[all-commits] [llvm/llvm-project] 836c7d: DAG: Fix getNode dropping flags if there's a glue ...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 836c7dcf1238683ff18882affac1dae5ae5c5f79
      https://github.com/llvm/llvm-project/commit/836c7dcf1238683ff18882affac1dae5ae5c5f79
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-06-01 (Mon, 01 Jun 2020)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

  Log Message:
  -----------
  DAG: Fix getNode dropping flags if there's a glue output

The AMDGPU non-strict fdiv lowering needs to introduce an FP mode
switch in some cases, and has custom nodes to provide chain/glue for
the intermediate FP operations. We need to propagate nofpexcept here,
but getNode was dropping the flags.

Adding nofpexcept in the AMDGPU custom lowering is left to a future
patch.

Also fix a second case where flags were dropped, but in this case it
seems it just didn't handle this number of operands.

Test will be included in future AMDGPU patch.