[PATCH] D24423: X86: Fold tail calls into conditional branches also for 64-bit (PR26302)

[Hans Wennborg via llvm-commits]

hans created this revision.
hans added a reviewer: mkuper.
hans added a subscriber: llvm-commits.

This extends the optimization in r280832 to also work for 64-bit. The only
quirk is that we can't do this for 64-bit Windows (yet).

https://reviews.llvm.org/D24423

Files:
  lib/Target/X86/X86ExpandPseudo.cpp
  lib/Target/X86/X86InstrControl.td
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86MCInstLower.cpp
  test/CodeGen/X86/conditional-tailcall.ll
  test/CodeGen/X86/shrink-compare.ll

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