[libc] Improve wcslcat and wcsncat implementation. good first issue https://github.com/llvm/llvm-project/contribute libc

#203649 opened Jun 12, 2026 by vonosmas

4

[llvm-exegesis] Add "did you mean ?" style hint for unknown instruction opcodes good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-exegesis

#203199 opened Jun 11, 2026 by RKSimon

4

Combine splice.right(splice.left(poison, x, offset), poison, offset) -> x good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#203027 opened Jun 10, 2026 by lukel97

3

bitreverse+bswap => bitreverse8 good first issue https://github.com/llvm/llvm-project/contribute llvm:vectorcombine Cost-based vector combine pass

#201756 opened Jun 5, 2026 by Validark

4

missed optimization of and + csel + sub good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#201328 opened Jun 3, 2026 by bcl5980

9

[AMDGPU][GlobalIsel] ICE: unable to lower arguments: void (i32) good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU llvm:globalisel crash Prefer [crash-on-valid] or [crash-on-invalid]

#200795 opened Jun 1, 2026 by mgcarrasco

18

[AMDGPU][GlobalIsel] ICE: cannot select G_PHI good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU llvm:globalisel confirmed Verified by a second party crash-on-valid

#200792 opened Jun 1, 2026 by mgcarrasco

13

[clang-tidy] Cert links are outdated documentation good first issue https://github.com/llvm/llvm-project/contribute clang-tidy confirmed Verified by a second party

#200277 opened May 28, 2026 by vbvictor

4

OCUDU benchmarks notably slower on clang22 than gcc16 on avx512 target good first issue https://github.com/llvm/llvm-project/contribute performance

#198106 opened May 16, 2026 by RKSimon

8

[X86] Missed Optimization: Vector 8-bit `rotl(x, 1)` should be lowered as `(x + x) - (x < 0)` good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization

#198059 opened May 16, 2026 by WalterKruger

12

llvm-objcopy crashes with unreachable error when (de)compression requested without selected value available good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-objcopy/strip

#197877 opened May 15, 2026 by jh7370

11

Check the ordering of the *at syscalls good first issue https://github.com/llvm/llvm-project/contribute libc

#195620 opened May 4, 2026 by kaladron

7

[AVX-512] `splat(u64 & 255) -| u64s_that_fit_in_bytes` should lower to `vpsubusb` good first issue https://github.com/llvm/llvm-project/contribute backend:X86 llvm:SelectionDAG SelectionDAGISel as well

#195462 opened May 2, 2026 by Validark

9

[libc][math] Add missing isnan variants for float16, bfloat16, and float128 good first issue https://github.com/llvm/llvm-project/contribute libc

#195400 opened May 2, 2026 by AnonMiraj

16

[AMDGPU][GlobalISel] Missing opcodes/intrinsics rules in AMDGPURegBankLegalize good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU llvm:globalisel

#192497 opened Apr 16, 2026 by vangthao95

24

[X86] computeKnownBitsForTargetNode - add X86ISD::GF2P8AFFINEQB handling good first issue https://github.com/llvm/llvm-project/contribute backend:X86

#190520 opened Apr 5, 2026 by RKSimon

13

[InstCombiner] foldIntrinsicIsFPClass - incorrect submasking of FPClassTest masks good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes floating-point Floating-point math

#189949 opened Apr 1, 2026 by RKSimon

15

[MIRSampleProfile] nullptr deref crash when profile sample use file not found good first issue https://github.com/llvm/llvm-project/contribute llvm:codegen crash-on-invalid PGO Profile Guided Optimizations

#189764 opened Mar 31, 2026 by nickdesaulniers

7

[DAG] computeKnownFPClass - add ISD::MAXNUM/MINNUM handling + test coverage good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#189694 opened Mar 31, 2026 by RKSimon

9

[clang-tidy] Add `readability-use-rethrow` check good first issue https://github.com/llvm/llvm-project/contribute clang-tidy check-request Request for a new check in clang-tidy

#189672 opened Mar 31, 2026 by unterumarmung

8

[DAG] computeKnownFPClass - add ISD::SQRT handling + test coverage good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#189583 opened Mar 31, 2026 by RKSimon

4

[DAG] computeKnownFPClass - add ISD::SINT_TO_FP/UINT_TO_FP handling good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#189479 opened Mar 30, 2026 by RKSimon

3

[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - add MMX/SSE/AVX/AVX512 VPSADBW intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:frontend Language frontend issues, e.g. anything involving "Sema" constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#188062 opened Mar 23, 2026 by RKSimon

8

-Wdangling-field detects view members initalized from a by-value owner parameter good first issue https://github.com/llvm/llvm-project/contribute clang:temporal-safety Issue/FR relating to the lifetime analysis in Clang (-Wdangling, -Wreturn-local-addr)

#187675 opened Mar 20, 2026 by hokein

8

performance optimization: special-case deduction for variables of type `auto` enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute c++11 clang:frontend Language frontend issues, e.g. anything involving "Sema" quality-of-implementation slow-compile

#186274 opened Mar 12, 2026 by zygoloid

9

[CIR] Upstream handling of AArch64 (Arm) Neon builtins good first issue https://github.com/llvm/llvm-project/contribute ClangIR Anything related to the ClangIR project

#185382 opened Mar 9, 2026 by banach-space

92

[clang] warn on operator in macro expansion whose operand doesn't lie entirely within the same macro expansion good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#184672 opened Mar 4, 2026 by zygoloid

4

[DAG] ISD::matchUnaryPredicate / matchUnaryFpPredicate / matchBinaryPredicate - add DemandedElts variant good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#181658 opened Feb 16, 2026 by RKSimon

