[PATCH] D100290: [PowerPC] Don't probe in redzone

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
lkail added reviewers: jsji, PowerPC.
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When `-fstack-clash-protection` is enabled and stack has to be realigned, some parts of redzone is written prior the probe, so probe might overwrite content already written in redzone. To avoid it, the implementation should skip redzone when probing. Safety is still guaranteed since write in redzone is considered to be free probe.

This fixes https://bugs.llvm.org/show_bug.cgi?id=49903.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100290

Files:
  llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
  llvm/test/CodeGen/PowerPC/pr46759.ll
  llvm/test/CodeGen/PowerPC/stack-clash-prologue.ll

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