[all-commits] [llvm/llvm-project] 8d5a98: Revert "[SimplifyCFG] Update FoldBranchToCommonDes...

[Mehdi Amini via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8d5a981a135a0f0ae0a10c59b7c8093aae1c28de
      https://github.com/llvm/llvm-project/commit/8d5a981a135a0f0ae0a10c59b7c8093aae1c28de
  Author: Mehdi Amini <joker.eph at gmail.com>
  Date:   2021-03-08 (Mon, 08 Mar 2021)

  Changed paths:
    M llvm/include/llvm/IR/IRBuilder.h
    M llvm/include/llvm/Transforms/Utils/Local.h
    M llvm/lib/Transforms/Utils/SimplifyCFG.cpp
    M llvm/test/Transforms/PGOProfile/chr.ll
    M llvm/test/Transforms/SimplifyCFG/ARM/branch-fold-threshold.ll
    M llvm/test/Transforms/SimplifyCFG/annotations.ll
    M llvm/test/Transforms/SimplifyCFG/common-dest-folding.ll
    M llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll
    M llvm/test/Transforms/SimplifyCFG/fold-debug-location.ll
    M llvm/test/Transforms/SimplifyCFG/preserve-branchweights.ll
    M llvm/test/Transforms/SimplifyCFG/switch_create-custom-dl.ll

  Log Message:
  -----------
  Revert "[SimplifyCFG] Update FoldBranchToCommonDest to be poison-safe"

This reverts commit 99108c791de0285ee726a10e8274772b18cee73c.
Clang is miscompiling LLVM with this change, a stage-2 build hits
multiple failures.

As a repro, I built clang in a stage1 directory and used it this way:

cmake -G Ninja ../llvm \
  -DCMAKE_CXX_COMPILER=`pwd`/../build-stage1/bin/clang++ \
  -DCMAKE_C_COMPILER=`pwd`/../build-stage1/bin/clang \
  -DLLVM_TARGETS_TO_BUILD="X86;NVPTX;AMDGPU" \
  -DLLVM_ENABLE_PROJECTS=mlir \
  -DLLVM_BUILD_EXAMPLES=ON \
  -DCMAKE_BUILD_TYPE=Release \
  -DLLVM_ENABLE_ASSERTIONS=On
ninja check-mlir