4

[DAG] isKnownToBeAPowerOfTwo - add DemandedElts + OrZero handling to ISD::ZERO_EXTEND cases good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#181648 opened Feb 16, 2026 by RKSimon

7

Clang elides the wrong part of the template type in error message. good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema"

#180046 opened Feb 5, 2026 by ZequanWu

10

[clangd] crashes with a SIGSEGV when receiving a textDocument/didOpen request where the URI points to a directory instead of a file. good first issue https://github.com/llvm/llvm-project/contribute clangd crash Prefer [crash-on-valid] or [crash-on-invalid]

#177466 opened Jan 22, 2026 by mingodad

8

getNegatedExpression should handle FP16_TO_FP and FP_TO_FP16 good first issue https://github.com/llvm/llvm-project/contribute missed-optimization floating-point Floating-point math llvm:SelectionDAG SelectionDAGISel as well

#177448 opened Jan 22, 2026 by arsenm

11

[X86] SimplifyDemandedBitsForTargetNode - add X86ISD::BZHI handling good first issue https://github.com/llvm/llvm-project/contribute backend:X86

#177369 opened Jan 22, 2026 by RKSimon

5

Refactor `CodeGenFunction::EmitStoreThroughLValue` in `CGExpr.cpp` to consolidate HLSL-specific behavior into helper functions good first issue https://github.com/llvm/llvm-project/contribute clang:codegen IR generation bugs: mangling, exceptions, etc. HLSL HLSL Language Support

#176468 opened Jan 16, 2026 by Icohedron

6

[DAG] Add MVT:changeVectorElementCount and EVT::changeVectorElementCount good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#174584 opened Jan 6, 2026 by RKSimon

9

[ARM][AArch64] Remove CLS special handling and use generic ISD::CTLS node good first issue https://github.com/llvm/llvm-project/contribute backend:ARM backend:AArch64

#174337 opened Jan 4, 2026 by RKSimon

13

Improving performance of 2xi64 icmp slt/sgt/ult/ugt on SSE2 using 2xi64 sub good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization

#174214 opened Jan 2, 2026 by johnplatts

20

[InstCombine] SimplifyDemandedBits - add basic bitcast handling good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes

#173780 opened Dec 28, 2025 by RKSimon

12

~llvm.fsh[rl] patterns not recognized good first issue https://github.com/llvm/llvm-project/contribute llvm:optimizations llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#173132 opened Dec 20, 2025 by Validark

6

[ConstantFolding] Move `LibCallSimplifier::optimizeFdim` into ConstantFolding good first issue https://github.com/llvm/llvm-project/contribute code-cleanup floating-point Floating-point math constant-folding Problems related to constant folding in the optimizer

#171877 opened Dec 11, 2025 by dtcxzyw

3

[X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow SSE/AVX FP2INT conversion intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:frontend Language frontend issues, e.g. anything involving "Sema" clang:headers Headers provided by Clang, e.g. for intrinsics constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#169374 opened Nov 24, 2025 by RKSimon

10

[LLDB] Swig python extensions are missing test coverage good first issue https://github.com/llvm/llvm-project/contribute lldb test-suite

#168920 opened Nov 20, 2025 by Jlalond

14

[x86] Eliminate `movzx` when upper part of register is irrelevant or overwritten good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#168828 opened Nov 20, 2025 by Validark

16

[CIR] Implement missing X86 builtins good first issue https://github.com/llvm/llvm-project/contribute ClangIR Anything related to the ClangIR project

#167765 opened Nov 12, 2025 by andykaylor

91

[CIR] Upstream handling of X86 builtins good first issue https://github.com/llvm/llvm-project/contribute ClangIR Anything related to the ClangIR project

#167752 opened Nov 12, 2025 by andykaylor

28

[DAG] MatchLoadCombine - match swapped loads good first issue https://github.com/llvm/llvm-project/contribute missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#167314 opened Nov 10, 2025 by RKSimon

4

[clang-tidy] llvm-header-guard suggest invalid ifdef macros name good first issue https://github.com/llvm/llvm-project/contribute clang-tidy false-positive Warning fires when it should not

#166750 opened Nov 6, 2025 by vbvictor

10

[-Wunsafe-buffer-usage] Warn about two-arg string view constructors good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#166644 opened Nov 5, 2025 by tsepez

14

Missing changes for WG14 N3622 good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" c2y

#166623 opened Nov 5, 2025 by AaronBallman

6

[llvm] Document non-trivial `llvm::DenseMapBase` member functions enhancement Improving things as opposed to bug fixing, e.g. new or missing feature documentation good first issue https://github.com/llvm/llvm-project/contribute llvm:adt

#166155 opened Nov 3, 2025 by tbaederr

7

[AVX-512] Look for vector bit rotates on vectors larger than 16 bytes good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#165306 opened Oct 27, 2025 by Validark

6

auto allowed with a type in C++ good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" diverges-from:gcc Does the clang frontend diverge from gcc on this issue diverges-from:msvc Does the clang frontend diverge from msvc on this issue diverges-from:edg Does the clang frontend diverge from edg compiler on this issue

#164273 opened Oct 20, 2025 by shafik

10

[X86] Failure to fold or disjoint nodes into a AVX512 predicated add instruction good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization

#164161 opened Oct 19, 2025 by RKSimon

13

Complete VTable class name for types good first issue https://github.com/llvm/llvm-project/contribute ClangIR Anything related to the ClangIR project

#163601 opened Oct 15, 2025 by AmrDeveloper

24

[X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - add AVX512 integer comparison intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:headers Headers provided by Clang, e.g. for intrinsics constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#162054 opened Oct 6, 2025 by RKSimon

