[PATCH] D133946: [CodeGen] Don't zero callee-save registers with zero-call-used-regs (PR57692)

[Nikita Popov via Phabricator via llvm-commits]

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Callee save registers must be preserved, so `-fzero-call-used-regs` should not be zeroing them. The previous implementation only did not zero callee save registers that were saved&restored inside the function, but we need preserve all of them

Fixes https://github.com/llvm/llvm-project/issues/57692.


https://reviews.llvm.org/D133946

Files:
  llvm/lib/CodeGen/PrologEpilogInserter.cpp
  llvm/test/CodeGen/AArch64/zero-call-used-regs.ll
  llvm/test/CodeGen/X86/zero-call-used-regs.ll

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