[PATCH] D148010: [Pipelines] Don't run module optimization in full LTO pre-link

[Nikita Popov via Phabricator via llvm-commits]

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When LTO is used, the pre-link pipeline is supposed to only perform module simplification, but not optimization. The post-link pipeline is responsible for optimization. In particular, we should not perform size increasing optimizations like loop vectorization and runtime unrolling before the second inlining run in the post-link pipeline.

This is already handled correctly by the thin LTO pipeline, but not the full LTO pipeline. This patch effectively makes the pre-link pipelines for thin/full LTO the same. (There is a minor difference in a single GlobalDCE run that possibly shouldn't be there, but I'm leaving it for now.)


https://reviews.llvm.org/D148010

Files:
  llvm/include/llvm/Passes/PassBuilder.h
  llvm/lib/Passes/PassBuilderPipelines.cpp
  llvm/test/Other/new-pm-defaults.ll
  llvm/test/Other/new-pm-lto-prelink-defaults.ll
  llvm/test/Other/new-pm-thinlto-prelink-defaults.ll

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