15

Implement `clz` using floating point math if `clz` instruction is not available good first issue https://github.com/llvm/llvm-project/contribute missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#161746 opened Oct 2, 2025 by Kmeakin

22

[DAG] Add computeKnownBits(FREEZE(X)) handling good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#161642 opened Oct 2, 2025 by RKSimon

4

[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX/AVX512 VNNI intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:headers Headers provided by Clang, e.g. for intrinsics constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#161340 opened Sep 30, 2025 by RKSimon

7

[x86][armv8] Failure to use flag in unsigned underflow compare idiom good first issue https://github.com/llvm/llvm-project/contribute missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#161036 opened Sep 28, 2025 by WalterKruger

14

[clang-format] Option to insert spaces before the closing `*/` enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-format

#160682 opened Sep 25, 2025 by parmi93

12

[Headers][X86] Allow AVX512 masked bitlogic intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:headers Headers provided by Clang, e.g. for intrinsics constexpr Anything related to constant evaluation

#160556 opened Sep 24, 2025 by RKSimon

7

[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow SSE/AVX/AVX512 square root intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:headers Headers provided by Clang, e.g. for intrinsics constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#160516 opened Sep 24, 2025 by RKSimon

13

[X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow SSE/AVX COMI/UCOMI/CMPS/CMPP fp comparison intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:headers Headers provided by Clang, e.g. for intrinsics constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#160473 opened Sep 24, 2025 by RKSimon

11

[clang] Bitcasts from vectors to integers not supported at compile time good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" constexpr Anything related to constant evaluation

#159905 opened Sep 20, 2025 by mahesh-attarde

14

guarded_by attributes not supported using c++11 style good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema"

#158116 opened Sep 11, 2025 by nickdesaulniers

10

[Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow SSE/AVX2 VMPSADBW intrinsics to be used in constexpr good first issue https://github.com/llvm/llvm-project/contribute backend:X86 clang:frontend Language frontend issues, e.g. anything involving "Sema" constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#157522 opened Sep 8, 2025 by RKSimon

10

[AVX-512] Look for masked `vpmovqb` opportunities on Zen 4+ good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#156883 opened Sep 4, 2025 by Validark

9

[CIR] Upstream missing tests from the ClangIR incubator good first issue https://github.com/llvm/llvm-project/contribute ClangIR Anything related to the ClangIR project

#156747 opened Sep 3, 2025 by andykaylor

25

[Clang] Allow __builtin_fma/fmaf/fmal to be used in a constant expression good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" constexpr Anything related to constant evaluation clang:bytecode Issues for the clang bytecode constexpr interpreter

#154747 opened Aug 21, 2025 by RKSimon

8

[X86] Recognise VPMADD52L/H patterns on AVX512IFMA/AVXIFMA targets good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization

#153787 opened Aug 15, 2025 by RKSimon

7

Wrong types checked at DAGCombiner::visitSRA(SDNode *N) good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#153543 opened Aug 14, 2025 by akiva-pripas

7

[GlobalISel] Port known-bit and known-sign-bits for all operations good first issue https://github.com/llvm/llvm-project/contribute llvm:globalisel

#150515 opened Jul 24, 2025 by davemgreen

22

[ARM] computeKnownBitsForTargetNode - add handling for ARMISD::VMOVIMM\VMVNIMM good first issue https://github.com/llvm/llvm-project/contribute backend:ARM

#149276 opened Jul 17, 2025 by RKSimon

10

#pragma init_seg(section-specifier, func-name) not supported good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" platform:windows extension:microsoft

#148938 opened Jul 15, 2025 by AdamGlass

7

Port JSON output format for llvm-dwarfdump good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-dwarfdump

#147850 opened Jul 9, 2025 by PiJoules

15

Zen3 scheduler model for the latency of VEXTRACTF128rri is probably incorrect good first issue https://github.com/llvm/llvm-project/contribute backend:X86 Scheduler Models Accuracy of X86 scheduler models

#146564 opened Jul 1, 2025 by TiborGY

8

Docs for [[clang::no_specializations]] attribute use "explicitly specialized" ambiguously documentation good first issue https://github.com/llvm/llvm-project/contribute clang Clang issues not falling into any other category

#143719 opened Jun 11, 2025 by jwakely

4

[X86] Failure to reduce extended i64 add/sub/mul arithmetic to i32 with known zeros in the upper 32-bits good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization

#142308 opened Jun 1, 2025 by RKSimon

13

[Clang] Explain satisfaction failure for more type traits good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#141911 opened May 29, 2025 by cor3ntin

20

`[[gnu::weak]]` disables constant evaluation of constexpr variables in C++14 good first issue https://github.com/llvm/llvm-project/contribute c++11 c++14 clang:frontend Language frontend issues, e.g. anything involving "Sema" diverges-from:gcc Does the clang frontend diverge from gcc on this issue

#141797 opened May 28, 2025 by cor3ntin

12

Missed optimization: (%1 <= ~%0) && (%0 > ~%1) ==> false good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#141479 opened May 26, 2025 by AAAA-I

7

Missed Optimization: max(max(x, c1) << c2, c3) —> max(x << c2, c3) when c3 >= c1 * 2 ^ c2 good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#139786 opened May 13, 2025 by Cancelll

11

Doxygen links to wrong implementation file documentation good first issue https://github.com/llvm/llvm-project/contribute

#139512 opened May 12, 2025 by amcn

5

[OpenMP] Assertion `llvm::isUIntN(BitWidth, val) && "Value is not an N-bit unsigned value"' failed. good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash Prefer [crash-on-valid] or [crash-on-invalid] clang:openmp OpenMP related changes to Clang

