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llvm-project/llvm/test/Transforms/Inline
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Grigory Pastukhov f66bd8e81a
[LLVM] Add flatten function attribute to LLVM IR and implement recursive inlining in AlwaysInliner (#174899) 
This adds a new function-level `flatten` LLVM IR attribute and
implements support for it in the AlwaysInliner pass, bringing LLVM's
behavior in line with GCC.

Previously, the `flatten` attribute only existed as a Clang attribute,
which was lowered to `alwaysinline` on individual call sites. Per the
RFC discussion [1], the consensus was to match GCC semantics:
recursively inline the entire call tree into the
flattened function, rather than just immediate call sites.

This PR:
- Adds the `flatten` function attribute to LLVM IR
- Implements recursive inlining of all viable callees in AlwaysInliner
- Uses inline history tracking to detect and stop at recursive call
cycles
- Emits optimization remarks when inlining is skipped due to recursion

A follow-up patch will update Clang to emit the LLVM `flatten` attribute
on
functions instead of marking individual call sites with `alwaysinline`.

[1]
https://discourse.llvm.org/t/rfc-function-level-flatten-depth-attribute-for-depth-limited-inlining
2026-03-19 11:25:46 -07:00
..
AArch64
[LLVM] Add flatten function attribute to LLVM IR and implement recursive inlining in AlwaysInliner (#174899)
2026-03-19 11:25:46 -07:00
AMDGPU
[AMDGPU] Remove DX10_CLAMP and IEEE bits from gfx1170 (#182107)
2026-03-04 12:16:41 +01:00
ARM
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
Inputs
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LoongArch
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
ML
[mlgo][inliner] Handle recursive cases when skipping non-cold functions (#164099)
2025-10-20 07:28:50 -07:00
PowerPC
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
RISCV
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
SystemZ
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
WebAssembly
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X86
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
2003-09-14-InlineValue.ll
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2003-09-22-PHINodeInlineFail.ll
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2003-09-22-PHINodesInExceptionDest.ll
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2003-09-22-PHINodesInNormalInvokeDest.ll
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2003-10-13-AllocaDominanceProblem.ll
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2004-04-15-InlineDeletesCall.ll
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2004-10-17-InlineFunctionWithoutReturn.ll
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2007-04-15-InlineEH.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
2007-06-25-WeakInline.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
2007-12-19-InlineNoUnwind.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
2008-09-02-NoInline.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
2009-01-08-NoInlineDynamicAlloca.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
2009-01-13-RecursiveInlineCrash.ll
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2009-05-07-CallUsingSelfCrash.ll
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2010-05-12-ValueMap.ll
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access-attributes-prop.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
align.ll
[IR] Convert from nocapture to captures(none) (#123181)
2025-01-29 16:56:47 +01:00
alloca_test.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
alloca-bonus.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
alloca-dbgdeclare.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
alloca-in-scc.ll
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always-inline-attr.ll
[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)
2025-10-23 20:31:31 +08:00
always-inline-bfi.ll
[AlwaysInline] Fix analysis invalidation (#119566)
2024-12-12 12:59:59 +01:00
always-inline-invalidate.ll
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always-inline-phase-ordering.ll
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always-inline-remark.ll
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always-inline.ll
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analysis-invalidation.ll
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arg-attr-propagation.ll
[Inliner] Prevent adding pointer attributes to non-pointer arguments (#115569)
2024-11-09 16:17:16 +00:00
array-alloca.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
assumptions-from-callsite-attrs.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
attributes.ll
[LLVM] Remove "no-nans-fp-math" attribute support (#186285)
2026-03-13 09:29:28 +00:00
basictest.ll
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bfi-update.ll
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blockaddress.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
byref-align.ll
[IR] Convert from nocapture to captures(none) (#123181)
2025-01-29 16:56:47 +01:00
byval_lifetime.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
byval-align.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
byval-dbg.ll
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byval-tail-call.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
byval-with-non-alloca-addrspace.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
byval.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
call-intrinsic-is-constant.ll
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call-intrinsic-objectsize.ll
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call-site-attrs.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
callbr.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
callgraph-update.ll
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casts.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
cfg_preserve_test.ll
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cgscc-cycle-debug.ll
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cgscc-cycle.ll
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cgscc-incremental-invalidate.ll
Revert "[Analysis][EphemeralValuesAnalysis][NFCI] Remove EphemeralValuesCache class (#132454)"
2025-03-22 10:13:39 -07:00
cgscc-inline-replay.ll
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cgscc-invalidate.ll
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cgscc-update.ll
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clear-analyses.ll
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comdat-ipo.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
convergence-inline.ll
[OPT] Search whole BB for convergence token. (#112728)
2024-10-30 11:19:23 -04:00
crash2.ll
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crash-lifetime-marker.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
crash.ll
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debug-info-duplicate-calls.ll
[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)
2025-10-23 20:31:31 +08:00
