[PATCH] D42356: [AArch64] Implement dynamic stack probing for windows

[Martin Storsjö via Phabricator via llvm-commits]

mstorsjo updated this revision to Diff 133838.
mstorsjo edited the summary of this revision.
mstorsjo added a comment.

Structured the code to easier allow adding a darwin specific version of stack probing without conflicting with the windows specific parts here. Added a "return false" in GlobalISel for windows for alloca, to make sure we invoke the proper codegen for this.

On ARM and X86, the implementation of stack probing uses a custom opcode like WIN__CHKSTK - that would allow to more directly emit exactly the intended machine code for this call. Doing it via SelectionDAG is less code but ends up less elegant at -O0 - a compromise I think is ok.


https://reviews.llvm.org/D42356

Files:
  lib/CodeGen/GlobalISel/IRTranslator.cpp
  lib/Target/AArch64/AArch64CallingConvention.td
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AArch64/AArch64RegisterInfo.cpp
  lib/Target/AArch64/AArch64RegisterInfo.h
  test/CodeGen/AArch64/win-alloca.ll
  test/CodeGen/AArch64/win64_vararg.ll

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