#139268 opened May 9, 2025 by k-arrows

9

[CodeGen] llc silently ignores -{start|stop}-{after|before} options good first issue https://github.com/llvm/llvm-project/contribute llvm:codegen

#138831 opened May 7, 2025 by optimisan

8

Funnel shift in 64-bit doesn't get matched to an intrinsic good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes

#138334 opened May 2, 2025 by mike-goutokuji

9

[NVPTX] Test SM Versions via `ptxas` good first issue https://github.com/llvm/llvm-project/contribute backend:NVPTX

#137028 opened Apr 23, 2025 by justinfargnoli

7

Specific structure name can cause shadowing of globally defined lambda, causing "struct::operator()" to be called instead of "lambda::operator()" good first issue https://github.com/llvm/llvm-project/contribute c++ clang:frontend Language frontend issues, e.g. anything involving "Sema" lambda C++11 lambda expressions

#134049 opened Apr 2, 2025 by jjkazana

24

MetaRenamer command line options should be replaced with pass parameters good first issue https://github.com/llvm/llvm-project/contribute llvm:transforms

#133875 opened Apr 1, 2025 by arsenm

4

[libc] Clean up copt naming good first issue https://github.com/llvm/llvm-project/contribute libc

#133505 opened Mar 28, 2025 by michaelrj-google

6

[clang++] operator==(vector of long, vector of long) -> vector of long long good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" ABI Application Binary Interface diverges-from:gcc Does the clang frontend diverge from gcc on this issue

#132604 opened Mar 23, 2025 by ImpleLee

22

AMDGPU GlobalISel fails on select of G_UBSANTRAP good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU llvm:globalisel

#131740 opened Mar 18, 2025 by arsenm

5

AMDGPU should handle SimplifyDemandedVectorElts for more trivial intrinsics good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU missed-optimization

#131734 opened Mar 18, 2025 by arsenm

9

Auto-vectorize saturating addition good first issue https://github.com/llvm/llvm-project/contribute missed-optimization llvm:transforms

#131601 opened Mar 17, 2025 by Validark

10

Failure to recognise unnecessary sext for add+cmp good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#130088 opened Mar 6, 2025 by RKSimon

23

Improve `llvm.ucmp.iN.i1` codegen (specifically the 1-bit inputs case) good first issue https://github.com/llvm/llvm-project/contribute missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#129401 opened Mar 1, 2025 by scottmcm

10

Implement fixed point fxdivi functions in llvm-libc good first issue https://github.com/llvm/llvm-project/contribute libc

#129126 opened Feb 27, 2025 by PiJoules

18

Implement fixed point divifx functions in llvm-libc good first issue https://github.com/llvm/llvm-project/contribute libc

#129124 opened Feb 27, 2025 by PiJoules

11

Implement fixed point mulifx functions in llvm-libc good first issue https://github.com/llvm/llvm-project/contribute libc

#129123 opened Feb 27, 2025 by PiJoules

11

AMDGPU is missing simplify demanded bits optimizations of readfirstlane and similar operations good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU missed-optimization

#128390 opened Feb 23, 2025 by arsenm

17

GlobalISel should have G_POISON good first issue https://github.com/llvm/llvm-project/contribute llvm:globalisel

#127486 opened Feb 17, 2025 by arsenm

6

AMDGPU: can optimize away v_readfirstlane_b32 on implicit_def input good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU missed-optimization

#125950 opened Feb 5, 2025 by rampitec

8

[llvm-mca][FeatureRequest] In timeline graph, note source of delay for each instruction enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-mca

#123756 opened Jan 21, 2025 by ibogosavljevic

18

Audit/Update `select` uses in DiagnosticXKinds.td to use `enum_select`. good first issue https://github.com/llvm/llvm-project/contribute quality-of-implementation clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#123121 opened Jan 15, 2025 by erichkeane

9

Add a `--verbose` option for `llvm-strip` enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-objcopy/strip

#123041 opened Jan 15, 2025 by fxmarty-amd

13

missing parenthesis for function-like macro invocation could have better diagnostic good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#123038 opened Jan 15, 2025 by zmodem

4

llvm/lib/CodeGen/LiveRangeUtils.h:40: Iterators applied to wrong data structure ? good first issue https://github.com/llvm/llvm-project/contribute llvm:codegen code-quality

#122937 opened Jan 14, 2025 by dcb314

8

Take advantage of `assume`s on `x * x` (with `nuw`) good first issue https://github.com/llvm/llvm-project/contribute llvm:optimizations missed-optimization

#122412 opened Jan 10, 2025 by scottmcm

9

[AArch64] Correct scheduling information for flag manipulation instructions in Neoverse-V2 good first issue https://github.com/llvm/llvm-project/contribute backend:AArch64

#122124 opened Jan 8, 2025 by Asher8118

6

[libc][docs][POSIX] flush out documentation for the POSIX defined headers documentation good first issue https://github.com/llvm/llvm-project/contribute libc

#122006 opened Jan 7, 2025 by nickdesaulniers

27

Stack-overflow as a result of stack exhaustion in function `assign()` good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" compiler-rt:asan Address sanitizer crash-on-invalid generated by fuzzer

#121952 opened Jan 7, 2025 by skorpion98

10

[clang] Poor diagnostic with wrong template argument type enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer confirmed Verified by a second party

#121235 opened Dec 27, 2024 by antoniofrighetto

7

[Clang][Driver][Test] No negative tests for unsupported options in different drivers good first issue https://github.com/llvm/llvm-project/contribute test-suite clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl'

