[PATCH] D42171: X86CallFrameOptimization: Bail on win64cc calls

[Zvi Rackover via Phabricator via llvm-commits]

zvi created this revision.
zvi added reviewers: DavidKreitzer, MatzeB, rnk.

This transform is not legal for Win64. We already check if MF is
not win64cc, but we also need to check that no transform is applied
on a win64cc call site.
Unfortunately, there is no straightforward way to check the callee's CC,
so we resort to checking the register mask vector for equality to the
Win64-specific entry.

Fixes pr35814


Repository:
  rL LLVM

https://reviews.llvm.org/D42171

Files:
  lib/Target/X86/X86CallFrameOptimization.cpp
  test/CodeGen/X86/movtopush.ll

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