[all-commits] [llvm/llvm-project] 1cf3b7: [IPO] Remove IR Outliner (#211971)

[Sam Elliott via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1cf3b70dab75e05516d97ce3d71d7a7495c7fcad
      https://github.com/llvm/llvm-project/commit/1cf3b70dab75e05516d97ce3d71d7a7495c7fcad
  Author: Sam Elliott <aelliott at qti.qualcomm.com>
  Date:   2026-07-31 (Fri, 31 Jul 2026)

  Changed paths:
    M llvm/docs/ReleaseNotes.md
    R llvm/include/llvm/Analysis/IRSimilarityIdentifier.h
    M llvm/include/llvm/InitializePasses.h
    R llvm/include/llvm/Transforms/IPO/IROutliner.h
    M llvm/lib/Analysis/Analysis.cpp
    M llvm/lib/Analysis/CMakeLists.txt
    R llvm/lib/Analysis/IRSimilarityIdentifier.cpp
    M llvm/lib/Passes/PassBuilder.cpp
    M llvm/lib/Passes/PassBuilderPipelines.cpp
    M llvm/lib/Passes/PassRegistry.def
    M llvm/lib/Transforms/IPO/CMakeLists.txt
    R llvm/lib/Transforms/IPO/IROutliner.cpp
    R llvm/test/Analysis/IRSimilarityIdentifier/basic.ll
    R llvm/test/Analysis/IRSimilarityIdentifier/debug-inst-starts-block.ll
    R llvm/test/Analysis/IRSimilarityIdentifier/different.ll
    R llvm/test/Analysis/IRSimilarityIdentifier/nothing.ll
    M llvm/test/CMakeLists.txt
    R llvm/test/DebugInfo/AArch64/ir-outliner.ll
    M llvm/test/Other/new-pm-defaults.ll
    R llvm/test/Transforms/IROutliner/alloca-addrspace-1.ll
    R llvm/test/Transforms/IROutliner/alloca-addrspace.ll
    R llvm/test/Transforms/IROutliner/different-intrinsics.ll
    R llvm/test/Transforms/IROutliner/different-order-phi-merges.ll
    R llvm/test/Transforms/IROutliner/duplicate-merging-phis.ll
    R llvm/test/Transforms/IROutliner/exit-block-phi-node-value-attribution.ll
    R llvm/test/Transforms/IROutliner/exit-phi-nodes-incoming-value-constant-argument.ll
    R llvm/test/Transforms/IROutliner/extraction.ll
    R llvm/test/Transforms/IROutliner/gvn-output-set-overload.ll
    R llvm/test/Transforms/IROutliner/gvn-phi-debug.ll
    R llvm/test/Transforms/IROutliner/illegal-allocas.ll
    R llvm/test/Transforms/IROutliner/illegal-assumes.ll
    R llvm/test/Transforms/IROutliner/illegal-branches.ll
    R llvm/test/Transforms/IROutliner/illegal-callbr.ll
    R llvm/test/Transforms/IROutliner/illegal-catchpad.ll
    R llvm/test/Transforms/IROutliner/illegal-cleanup.ll
    R llvm/test/Transforms/IROutliner/illegal-frozen.ll
    R llvm/test/Transforms/IROutliner/illegal-indirect-calls.ll
    R llvm/test/Transforms/IROutliner/illegal-invoke.ll
    R llvm/test/Transforms/IROutliner/illegal-landingpad.ll
    R llvm/test/Transforms/IROutliner/illegal-memcpy.ll
    R llvm/test/Transforms/IROutliner/illegal-memmove.ll
    R llvm/test/Transforms/IROutliner/illegal-memset.ll
    R llvm/test/Transforms/IROutliner/illegal-nomerge.ll
    R llvm/test/Transforms/IROutliner/illegal-phi-nodes.ll
    R llvm/test/Transforms/IROutliner/illegal-returns-twice.ll
    R llvm/test/Transforms/IROutliner/illegal-typeid-for.ll
    R llvm/test/Transforms/IROutliner/illegal-vaarg.ll
    R llvm/test/Transforms/IROutliner/included-phi-nodes-begin.ll
    R llvm/test/Transforms/IROutliner/included-phi-nodes-end.ll
    R llvm/test/Transforms/IROutliner/legal-debug.ll
    R llvm/test/Transforms/IROutliner/legal-indirect-calls.ll
    R llvm/test/Transforms/IROutliner/mismatched-phi-exits-not-in-first-outlined.ll
    R llvm/test/Transforms/IROutliner/mismatched-phi-exits.ll
    R llvm/test/Transforms/IROutliner/mismatched-phi-outputs-ordering.ll
    R llvm/test/Transforms/IROutliner/must-capture-all-phi-nodes-begin.ll
    R llvm/test/Transforms/IROutliner/must-capture-all-phi-nodes-end.ll
    R llvm/test/Transforms/IROutliner/no-external-block-entries.ll
    R llvm/test/Transforms/IROutliner/no-outlining-optnone.ll
    R llvm/test/Transforms/IROutliner/nooutline-attribute.ll
    R llvm/test/Transforms/IROutliner/one-external-incoming-block-phi-node.ll
    R llvm/test/Transforms/IROutliner/opt-remarks.ll
    R llvm/test/Transforms/IROutliner/outline-memcpy.ll
    R llvm/test/Transforms/IROutliner/outline-memmove.ll
    R llvm/test/Transforms/IROutliner/outline-memset.ll
    R llvm/test/Transforms/IROutliner/outline-vaarg-intrinsic.ll
    R llvm/test/Transforms/IROutliner/outlining-across-branch.ll
    R llvm/test/Transforms/IROutliner/outlining-address-taken.ll
    R llvm/test/Transforms/IROutliner/outlining-basic-branches.ll
