[PATCH] D141020: [X86][ABI] Don't preserve return regs for preserve_all/preserve_most CCs

[Anton Bikineev via Phabricator via llvm-commits]

AntonBikineev updated this revision to Diff 490337.
AntonBikineev retitled this revision from "[X86][ABI] Clobber %RAX for preserve_allcc and preserve_mostcc CCs" to "[X86][ABI] Don't preserve return regs for preserve_all/preserve_most CCs".
AntonBikineev edited the summary of this revision.
AntonBikineev added a comment.

Ptal. Now the change preserves all the declared callee-saved-regs as long as they are not used to return a value. The change should be backward compatible, assuming the user code was correct.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D141020/new/

https://reviews.llvm.org/D141020

Files:
  llvm/docs/LangRef.rst
  llvm/lib/Target/X86/X86CallingConv.td
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/preserve_allcc64.ll
  llvm/test/CodeGen/X86/preserve_mostcc64.ll

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