debug-invoke.ll
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debuginline-cost-delta.ll
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delete-function-with-metadata-use.ll
[RemoveDIs] Remove "try-debuginfo-iterators..." test flags (#130298)
2025-03-14 15:50:49 +00:00
delete-unused-function.ll
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deleted-scc.ll
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deopt-bundles.ll
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deoptimize-intrinsic-attrs.ll
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deoptimize-intrinsic-cconv.ll
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deoptimize-intrinsic.ll
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devirtualize-2.ll
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devirtualize-3.ll
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devirtualize-4.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
devirtualize-5.ll
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devirtualize-6.ll
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devirtualize.ll
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dilocation-loop-metadata-update.ll
[DebugInfo] Handle followup loop metadata in updateLoopMetadataDebugLocations (#157557)
2025-09-25 13:20:55 +00:00
drop-callee-type-metadata.ll
[llvm] Introduce callee_type metadata
2025-07-18 14:40:54 -07:00
dynamic_alloca_test.ll
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dynamic-alloca-simplified-large.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
enable-inline-advisor-printing.ll
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ephemeral.ll
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exponential-deferred-inlining.ll
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externally_available.ll
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flatten.ll
[LLVM] Add flatten function attribute to LLVM IR and implement recursive inlining in AlwaysInliner (#174899)
2026-03-19 11:25:46 -07:00
frameescape.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
function-count-update-2.ll
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function-count-update-3.ll
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function-count-update.ll
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gep_from_constant.ll
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guard-intrinsic.ll
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gvn-inline-iteration.ll
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ignore-debug-info.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
implicit-null-check.ll
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inalloca-not-static.ll
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infinite-loop-two-predecessors.ll
[llvm] Remove br i1 undef from some regression tests [NFC] (#116161)
2024-11-15 14:19:50 +00:00
inline_call.ll
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inline_cleanup.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_constprop.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_dbg_declare.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_dce.ll
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inline_inv_group.ll
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inline_invoke.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_minisize.ll
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inline_negative_result.ll
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inline_noprofile.ll
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inline_prune.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_returns_twice.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_ssp.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_stats.ll
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inline_unreachable-2.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline_unreachable.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-all-viable-calls.ll
[Inliner] Add option (default off) to inline all calls regardless of the cost (#152365)
2025-08-18 17:48:49 +00:00
inline-assume.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-brunch-funnel.ll
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inline-byval-bonus.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-call-penalty-option.ll
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inline-call-with-asm-call.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-cold-callsite-pgo.ll
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inline-cold-callsite.ll
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inline-cold.ll
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inline-constexpr-addrspacecast-argument.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-cost-annotation-pass.ll
[InlineCost] Print inline cost for invoke call sites as well (#114476)
2024-11-01 09:55:17 -07:00
inline-cost-attributes.ll
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inline-cost-benefit-multiplier-override.ll
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inline-cost-dead-users.ll
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inline-cost-switch-default.ll
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inline-deferred-instsimplify.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-drop-attributes.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-fast-math-flags.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-funclets.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-history-noinline.ll
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inline-hot-callsite-2.ll
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inline-hot-callsite.ll
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inline-incompat-attrs.ll
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inline-indirect-chain.ll
[llvm] Remove br i1 undef from some regression tests [NFC] (#116161)
2024-11-15 14:19:50 +00:00
inline-indirect.ll
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inline-invoke-tail.ll
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inline-invoke-with-asm-call.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-min-legal-vector-width.ll
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inline-no-builtin-compatible.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inline-noalias-unidentify-object.ll
[BasicAA][ValueTracking] Increase depth for underlying object search (#143714)
2025-06-12 09:19:50 +02:00
inline-optnone.ll
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inline-optsize.ll
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inline-probe-stack.ll
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inline-ptrtoint-different-sizes.ll
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inline-recur-stacksize.ll
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inline-recursive-fn2.ll
[InlineCost]: Optimize inlining of recursive function. (#139982)
2025-06-04 11:41:55 +01:00
inline-recursive-fn.ll
[InlineCost]: Add a new heuristic to branch folding for better inlining decisions.
