llvm-project

704fc654 - [SelectionDAG] Prefer to use ATOMIC_LOAD extension type over getExtendForAtomicOps() in computeKnownBits/ComputeNumSignBits. (#136600)

[SelectionDAG] Prefer to use ATOMIC_LOAD extension type over getExtendForAtomicOps() in computeKnownBits/ComputeNumSignBits. (#136600) If an ATOMIC_LOAD has ZEXTLOAD/SEXTLOAD extension type we should trust that over getExtendForAtomicOps(). SystemZ is the only target that uses setAtomicLoadExtAction and they return ANY_EXTEND from getExtendForAtomicOps(). So I'm not sure there's a way to get a contradiction currently. Note, type legalization uses getExtendForAtomicOps() when promoting ATOMIC_LOAD so we may not need to check getExtendForAtomicOps() for ATOMIC_LOAD. I have not done much investigating of this.