[all-commits] [llvm/llvm-project] 5073a6: [MachineBasicBlock] Explicit FT branching param

[Anshil Gandhi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5073a622a785e8fd542fd15484970a435ef2e3e5
      https://github.com/llvm/llvm-project/commit/5073a622a785e8fd542fd15484970a435ef2e3e5
  Author: Anshil Gandhi <gandhi21299 at gmail.com>
  Date:   2023-01-17 (Tue, 17 Jan 2023)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineBasicBlock.h
    M llvm/lib/CodeGen/BranchRelaxation.cpp
    M llvm/lib/CodeGen/MachineBasicBlock.cpp
    A llvm/test/CodeGen/AMDGPU/branch-relax-indirect-branch.mir

  Log Message:
  -----------
  [MachineBasicBlock] Explicit FT branching param

Introduce a parameter in getFallThrough() to optionally
allow returning the fall through basic block in spite of
an explicit branch instruction to it. This parameter is
set to false by default.

Introduce getLogicalFallThrough() which calls
getFallThrough(false) to obtain the block while avoiding
insertion of a jump instruction to its immediate successor.

This patch also reverts the changes made by D134557 and
solves the case where a jump is inserted after another jump
(branch-relax-no-terminators.mir).

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D140790