[all-commits] [llvm/llvm-project] 11dccf: Recommit "[SCEV] Look through single value PHIs."

[Florian Hahn via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 11dccf8d3aa5d55210f8b886fb21926c7a8353ca
      https://github.com/llvm/llvm-project/commit/11dccf8d3aa5d55210f8b886fb21926c7a8353ca
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2020-09-21 (Mon, 21 Sep 2020)

  Changed paths:
    M llvm/lib/Analysis/ScalarEvolution.cpp
    M llvm/test/Analysis/ScalarEvolution/solve-quadratic-i1.ll
    M llvm/test/Analysis/ScalarEvolution/solve-quadratic-overflow.ll
    M llvm/test/Transforms/LoopStrengthReduce/funclet.ll

  Log Message:
  -----------
  Recommit "[SCEV] Look through single value PHIs."

This commit was originally because it was suspected to cause a crash,
but a reproducer did not surface.

A crash that was exposed by this change was fixed in 1d8f2e52925b.

This reverts the revert commit 0581c0b0eeba03da590d1176a4580cf9b9e8d1e3.