llvm-project

History

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

Current implementation uses `std::copy` to shift all incoming values
after the removed index. This patch optimizes
`PHINode::removeIncomingValue()` by replacing the linear shift of
incoming values with a swap-with-last strategy.

After this change, the relative order of incoming values after removal
is not preserved.

This improves compile-time for PHI nodes with many predecessors.

Depends:
https://github.com/llvm/llvm-project/pull/171955
https://github.com/llvm/llvm-project/pull/171956
https://github.com/llvm/llvm-project/pull/171960
https://github.com/llvm/llvm-project/pull/171962

2025-12-17 19:44:01 +08:00

AArch64

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

AMDGPU

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

ARM

[IR] Replace alignment argument with attribute on masked intrinsics (#163802 )

2025-10-20 08:50:09 +00:00

branch-weights-freq

[LoopPeel] Fix BFI when peeling last iteration without guard (#168250 )

2025-11-20 10:45:53 -05:00

Hexagon

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

PowerPC

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

RISCV

[RISCV] Don't unroll vectorized loops with vector operands (#171089 )

2025-12-09 12:42:41 +08:00

WebAssembly

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

X86

[RemoveDIs] Remove "try-debuginfo-iterators..." test flags (#130298 )

2025-03-14 15:50:49 +00:00

2004-05-13-DontUnrollTooMuch.ll

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2005-03-06-BadLoopInfoUpdate.ll

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2006-08-24-MultiBlockLoop.ll

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2007-04-16-PhiUpdate.ll

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2007-05-05-UnrollMiscomp.ll

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2007-05-09-UnknownTripCount.ll

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2007-11-05-Crash.ll

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2011-08-08-PhiUpdate.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

2011-08-09-IVSimplify.ll

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2011-08-09-PhiUpdate.ll

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2011-10-01-NoopTrunc.ll

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2012-04-09-unroll-indirectbr.ll

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add-folding-overflow.ll

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assume-timeout.ll

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basic.ll

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callbr.ll

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complete_unroll_profitability_with_assume.ll

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convergent.controlled.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

convergent.ll

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dce.ll

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debug-info.ll

[RemoveDIs] Remove "try-debuginfo-iterators..." test flags (#130298 )

2025-03-14 15:50:49 +00:00

disable_nonforced_count.ll

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disable_nonforced_enable.ll

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disable_nonforced_full.ll

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disable_nonforced.ll

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disable-full-unroll-by-opt.ll

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disable-loop-unrolling_forced.ll

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ephemeral.ll

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epilog_const_phi.ll

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followup.ll

[LoopUnroll][NFCI] Clean up remainder followup metadata handling (#165272 )

2025-10-30 10:57:27 -04:00

full-unroll-avoid-partial.ll

[LoopUnroll] Prevent LoopFullUnrollPass from performing partial unrolling when trip counts are unknown (#165013 )

2025-11-04 09:20:01 -08:00

full-unroll-bad-cost.ll

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full-unroll-crashers.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

full-unroll-heuristics-2.ll

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full-unroll-heuristics-cmp.ll

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full-unroll-heuristics-dce.ll

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full-unroll-heuristics-geps.ll

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full-unroll-heuristics-load-const.ll

[LoopUnrollAnalyzer] Use constant folding API for loads

2024-08-28 11:53:25 +02:00

full-unroll-heuristics-phi-prop.ll

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full-unroll-heuristics.ll

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full-unroll-invariant.ll

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full-unroll-keep-first-exit.ll

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full-unroll-one-unpredictable-exit.ll

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

FullUnroll.ll

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gh-issue77118-broken-lcssa-form.ll

[SimplifyIndVar] LCSSA form is destroyed by simplifyLoopIVs, preserve it (#78696 )

2024-02-21 17:51:56 +05:30

guard-cost-for-unrolling.ll

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high-cost-trip-count-computation.ll

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ignore-annotation-intrinsic-cost.ll

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invalidate_right_loop.ll

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loop-block-disposition-after-full-unroll.ll

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loop-block-disposition-after-loop-peeling.ll

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loop-branch-folding.ll

[LoopUnroll] Make use of MaxTripCount for loops with "#pragma unroll" (#74703 )

2023-12-08 19:43:10 +08:00

loop-probability-one.ll

[LoopUnroll] Fix division by zero (#166258 )

2025-11-04 12:49:33 -05:00

loop-remarks-with-hotness.ll

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loop-remarks.ll

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multiple-exits.ll

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noalias.ll

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nonlatchcondbr.ll

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not-rotated.ll

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opt-levels.ll

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optsize-loop-size.ll

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partial-unroll-const-bounds.ll

