[PATCH] D134495: [X86] Use BuildStackAdjustment in stack probes

[Josh Stone via Phabricator via llvm-commits]

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This has the advantage of dealing with live EFLAGS, using LEA instead of
SUB if needed to avoid clobbering. That also respects feature "lea-sp".

We could allow unrolled stack probing from blocks with live-EFLAGS, if
canUseAsEpilogue learns when emitStackProbeInlineGeneric will be used.

Depends on D134494 <https://reviews.llvm.org/D134494>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134495

Files:
  llvm/lib/Target/X86/X86FrameLowering.cpp
  llvm/test/CodeGen/X86/probe-stack-eflags.ll

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