[PATCH] D27329: AArch64CollectLOH: Rewrite as block-local analysis.

[Matthias Braun via Phabricator via llvm-commits]

MatzeB created this revision.
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Previously this pass was using up to 5% compiletime in some cases which
is a bit much for what it is doing. The pass featured a full blown
dataflow analysis which in the default configuration was restricted to a
single block.

This rewrites the pass under the assumption that we only ever work on a
single block. It now works in a single pass just maintaining a small state
machines per tracked physreg. This makes the pass 5-10x faster.


Repository:
  rL LLVM

https://reviews.llvm.org/D27329

Files:
  lib/Target/AArch64/AArch64CollectLOH.cpp
  test/CodeGen/AArch64/arm64-collect-loh-garbage-crash.ll
  test/CodeGen/AArch64/arm64-collect-loh-str.ll
  test/CodeGen/AArch64/arm64-collect-loh.ll

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