#119190 opened Dec 9, 2024 by Maetveis

7

[AArch64][GlobalISel] ABD operations and combines good first issue https://github.com/llvm/llvm-project/contribute backend:AArch64 llvm:globalisel missed-optimization

#118085 opened Nov 29, 2024 by davemgreen

17

move `AST_MATCHER(VarDecl, isLocal) { return Node.isLocalVarDecl(); }` to ast-matcher good first issue https://github.com/llvm/llvm-project/contribute clang-tidy

#117431 opened Nov 23, 2024 by HerrCai0907

9

[NVPTX] Port code to `llvm/lib/CodeGen/SelectionDAG/*` good first issue https://github.com/llvm/llvm-project/contribute backend:NVPTX llvm:SelectionDAG SelectionDAGISel as well

#116695 opened Nov 18, 2024 by justinfargnoli

8

[MLIR][affine] Proper handling of vector load / stores in Affine dialect and transformations good first issue https://github.com/llvm/llvm-project/contribute mlir:affine

#115989 opened Nov 13, 2024 by dragondracarys007

11

[MLIR][affine] Illegal affine loop fusion with vector types good first issue https://github.com/llvm/llvm-project/contribute mlir:affine

#115849 opened Nov 12, 2024 by dragondracarys007

13

Are the tutorials up-to-date? (Clang version is 20.0.0git) documentation good first issue https://github.com/llvm/llvm-project/contribute clang Clang issues not falling into any other category

#114711 opened Nov 3, 2024 by bobhairgrove

12

[NVPTX] Implement `TLI.isTruncateFree(EVT, EVT)` and `TLI.isZExtFree()` good first issue https://github.com/llvm/llvm-project/contribute backend:NVPTX

#114339 opened Oct 31, 2024 by justinfargnoli

11

[mlir][Vector] Improve support for 0-d vectors in vector dialect lowerings good first issue https://github.com/llvm/llvm-project/contribute mlir:vector

#112913 opened Oct 18, 2024 by Groverkss

6

[clang] Assertion `(!needsOverloadResolutionForCopyConstructor() || (data().DeclaredSpecialMembers & SMF_CopyConstructor)) && "this property has not yet been computed by Sema"' failed. good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" crash-on-invalid confirmed Verified by a second party generated by fuzzer

#112909 opened Oct 18, 2024 by yijan4845

8

scalbln(x, n), scalbn(x, n), ldexp(x, n) are not folded at the compilation time when (x, n) is constant good first issue https://github.com/llvm/llvm-project/contribute llvm:optimizations missed-optimization floating-point Floating-point math

#112631 opened Oct 16, 2024 by k-arrows

8

AMDGPU should implement TargetLowering::hasAndNot good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU

#112550 opened Oct 16, 2024 by arsenm

17

[DAG][X86] Use shrdq to insert into a bitfield good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization

#112488 opened Oct 16, 2024 by kazutakahirata

15

AMDGPU should implement IR version of isFMAFasterThanFMulAndFAdd good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU missed-optimization

#108751 opened Sep 15, 2024 by arsenm

12

[feature][riscv] handle target address calculation in llvm-objdump disassembly for riscv good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-objdump

#108469 opened Sep 12, 2024 by PiJoules

8

Unnecessary return statement in unreachable block generated by EmitFunctionEpilog in musttail cases. good first issue https://github.com/llvm/llvm-project/contribute clang:codegen IR generation bugs: mangling, exceptions, etc.

#104770 opened Aug 19, 2024 by kiran-isaac

6

[mlir] Auto generate docs for dialect op interfaces good first issue https://github.com/llvm/llvm-project/contribute mlir:core MLIR Core Infrastructure

#104593 opened Aug 16, 2024 by tomnatan30

9

[clang-analyzer-security.insecureAPI.strcpy] extend list of unsafe functions good first issue https://github.com/llvm/llvm-project/contribute clang:static analyzer

#103038 opened Aug 13, 2024 by ingo-loehken

16

[Clang] Suggest more test cases on issue 79748 good first issue https://github.com/llvm/llvm-project/contribute test-suite clang:frontend Language frontend issues, e.g. anything involving "Sema"

#102422 opened Aug 8, 2024 by lyazj

7

[clang] [C++20] Defaulted `operator==` doesn't lookup in using-directive properly good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema"

#97087 opened Jun 28, 2024 by MitalAshok

11

Optimize `decltype(T{})` to `T` in compiler error messages good first issue https://github.com/llvm/llvm-project/contribute quality-of-implementation clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#96638 opened Jun 25, 2024 by mpusz

11

[mlir][transform] ApplyToEachResultList does not define STL convenience methods good first issue https://github.com/llvm/llvm-project/contribute mlir:transform_dialect

#94968 opened Jun 10, 2024 by Groverkss

5

Addressing `-Wimplicit-float-conversion` warning might lead to precision loss enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#93288 opened May 24, 2024 by firewave

18

[InstCombine] Failure to factorize `add`/`sub` and `max`/`min` using distributivity good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#92433 opened May 16, 2024 by Kmeakin

10

[clang] Deduplicate `FinishTemplateArgumentDeduction` helper function in `SemaTemplateDeduction.cpp`. good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema"

#92224 opened May 15, 2024 by hokein

13

[clang][C++] Bad error recovery when classes are defined inside template aliases good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" crash-on-invalid

#91564 opened May 9, 2024 by mizvekov

13

SelectionDAG store merging default implementations are unreasonable good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#90714 opened May 1, 2024 by arsenm

12

[BOLT] Evaluate and speedup discoverFileObjects help wanted Indicates that a maintainer wants help. Not [good first issue]. good first issue https://github.com/llvm/llvm-project/contribute BOLT

