[PATCH] D132844: [WIP][IROutliner] Enable the IR outliner post-link for full LTO

[Lewis Revill via Phabricator via llvm-commits]

lewis-revill created this revision.
lewis-revill added reviewers: paquette, rriddle, jdoerfert.
Herald added subscribers: luke957, simoncook, s.egerton, PkmX, hiraditya, arichardson, inglorion.
Herald added a project: All.
lewis-revill requested review of this revision.
Herald added subscribers: llvm-commits, pcwang-thead.
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This patch simply adds the IR outliner to the pipeline of optimizations run under FullLTO post-link. This seems like the right thing to do to capture more candidates, and it provides a small benefit for code size on Embench on riscv32.

Work in progress because I still need to check which tests need to be updated, but submitted for discussion as is.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132844

Files:
  llvm/lib/Passes/PassBuilderPipelines.cpp


Index: llvm/lib/Passes/PassBuilderPipelines.cpp
===================================================================
--- llvm/lib/Passes/PassBuilderPipelines.cpp
+++ llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -1735,6 +1735,10 @@
   if (EnableHotColdSplit)
     MPM.addPass(HotColdSplittingPass());
 
+  // Enable IR outlining late in the FullLTO post-link pipeline.
+  if (EnableIROutliner)
+    MPM.addPass(IROutlinerPass());
+
   // Add late LTO optimization passes.
   // Delete basic blocks, which optimization passes may have killed.
   MPM.addPass(createModuleToFunctionPassAdaptor(SimplifyCFGPass(


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