[PATCH] D154281: [CodeGen] Store SP adjustment in MachineBasicBlock. NFCI.

[Jay Foad via Phabricator via llvm-commits]

foad created this revision.
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Record the SP adjustment on entry to each basic block. This is almost
always zero except on targets like ARM which can split a basic block in
the middle of a call sequence.

This simplifies PEI::replaceFrameIndices which previously had to visit
basic blocks in a specific order and had special handling for
unreachable blocks. More importantly it paves the way for an equally
simple implementation of a backwards version of replaceFrameIndices,
which is required to fully convert PrologEpilogInserter to backwards
register scavenging, which is preferred because it does not rely on
accurate kill flags.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154281

Files:
  llvm/include/llvm/CodeGen/MachineBasicBlock.h
  llvm/lib/CodeGen/PrologEpilogInserter.cpp
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/ARM/ARMISelLowering.h

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