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partial-unroll-dead-instructions.ll

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partial-unroll-non-latch-exit.ll

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

partial-unroll-reductions.ll

[LoopUnroll] Introduce parallel accumulators when unrolling FP reductions. (#166630 )

2025-11-27 15:03:36 +00:00

partially-unroll-unconditional-latch.ll

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peel-branch-weights.ll

[LoopPeel] Fix branch weights' effect on block frequencies (#128785 )

2025-10-02 16:07:55 +00:00

peel-last-iteration-debug.ll

[LoopPeel] Add peeling tests with debug value and pointer inductions

2025-05-28 10:07:02 +01:00

peel-last-iteration-expansion-cost.ll

[LP] Assign weights when peeling last iteration. (#166858 )

2025-11-15 10:01:04 -08:00

peel-last-iteration-minmax.ll

[LoopPeel] Support last iteration peeling of min/max intrinsics (#143598 )

2025-06-17 11:22:23 -07:00

peel-last-iteration-multi-exit.ll

[LoopPeel] Add tests for peeling last iteration with multiple exits.

2025-05-23 15:46:34 +01:00

peel-last-iteration-pointer-inductions.ll

[LoopPeel] Add peeling tests with debug value and pointer inductions

2025-05-28 10:07:02 +01:00

peel-last-iteration-with-constant-trip-count.ll

Reapply "[LoopPeel] Remove known trip count restriction when peeling last. (#140792 )"

2025-05-28 13:02:03 +01:00

peel-last-iteration-with-guards.ll

[SCEV] Add tests that benefit from rewriting SCEVAddExpr with guards.

2025-09-20 19:24:19 +01:00

peel-last-iteration-with-variable-trip-count.ll

[LoopPeel] Add test coverage for edge case for peel last

2025-06-10 11:46:06 -07:00

peel-loop2.ll

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peel-loop-and-unroll.ll

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peel-loop-conditions-pgo-1.ll

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peel-loop-conditions-pgo-2.ll

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peel-loop-conditions.ll

[Transforms] Convert tests to opaque pointers (NFC)

2024-02-05 11:57:34 +01:00

peel-loop-inner.ll

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peel-loop-irreducible.ll

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peel-loop-min-max-intrinsics.ll

[LoopPeel] Support min/max intrinsics in loop peeling (#93162 )

2024-05-31 13:58:10 +03:00

peel-loop-negative.ll

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peel-loop-nests.ll

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peel-loop-noalias-scope-decl.ll

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peel-loop-not-forced.ll

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peel-loop-pgo-deopt-idom-2.ll

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peel-loop-pgo-deopt-idom.ll

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peel-loop-pgo-deopt.ll

[LoopPeel] Fix branch weights' effect on block frequencies (#128785 )

2025-10-02 16:07:55 +00:00

peel-loop-pgo.ll

[LoopPeel] Fix branch weights' effect on block frequencies (#128785 )

2025-10-02 16:07:55 +00:00

peel-loop-phi-analysis-iv-not-triggered.ll

[LoopPeel] Add new option to peeling loops to convert PHI into IV (#121104 )

2025-08-20 13:44:56 +00:00

peel-loop-phi-analysis-iv.ll

[LoopPeel] Add new option to peeling loops to convert PHI into IV (#121104 )

2025-08-20 13:44:56 +00:00

peel-loop-phi-analysis.ll

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peel-loop-scev-invalidate-with-overflow-inst.ll

[SCEV] forgetValue: support (with-overflow-inst op0, op1) (#98015 )

2024-07-09 09:14:33 +02:00

peel-loop-scev-invalidate.ll

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peel-loop.ll

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

peel-multiple-unreachable-exits.ll

[IndVars] Strengthen inference of samesign flags (#170363 )

2025-12-03 16:16:22 +00:00

peel-to-turn-invariant-accesses-dereferenceable.ll

[LoopPeel] Check for onlyAccessesInaccessibleMemory instead of llvm.assume in peelToTurnInvariantLoadsDereferenceable. (#171910 )

2025-12-12 10:45:41 -08:00

pr10813.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

pr11361.ll

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pr14167.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

pr18861.ll

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pr27157.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

pr28132.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

pr31718.ll

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pr33437.ll

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pr45939-peel-count-and-complete-unroll.ll

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pr77842.ll

[LoopUnroll] Introduce PragmaUnrollFullMaxIterations as a hard cap on how many iterations we try to unroll (#78648 )

