[all-commits] [llvm/llvm-project] 755f91: [Statepoint] Enable cross block relocates w/vreg l...

[Philip Reames via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 755f91f12cf08da9c6553de901135945f2c6083a
      https://github.com/llvm/llvm-project/commit/755f91f12cf08da9c6553de901135945f2c6083a
  Author: Philip Reames <listmail at philipreames.com>
  Date:   2020-07-29 (Wed, 29 Jul 2020)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
    M llvm/test/CodeGen/X86/statepoint-vreg-details.ll
    M llvm/test/CodeGen/X86/statepoint-vreg.ll

  Log Message:
  -----------
  [Statepoint] Enable cross block relocates w/vreg lowering

This change is mechanical, it just removes the restriction and updates tests.  The key building blocks were submitted in 31342eb and 8fe2abc.

Note that this (and preceeding changes) entirely subsumes D83965.  I did includes a couple of it's tests.

>From the codegen changes, an interesting observation: this doesn't actual reduce spilling, it just let's the register allocator do it's job.  That results in a slightly different overall result which has both pros and cons over the eager spill lowering.  (i.e. We'll have some perf tuning to do once this is stable.)