[all-commits] [llvm/llvm-project] 18679a: [PowerPC] Adjust `MaxAtomicSizeInBitsSupported` on...

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18679ac0d7ec0fb3ccd500073827fde76bb206b0
      https://github.com/llvm/llvm-project/commit/18679ac0d7ec0fb3ccd500073827fde76bb206b0
  Author: Kai Luo <lkail at cn.ibm.com>
  Date:   2022-04-09 (Sat, 09 Apr 2022)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/test/CodeGen/PowerPC/atomics-i128.ll
    M llvm/test/Transforms/AtomicExpand/PowerPC/cmpxchg.ll

  Log Message:
  -----------
  [PowerPC] Adjust `MaxAtomicSizeInBitsSupported` on PPC64

AtomicExpandPass uses this variable to determine emitting libcalls or not. The default value is 1024 and if we don't specify it for PPC64 explicitly, AtomicExpandPass won't emit `__atomic_*` libcalls for those target unable to inline atomic ops and finally the backend emits `__sync_*` libcalls. Thanks @efriedma for pointing it out.

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D122868