[PATCH] D71754: [AArch64] Fix save register pairing for Windows AAPCS

[Sanne Wouda via Phabricator via llvm-commits]

sanwou01 created this revision.
sanwou01 added reviewers: efriedma, sdesmalen, rovka, rengolin, t.p.northover, thegameg, greened.
Herald added subscribers: llvm-commits, hiraditya, kristof.beyls.
Herald added a project: LLVM.

On Windows, when a function does not have an unwind table (for example, EH
filtering funclets), we don't correctly pair FP and LR to form the frame record
in all circumstances.

Fix this by invalidating a pair when the second register is FP when compiling
for Windows, even when CFI is not needed.

Fixes PR44271 introduced by D65653 <https://reviews.llvm.org/D65653>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71754

Files:
  llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
  llvm/test/CodeGen/AArch64/win64-no-uwtable.ll

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