2025-05-06 11:25:37 +01:00
inline-ref-metadata.ll
XCOFF associated metadata (#159096)
2026-01-09 13:49:21 -05:00
inline-remark-mandatory.ll
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inline-remark.ll
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inline-retainRV-call.ll
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inline-scalable.ll
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inline-semantic-interposition.ll
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inline-sign-return-address.ll
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inline-skip-use-empty-alloca.ll
[RemoveDIs] Remove "try-debuginfo-iterators..." test flags (#130298)
2025-03-14 15:50:49 +00:00
inline-stack-probe-size.ll
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inline-stacksize.ll
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inline-strictfp.ll
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inline-switch-default-2.ll
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inline-switch-default.ll
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inline-tail.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
inline-threshold.ll
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inline-varargs.ll
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inline-vla.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
inlined-loop-metadata-inseltpoison.ll
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inlined-loop-metadata.ll
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inlined-mustprogress-loop-metadata.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
inlinedefault-threshold.ll
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inlining-advisor-default.ll
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instsimplify-null-pointer-is-valid.ll
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internal-scc-members.ll
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invariant-group-sroa.ll
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invoke_test-1.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
invoke_test-2.ll
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invoke_test-3.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
invoke-cleanup.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
invoke-combine-clauses.ll
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invoke-cost.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
label-annotation.ll
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last-call-bonus.ll
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last-call-no-bonus.ll
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last-callsite.ll
[IR] Remove mul constant expression (#127046)
2025-02-14 09:28:57 +01:00
launder.invariant.group.ll
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lifetime-no-datalayout.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
lifetime.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
local-as-metadata-undominated-use.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
memprof_inline2.ll
[MemProf] Fix discarding of noncold contexts after inlining (#149599)
2025-07-18 21:11:37 -07:00
memprof_inline3.ll
[MemProf] Fix discarding of noncold contexts after inlining (#149599)
2025-07-18 21:11:37 -07:00
memprof_inline.ll
[MemProf] Emit remarks when hinting allocations not needing cloning (#141859)
2025-05-28 16:44:44 -07:00
module-inliner-basic.ll
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module-inlining.ll
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monster_scc.ll
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mut-rec-scc-2.ll
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mut-rec-scc.ll
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nested-inline.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
no-inline-incompatible-gc.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
no-inline-line-tables.ll
[RemoveDIs] Remove "try-debuginfo-iterators..." test flags (#130298)
2025-03-14 15:50:49 +00:00
no-unwind-inline-asm.ll
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noalias2.ll
[IR] Convert from nocapture to captures(none) (#123181)
2025-01-29 16:56:47 +01:00
noalias3.ll
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noalias-calls2.ll
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noalias-calls-always.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
noalias-calls.ll
[IR] Remove size argument from lifetime intrinsics (#150248)
2025-08-08 11:09:34 +02:00
noalias-cs.ll
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noalias-escape-source.ll
[Inline] Only consider provenance captures for scoped alias metadata (#138540)
2025-05-27 15:15:57 +02:00
noalias.ll
[IR] Convert from nocapture to captures(none) (#123181)
2025-01-29 16:56:47 +01:00
noduplicate.ll
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noinline-recursive-fn.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
noinline.ll
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nonnull.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
opaque-ptr.ll
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optimization-remarks-hotness-threshold.ll
[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)
2025-10-23 20:31:31 +08:00
optimization-remarks-passed-deleted-callee-yaml.ll
[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)
2025-10-23 20:31:31 +08:00
optimization-remarks-passed-yaml.ll
[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)
2025-10-23 20:31:31 +08:00
optimization-remarks-with-hotness.ll
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optimization-remarks-yaml.ll
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optimization-remarks.ll
[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)
2025-10-23 20:31:31 +08:00
parallel-loop-md-callee.ll
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parallel-loop-md-merge.ll
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parallel-loop-md.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
partial-inline-act.ll
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partial-inline-incompat-attrs.ll
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pr21206.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
pr22285.ll
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pr26698.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
pr28298.ll
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pr33637.ll
[llvm] Remove br i1 undef from some regression tests [NFC] (#116161)
2024-11-15 14:19:50 +00:00
pr46945.ll
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pr48209.ll
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pr50270.ll
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pr50589.ll
[IR] Replace alignment argument with attribute on masked intrinsics (#163802)
2025-10-20 08:50:09 +00:00
pr52118.ll
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pr53206.ll
[llvm] Remove br i1 undef from some regression tests [NFC] (#116161)
2024-11-15 14:19:50 +00:00
pr64804.ll
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pr97590.ll
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PR4909.ll
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prof-update-instr.ll
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prof-update-sample-alwaysinline.ll
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prof-update-sample.ll
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profile_meta_invoke.ll
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profile-meta.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
promote-call-bitwidth.ll
CallPromotionUtils: Correctly use IndexSize when determining the bit width of pointer offsets. (#119483)
2024-12-11 16:49:48 +13:00
ptr-diff.ll
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recursive.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
redundant-loads.ll
[IR] Only allow lifetime.start/end on allocas (#149310)
2025-07-21 15:04:50 +02:00
ret_attr_align_and_noundef.ll
[Inliner] Fix return attribute propagation across multiple return sites (#186076)
2026-03-16 22:14:11 +01:00
ret_attr_nofpclass.ll
[Inliner] Fix return attribute propagation across multiple return sites (#186076)
2026-03-16 22:14:11 +01:00
ret_attr_update.ll
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simplification-in-loop.ll
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simplified_to.ll
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simplify-crosscallsite.ll
[InlineCost] Simplify extractvalue across callsite (#145054)
2025-06-24 14:15:27 +01:00
simplify-fp128.ll
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simplify-instruction-computeKnownFPClass-context.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
store-sroa.ll
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switch.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
unwind-inline-asm.ll
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update_invoke_prof.ll
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update_value_profile.ll
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vector-bonus.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
vector-no-bonus.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00
zero-cost.ll
[Inline] Remove redundant run lines in tests (#179959)
2026-02-05 07:54:37 -08:00