[PATCH] D72299: [DSE] Improve mayThrowBetween for 2 instructions in the same BB.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: dmgreen, rnk, efriedma, bryant, asbirlea, Tyker.
Herald added subscribers: jfb, hiraditya.
Herald added a project: LLVM.

This patch adds a way to quickly check if there are throwing instructions
between two instructions in the same basic block.

To do so, we first number all instructions in a BB starting from 0 and
incrementing the counter every time we hit a throwing instruction. If
2 instructions have the same number, there is no throwing instruction
between them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72299

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
  llvm/test/Transforms/DeadStoreElimination/MSSA/combined-partial-overwrites.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll

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