0-7]` driver flags and the corresponding subtarget features to prevent certain register from being allocated.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102805

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/Arch/M68k.cpp
  clang/test/Driver/m68k-fixed-register.c
  llvm/lib/Target/M68k/M68k.td
  llvm/lib/Target/M68k/M68kRegisterInfo.cpp
  llvm/lib/Target/M68k/M68kSubtarget.cpp
  llvm/lib/Target/M68k/M68kSubtarget.h
  llvm/test/CodeGen/M68k/reserved-regs.ll

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