#90661 opened Apr 30, 2024 by aaupov

14

Decomposition Declaration diagnostic for missing initializer is pretty unclear good first issue https://github.com/llvm/llvm-project/contribute quality-of-implementation clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#90107 opened Apr 25, 2024 by erichkeane

9

[AMDGPU] generates v_cndmask/lshlrev for uniform select between 0 and a power of 2 good first issue https://github.com/llvm/llvm-project/contribute backend:AMDGPU

#87938 opened Apr 7, 2024 by Engininja2

21

[AArch64] Add SimplifyDemandedVectorEltsForTargetNode support for AArch64ISD::DUPLANE nodes good first issue https://github.com/llvm/llvm-project/contribute backend:AArch64

#87497 opened Apr 3, 2024 by RKSimon

13

[InstCombine] Missed optimization : fold `switch(rol(a, c))` good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#86161 opened Mar 21, 2024 by XChy

9

missed fold, sext(fptosi x to i32) => fptosi x to i64 good first issue https://github.com/llvm/llvm-project/contribute llvm:codegen missed-optimization floating-point Floating-point math

#85268 opened Mar 14, 2024 by zhengyang92

13

missed fold: (X * 0.0) * constant => X * 0.0 good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization floating-point Floating-point math

#85241 opened Mar 14, 2024 by zhengyang92

36

[DAG] SDPatternMatch - add m_BinOp/m_c_BinOp variants driven by TLI.isBinOp/isCommutativeBinOp good first issue https://github.com/llvm/llvm-project/contribute llvm:SelectionDAG SelectionDAGISel as well

#84940 opened Mar 12, 2024 by RKSimon

13

Missed Optimization: Aligned Pointer Optimizations Can't Happen With Prefered OR Instead of ADD good first issue https://github.com/llvm/llvm-project/contribute llvm:optimizations missed-optimization

#84401 opened Mar 7, 2024 by Geotale

8

[Support] Investigate making KnownBits saturated add/sub implementations optimal good first issue https://github.com/llvm/llvm-project/contribute llvm:support

#84213 opened Mar 6, 2024 by RKSimon

8

[InstCombine] Missed optimization: fail to fold `(A >> C1) Pred C2` if `shr` is used multiple times good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#83430 opened Feb 29, 2024 by XChy

8

[OpenMP] Metadirective uses default for non-const user condition good first issue https://github.com/llvm/llvm-project/contribute openmp clang:openmp OpenMP related changes to Clang

#82754 opened Feb 23, 2024 by Thyre

11

`std::filesystem::canonical("")` should throw good first issue https://github.com/llvm/llvm-project/contribute libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. filesystem C++17 std::filesystem

#77170 opened Jan 6, 2024 by Pesa

7

Implement `insertVar` having `Identifier` parameter enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute mlir:presburger

#76839 opened Jan 3, 2024 by iambrj

6

basic properties of floor and ceiling function good first issue https://github.com/llvm/llvm-project/contribute llvm:optimizations missed-optimization floating-point Floating-point math

#76438 opened Dec 27, 2023 by k-arrows

12

hasAnyArgument() spuriously ignores match good first issue https://github.com/llvm/llvm-project/contribute clang-query clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party

#75754 opened Dec 17, 2023 by xb8g2pw0

18

`bugprone-dangling-handle.HandleClasses` should update its defaults enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-tidy

#75685 opened Dec 16, 2023 by cjdb

6

Simplify initialisation diagnostic when types are cv-qualified good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#73399 opened Nov 25, 2023 by cjdb

5

Loading/storing an 8 aligned i128 uses two `movq` instead of a single `movups` good first issue https://github.com/llvm/llvm-project/contribute backend:X86 missed-optimization llvm:SelectionDAG SelectionDAGISel as well

#72640 opened Nov 17, 2023 by LingMan

8

[clang] Avoid printing overly large integer/_BitInt numbers in static assertion failure diagnostics good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer confirmed Verified by a second party

#71675 opened Nov 8, 2023 by tbaederr

16

[clang-tidy] New check for static_cast of an enum class type good first issue https://github.com/llvm/llvm-project/contribute clang-tidy check-request Request for a new check in clang-tidy

#71543 opened Nov 7, 2023 by FalcoGer

13

[clang] --entry command line option is broken good first issue https://github.com/llvm/llvm-project/contribute clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl'

#68355 opened Oct 5, 2023 by s-barannikov

16

clang-include-cleaner - replaces chrono with bits/chrono help wanted Indicates that a maintainer wants help. Not [good first issue]. good first issue https://github.com/llvm/llvm-project/contribute clang-include-cleaner

#68213 opened Oct 4, 2023 by PiotrZSL

12

Source range of deleted or defaulted function outside class body is inaccurate good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema"

#64805 opened Aug 18, 2023 by smcpeak

22

Enable exp10 libcall recognition on linux good first issue https://github.com/llvm/llvm-project/contribute llvm:codegen llvm:optimizations platform:linux floating-point Floating-point math

#64677 opened Aug 14, 2023 by arsenm

7

clang-tidy: fully qualify names from a given namespace (e.g. clean up `using namespace std;`) good first issue https://github.com/llvm/llvm-project/contribute clang-tidy check-request Request for a new check in clang-tidy

#64441 opened Aug 4, 2023 by PhilMiller

13

[OpenMP] clang crashed when openmp's collapse clause argument is unknown good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] clang:openmp OpenMP related changes to Clang

#63581 opened Jun 28, 2023 by fel-cab

7

orc::InProcessMemoryMapper makes too many memory mappings good first issue https://github.com/llvm/llvm-project/contribute orcjit julialang

