[all-commits] [llvm/llvm-project] 1f93b1: Support repeated machine outlining

[jinlin-bayarea via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 1f93b162fc6bed2e7763ac6c35cf51741014400e
      https://github.com/llvm/llvm-project/commit/1f93b162fc6bed2e7763ac6c35cf51741014400e
  Author: Jin Lin <jinl at uber.com>
  Date:   2020-03-17 (Tue, 17 Mar 2020)

  Changed paths:
    M llvm/lib/CodeGen/MachineOutliner.cpp
    A llvm/test/CodeGen/AArch64/machine-outliner-iterative.mir

  Log Message:
  -----------
  Support repeated machine outlining

Summary: The following change is to allow the machine outlining can be applied for Nth times, where N is specified by the compiler option. By default the value of N is 1. The motivation is that the repeated machine outlining can further reduce code size.  Please refer to the presentation "Improving Swift Binary Size via Link Time Optimization" in LLVM Developers' Meeting in 2019.

Reviewers: aschwaighofer, tellenbach, paquette

Reviewed By: paquette

Subscribers: tellenbach, hiraditya, llvm-commits, jinlin

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71027