[all-commits] [llvm/llvm-project] 5e7e21: [DSE, MemorySSA] Use BatchAA for AA queries.

Sat Aug 22 00:45:08 PDT 2020

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 5e7e2162d4468063698c280a41f54ea1178c99df
      https://github.com/llvm/llvm-project/commit/5e7e2162d4468063698c280a41f54ea1178c99df
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2020-08-22 (Sat, 22 Aug 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/AliasAnalysis.h
    M llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp

  Log Message:
  -----------
  [DSE,MemorySSA] Use BatchAA for AA queries.

We can use BatchAA to avoid some repeated AA queries. We only remove
stores, so I think we will get away with using a single BatchAA instance
for the complete run.

The changes in AliasAnalysis.h mirror the changes in D85583.

The change improves compile-time by roughly 1%.
http://llvm-compile-time-tracker.com/compare.php?from=67ad786353dfcc7633c65de11601d7823746378e&to=10529e5b43809808e8c198f88fffd8f756554e45&stat=instructions

This is part of the patches to bring down compile-time to the level
referenced in
http://lists.llvm.org/pipermail/llvm-dev/2020-August/144417.html

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D86275