#63236 opened Jun 10, 2023 by gbaraldi

16

llvm-symbolizer --markup-filter does not adjust addresses without debug info good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-symbolizer

#63178 opened Jun 7, 2023 by mysterymath

10

[clang][ExtractAPI] Declaration fragments should show types as shown in the source code. good first issue https://github.com/llvm/llvm-project/contribute clang:tooling LibTooling

#61157 opened Mar 3, 2023 by daniel-grumberg

15

a missing `type` field in `DISubprogram` does not give a warning but a Segmentation fault good first issue https://github.com/llvm/llvm-project/contribute debuginfo crash Prefer [crash-on-valid] or [crash-on-invalid]

#59471 opened Dec 12, 2022 by amtoine

21

Feature Request: Add clang-format setting to disable "*" being added when ReflowComments is used with /* */ comments good first issue https://github.com/llvm/llvm-project/contribute clang-format

#58710 opened Oct 31, 2022 by sean-mcmanus

16

Unrelated errors introduce additional runtime diagnostics by skipping CFG construction good first issue https://github.com/llvm/llvm-project/contribute clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#58276 opened Oct 10, 2022 by rnk

10

Suboptimal instruction sequence when operands are reordered good first issue https://github.com/llvm/llvm-project/contribute llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes missed-optimization

#57255 opened Aug 19, 2022 by hiraditya

27

clang-tidy: readability-implicit-bool-conversion not working with std::optional good first issue https://github.com/llvm/llvm-project/contribute clang-tidy

#56009 opened Jun 13, 2022 by Amaroker

18

Check for `__unw_add_dynamic_eh_frame_section` in non-ORC-runtime exception registration paths. good first issue https://github.com/llvm/llvm-project/contribute orcjit

#55681 opened May 24, 2022 by lhames

4

Move JITLink from StringRefs to SymbolStringPtrs good first issue https://github.com/llvm/llvm-project/contribute orcjit jitlink

#55533 opened May 17, 2022 by weliveindetail

11

clang-tidy check readability-container-data-pointer fix isn't configurable to use std::string::c_str() instead of data() enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-tidy

#55026 opened Apr 21, 2022 by sean-mcmanus

12

Add equivalent of LambdaBodyIndentation for ObjC blocks good first issue https://github.com/llvm/llvm-project/contribute clang-format objective-c

#53740 opened Feb 11, 2022 by jrose-signal

6

Aligning consecutive assignments in enum blocks only enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-format

#52983 opened Jan 4, 2022 by Julien-Elie

13

JavaScriptWrapImports:false doesn't work with ColumnLimit:0 good first issue https://github.com/llvm/llvm-project/contribute clang-format javascript

#52935 opened Dec 30, 2021 by stasm

6

[X86][SSE] Improve ISD::FP_TO_*INT_SAT vector lowering good first issue https://github.com/llvm/llvm-project/contribute backend:X86 bugzilla Issues migrated from bugzilla

#51923 opened Nov 22, 2021 by RKSimon

7

[Clang] Support elementwise/reduction builtins in constexpr contexts. good first issue https://github.com/llvm/llvm-project/contribute c clang:frontend Language frontend issues, e.g. anything involving "Sema" bugzilla Issues migrated from bugzilla c++26 extension:clang constexpr Anything related to constant evaluation

#51787 opened Nov 9, 2021 by fhahn

18

Implement non-unit stride dense vectorization (difficult starter) good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla mlir:llvm mlir:sparsetensor Sparse compiler in MLIR

#51660 opened Oct 26, 2021 by aartbik

4

Implement more Python DSL-based "exhaustive" sparse kernel generators (easy starter) good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla mlir:llvm mlir:sparsetensor Sparse compiler in MLIR

#51657 opened Oct 26, 2021 by aartbik

7

Implement strategy for loop ordering choice (true compiler starter) good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla mlir:tensor

#51651 opened Oct 25, 2021 by aartbik

10

Implement sparse kernel benchmarks (moderate level, independent, starter) good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla mlir:llvm mlir:sparsetensor Sparse compiler in MLIR confirmed Verified by a second party

#51650 opened Oct 25, 2021 by aartbik

7

Enhance our tests for sparse kernels (medium level, independent, starter) good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla mlir:llvm mlir:sparsetensor Sparse compiler in MLIR

#51649 opened Oct 25, 2021 by aartbik

5

Improve the messages output by unsupported options when using --elf-output-style=GNU good first issue https://github.com/llvm/llvm-project/contribute tools:llvm-readobj/readelf bugzilla Issues migrated from bugzilla

#51294 opened Sep 24, 2021 by gbreynoo

6

Trivial memset optimization not applied to loops under -Oz (LoopIdiomRecognize) good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla llvm:optimizations missed-optimization llvm:codesize Code size issues

#50308 opened Jul 2, 2021 by jeffy1009 mannequin

31

Finish / clean up MapFile implementation good first issue https://github.com/llvm/llvm-project/contribute lld bugzilla Issues migrated from bugzilla lld:MachO

#50033 opened Jun 12, 2021 by int3

12

Missing FP optimization opportunities for fcmp ord operations good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla llvm:optimizations missed-optimization floating-point Floating-point math

#49175 opened Apr 4, 2021 by aqjune

4

We should probably warn at how 'static inline' variables are odd at namespace scope. good first issue https://github.com/llvm/llvm-project/contribute c++17 bugzilla Issues migrated from bugzilla clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer confirmed Verified by a second party

#48977 opened Mar 18, 2021 by erichkeane

10

"this requires expression will only be checked for syntactic validity" suggests bad fixit, is not emitted on equally dangerous code good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla concepts C++20 concepts clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#47285 opened Oct 22, 2020 by Quuxplusone

