[PATCH] D132073: [CodeGen] Zero out only modified registers

[Bill Wendling via Phabricator via llvm-commits]

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Zeroing out used, but not modified, registers can destroy the contents
of non-volatile registers. This can lead to programs crashing in horky
ways.

Because of this, I'm wary of the -fzero-call-used-regs feature with the
"all-*" options. It would have to be used with great care, which means
it probably has an extremely limited use.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132073

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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