[all-commits] [llvm/llvm-project] 8c249c: [CodeGen][AArch64] Don't split functions with a re...

[Daniel Hoekwater via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8c249c44d41f69c867fcf47f65e4646b626368d7
      https://github.com/llvm/llvm-project/commit/8c249c44d41f69c867fcf47f65e4646b626368d7
  Author: Daniel Hoekwater <hoekwater at google.com>
  Date:   2023-08-24 (Thu, 24 Aug 2023)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetInstrInfo.h
    M llvm/lib/CodeGen/MachineFunctionSplitter.cpp
    M llvm/lib/CodeGen/TargetInstrInfo.cpp
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    M llvm/lib/Target/AArch64/AArch64InstrInfo.h
    M llvm/test/CodeGen/Generic/machine-function-splitter.ll

  Log Message:
  -----------
  [CodeGen][AArch64] Don't split functions with a red zone on AArch64

Because unconditional branch relaxation on AArch64 grows the stack to
spill a register, splitting a function would cause the red zone to be
overwritten. Explicitly disable MFS for such functions.

Differential Revision: https://reviews.llvm.org/D157127