2024-02-05 17:01:00 -08:00

pr109333.ll

[LoopPeel] Fix LCSSA phi node invalidation

2024-09-20 17:01:41 +02:00

pr114879.ll

[SCEV] Disallow simplifying phi(undef, X) to X (#115109 )

2024-11-07 15:53:51 +08:00

pr131465.ll

[SCEV] Check whether the start is non-zero in ScalarEvolution::howFarToZero (#131522 )

2025-03-17 13:59:16 +08:00

preserve-branch-debuglocs.ll

[DebugInfo][LoopUnroll] Preserve DebugLocs on optimized cond branches (#114225 )

2024-11-08 16:52:30 +00:00

rebuild_lcssa.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

revert-D110922.ll

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revisit.ll

[StandardInstrumentation] Annotate loops with the function name (#90756 )

2024-05-03 14:13:59 -04:00

runtime-epilog-debuginfo.ll

[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786 )

2025-10-23 20:31:31 +08:00

runtime-exit-phi-scev-invalidation.ll

[LoopUnroll] Fix block frequencies for epilogue (#159163 )

2025-10-31 11:01:42 -04:00

runtime-i128.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-li.ll

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runtime-loop1.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-loop2.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-loop3.ll

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runtime-loop4.ll

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runtime-loop5.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-loop-at-most-two-exits.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-loop-branchweight.ll

[LoopUnroll] Fix block frequencies for epilogue (#159163 )

2025-10-31 11:01:42 -04:00

runtime-loop-known-exit.ll

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runtime-loop-multiexit-dom-verify.ll

[IndVars] Strengthen inference of samesign flags (#170363 )

2025-12-03 16:16:22 +00:00

runtime-loop-multiple-exits.ll

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

runtime-loop-non-exiting-latch.ll

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runtime-loop.ll

[LoopUnroll] Fix block frequencies for epilogue (#159163 )

2025-10-31 11:01:42 -04:00

runtime-multiexit-heuristic.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-small-upperbound.ll

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runtime-unroll-assume-no-remainder.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

runtime-unroll-reductions.ll

[LoopUnroll] Introduce parallel accumulators when unrolling FP reductions. (#166630 )

2025-11-27 15:03:36 +00:00

runtime-unroll-remainder.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

scev-dispositions-type-not-scevable.ll

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scev-forget-exit-phis.ll

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scev-invalidation-lcssa.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

scevunroll.ll

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

shifted-tripcount.ll

[LoopUnroll] Add CSE to remove redundant loads after unrolling. (#83860 )

2024-05-02 11:01:24 +01:00

tripcount-overflow.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

unloop.ll

[llvm] Remove br i1 undef from some regression tests [NFC] (#117112 )

2024-11-21 08:06:56 +00:00

unroll-after-peel.ll

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unroll-and-peel-last-iteration.ll

[LoopPeel] Handle non-local instructions/arguments when updating exiting values (#142993 )

2025-06-06 12:56:28 +08:00

unroll-cleanup.ll

Revert "[PGO] Add llvm.loop.estimated_trip_count metadata" (#151585 )

2025-07-31 15:56:31 -04:00

unroll-cleanuppad.ll

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unroll-cost-symbolic-execute.ll

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unroll-count.ll

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unroll-header-exiting-with-phis-multiple-exiting-blocks.ll

[IR] Optimize PHINode::removeIncomingValue() by swapping removed incoming value with the last incoming value. (#171963 )

2025-12-17 19:44:01 +08:00

unroll-header-exiting-with-phis.ll

[IndVars] Strengthen inference of samesign flags (#170363 )

2025-12-03 16:16:22 +00:00

unroll-heuristics-pgo.ll

[LoopUnroll] Fix block frequencies for epilogue (#159163 )

2025-10-31 11:01:42 -04:00

unroll-loads-cse.ll

[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549 )

2025-10-07 10:45:49 -04:00

unroll-loop-invalidation.ll

update_analyze_test_checks: support output from LAA (#67584 )

2023-10-31 14:33:53 +00:00

unroll-maxcount.ll

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unroll-opt-attribute.ll

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unroll-pragmas-disabled.ll

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unroll-pragmas.ll

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unroll-preserve-scev-lcssa.ll

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unroll-remove-redundant-dbg.ll

[RemoveDIs] Print IR with debug records by default (#91724 )

2024-06-14 15:07:27 +01:00

unroll-unconditional-latch.ll

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update-loop-info-in-subloops.ll

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verify-dominators.ll

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wrong_assert_in_peeling.ll

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zeroed-branch-weights.ll

[LoopUnroll] Fix assert fail on zeroed branch weights (#165938 )

2025-11-03 10:19:12 -05:00