[all-commits] [llvm/llvm-project] 570c9b: [MemorySSA] Remove unnecessary MSSA dependencies

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 570c9beb8ebb4bdcc807101518cc36ad5e20797c
      https://github.com/llvm/llvm-project/commit/570c9beb8ebb4bdcc807101518cc36ad5e20797c
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2021-08-16 (Mon, 16 Aug 2021)

  Changed paths:
    M clang/test/CodeGen/thinlto-distributed-newpm.ll
    M llvm/lib/Transforms/Scalar/LoopLoadElimination.cpp
    M llvm/lib/Transforms/Utils/LoopVersioning.cpp
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/novect-lcssa-cfg-invalidation.ll

  Log Message:
  -----------
  [MemorySSA] Remove unnecessary MSSA dependencies

LoopLoadElimination, LoopVersioning and LoopVectorize currently
fetch MemorySSA when construction LoopAccessAnalysis. However,
LoopAccessAnalysis does not actually use MemorySSA and we can pass
nullptr instead.

This saves one MemorySSA calculation in the default pipeline, and
thus improves compile-time.

Differential Revision: https://reviews.llvm.org/D108074