[PATCH] D89451: [SystemZ] Mark unsaved argument R6 as live throughout function

[Jonas Paulsson via Phabricator via llvm-commits]

jonpa created this revision.
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For historical reasons, the R6 <https://reviews.llvm.org/source/compiler-rt/> register is a callee saved argument register. This means that if it is used to pass an argument to a function that does not clobber it, it is live throughout the function.

This patch makes sure that in this special case any kill flags of it are removed, all MBBs have it in their live-in lists and all return instructions use it.


https://reviews.llvm.org/D89451

Files:
  llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
  llvm/test/CodeGen/SystemZ/frame-26.ll

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