    R llvm/test/Transforms/IROutliner/outlining-bitcasts.ll
    R llvm/test/Transforms/IROutliner/outlining-branches-phi-nodes.ll
    R llvm/test/Transforms/IROutliner/outlining-call-and-indirect.ll
    R llvm/test/Transforms/IROutliner/outlining-calls-names-must-match.ll
    R llvm/test/Transforms/IROutliner/outlining-calls.ll
    R llvm/test/Transforms/IROutliner/outlining-commutative-fp.ll
    R llvm/test/Transforms/IROutliner/outlining-commutative-operands-opposite-order.ll
    R llvm/test/Transforms/IROutliner/outlining-commutative.ll
    R llvm/test/Transforms/IROutliner/outlining-compatible-and-attribute-transfer.ll
    R llvm/test/Transforms/IROutliner/outlining-compatible-and-never-transfer-riscv.ll
    R llvm/test/Transforms/IROutliner/outlining-compatible-or-attribute-transfer.ll
    R llvm/test/Transforms/IROutliner/outlining-constants-vs-registers.ll
    R llvm/test/Transforms/IROutliner/outlining-cost-model.ll
    R llvm/test/Transforms/IROutliner/outlining-debug-statements.ll
    R llvm/test/Transforms/IROutliner/outlining-different-constants.ll
    R llvm/test/Transforms/IROutliner/outlining-different-globals.ll
    R llvm/test/Transforms/IROutliner/outlining-different-output-blocks.ll
    R llvm/test/Transforms/IROutliner/outlining-different-structure.ll
    R llvm/test/Transforms/IROutliner/outlining-exits-to-phi-node.ll
    R llvm/test/Transforms/IROutliner/outlining-first-instruction.ll
    R llvm/test/Transforms/IROutliner/outlining-gep.ll
    R llvm/test/Transforms/IROutliner/outlining-isomorphic-predicates.ll
    R llvm/test/Transforms/IROutliner/outlining-larger-size-commutative.ll
    R llvm/test/Transforms/IROutliner/outlining-multiple-exits-diff-outputs.ll
    R llvm/test/Transforms/IROutliner/outlining-multiple-exits-one-output-set.ll
    R llvm/test/Transforms/IROutliner/outlining-multiple-exits.ll
    R llvm/test/Transforms/IROutliner/outlining-musttail.ll
    R llvm/test/Transforms/IROutliner/outlining-no-return-functions.ll
    R llvm/test/Transforms/IROutliner/outlining-odr.ll
    R llvm/test/Transforms/IROutliner/outlining-remapped-outputs.ll
    R llvm/test/Transforms/IROutliner/outlining-same-constants.ll
    R llvm/test/Transforms/IROutliner/outlining-same-globals.ll
    R llvm/test/Transforms/IROutliner/outlining-same-output-blocks.ll
    R llvm/test/Transforms/IROutliner/outlining-special-state.ll
    R llvm/test/Transforms/IROutliner/outlining-strip-loop-info.ll
    R llvm/test/Transforms/IROutliner/outlining-swift-error.ll
    R llvm/test/Transforms/IROutliner/outlining-swifttailcc.ll
    R llvm/test/Transforms/IROutliner/outlining-tailcc.ll
    R llvm/test/Transforms/IROutliner/phi-node-exit-path-order.ll
    R llvm/test/Transforms/IROutliner/phi-nodes-non-constant.ll
    R llvm/test/Transforms/IROutliner/phi-nodes-output-overload.ll
    R llvm/test/Transforms/IROutliner/phi-nodes-parent-block-referential.ll
    R llvm/test/Transforms/IROutliner/phi-nodes-simple.ll
    R llvm/test/Transforms/IROutliner/region-end-of-module.ll
    R llvm/test/Transforms/IROutliner/region-inputs-in-phi-nodes.ll
    M llvm/test/lit.cfg.py
    R llvm/test/tools/llvm-sim/Inputs/sim1.ll
    R llvm/test/tools/llvm-sim/fail-cases.test
    R llvm/test/tools/llvm-sim/single-sim-file.test
    R llvm/test/tools/llvm-sim/single-sim.test
    R llvm/tools/llvm-sim/CMakeLists.txt
    R llvm/tools/llvm-sim/llvm-sim.cpp
    M llvm/unittests/Analysis/CMakeLists.txt
    R llvm/unittests/Analysis/IRSimilarityIdentifierTest.cpp
    M llvm/utils/gn/secondary/llvm/lib/Analysis/BUILD.gn
    M llvm/utils/gn/secondary/llvm/lib/Transforms/IPO/BUILD.gn
    M llvm/utils/gn/secondary/llvm/test/BUILD.gn
    R llvm/utils/gn/secondary/llvm/tools/llvm-sim/BUILD.gn
    M llvm/utils/gn/secondary/llvm/unittests/Analysis/BUILD.gn
    M llvm/utils/profcheck-xfail.txt
    M utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

  Log Message:
  -----------
  [IPO] Remove IR Outliner (#211971)

The IR Outliner has major bugs and no active maintainer, and is disabled
by default. The new LLVM Policy states the pass should be removed.

This commit removes:
- The IROutliner pass
- The IRSimilarity analysis
- The `llvm-sim` executable, used for understanding the latter
- All tests of the above

Related discussion:
https://discourse.llvm.org/t/ir-outliner-status-interest/89672



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