7

Incorrect generation of HTML reports good first issue https://github.com/llvm/llvm-project/contribute clang:static analyzer bugzilla Issues migrated from bugzilla

#46089 opened Jul 16, 2020 by llvmbot

8

Create a check that warns about using %p printf specifier enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang:static analyzer bugzilla Issues migrated from bugzilla

#43453 opened Nov 21, 2019 by LegalizeAdulthood

11

recognize aligned case statements enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-format bugzilla Issues migrated from bugzilla

#42113 opened Jul 25, 2019 by janwilmans mannequin

5

add newline between include and namespace enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-format bugzilla Issues migrated from bugzilla

#42112 opened Jul 25, 2019 by janwilmans mannequin

6

Create bugprone-printf-array check good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla check-request Request for a new check in clang-tidy

#40511 opened Mar 21, 2019 by LegalizeAdulthood

9

c11: Accepts ill-formed program with inline function definition containing modifiable variable with static storage duration. good first issue https://github.com/llvm/llvm-project/contribute c bugzilla Issues migrated from bugzilla clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer confirmed Verified by a second party

#39524 opened Dec 28, 2018 by yeah-boi mannequin

4

[X86][AVX] Prefer per-element vector shifts for known splats good first issue https://github.com/llvm/llvm-project/contribute backend:X86 bugzilla Issues migrated from bugzilla

#39424 opened Dec 18, 2018 by RKSimon

8

DWARF parser: <DW_OP_piece for offset 4 but top of stack is of size 8> good first issue https://github.com/llvm/llvm-project/contribute lldb bugzilla Issues migrated from bugzilla wrong-debug

#39145 opened Nov 27, 2018 by llvmbot

6

SortIncludes should support "@import" lines in Objective-C enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-format bugzilla Issues migrated from bugzilla objective-c

#38995 opened Nov 13, 2018 by llvmbot

4

[X86] Add ComputeKnownBits support for BEXTR good first issue https://github.com/llvm/llvm-project/contribute backend:X86 bugzilla Issues migrated from bugzilla llvm:analysis Includes value tracking, cost tables and constant folding

#38501 opened Oct 2, 2018 by RKSimon

6

bugprone check for delete this good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla check-request Request for a new check in clang-tidy

#38089 opened Aug 28, 2018 by EugeneZelenko

6

Macros on access specifiers not formatted correctly enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-format bugzilla Issues migrated from bugzilla

#37751 opened Aug 1, 2018 by steveire

5

[meta] [debugify] fix -check-debugify failures metaissue Issue to collect references to a group of similar or related issues. good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla debuginfo

#37301 opened Jun 27, 2018 by gregbedwell

28

[X86] Add support for X86ISD float2int constant folding good first issue https://github.com/llvm/llvm-project/contribute backend:X86 bugzilla Issues migrated from bugzilla

#37146 opened Jun 14, 2018 by RKSimon

7

Add option to readability-implicit-bool-conversion check to allow implicit conversion *to bool* enhancement Improving things as opposed to bug fixing, e.g. new or missing feature good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla

#36323 opened Apr 2, 2018 by llvmbot

4

modernize-use-digit-separator good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla check-request Request for a new check in clang-tidy

#35414 opened Jan 23, 2018 by LegalizeAdulthood

15

include/clang/Tooling/Refactoring/Rename/RenamingAction.h:79]: (performance) good first issue https://github.com/llvm/llvm-project/contribute clang:tooling LibTooling bugzilla Issues migrated from bugzilla confirmed Verified by a second party

#34652 opened Nov 14, 2017 by llvmbot

6

readability check to convert numerical constants to std::numeric_limits good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla confirmed Verified by a second party check-request Request for a new check in clang-tidy

#34434 opened Oct 25, 2017 by EugeneZelenko

14

Improve bitfield arithmetic good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla llvm:codegen confirmed Verified by a second party llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes

#33874 opened Sep 8, 2017 by RKSimon

12

[DWARF] Line 0 should not have is_stmt set good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla llvm:codegen debuginfo

#33870 opened Sep 7, 2017 by pogo59

6

Improve -Wparentheses for arbitrary bool contexts good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

#33528 opened Aug 14, 2017 by silvasean

14

[X86][SSE] Recognise v2i64 comparison patterns good first issue https://github.com/llvm/llvm-project/contribute backend:X86 bugzilla Issues migrated from bugzilla confirmed Verified by a second party llvm:instcombine Covers the InstCombine, InstSimplify and AggressiveInstCombine passes

#32961 opened Jun 27, 2017 by RKSimon

9

Readability check for position of constant operand in binary operators good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla check-request Request for a new check in clang-tidy

#31860 opened Apr 3, 2017 by EugeneZelenko

13

[X86] update_llc_test_checks.py fails on win32 triples good first issue https://github.com/llvm/llvm-project/contribute llvm-tools All llvm tools that do not have corresponding tag bugzilla Issues migrated from bugzilla

#31744 opened Mar 23, 2017 by RKSimon

13

Unnecessary vector type produces wrong ll parser error good first issue https://github.com/llvm/llvm-project/contribute bugzilla Issues migrated from bugzilla llvm:core

#29043 opened Jul 22, 2016 by arsenm

5

clang crashes on x86_64-linux-gnu with Assertion `power <= maxExponent' failed good first issue https://github.com/llvm/llvm-project/contribute clang:frontend Language frontend issues, e.g. anything involving "Sema" bugzilla Issues migrated from bugzilla crash-on-invalid confirmed Verified by a second party

#28406 opened Jun 7, 2016 by llvmbot

9

Replace /* ... */ single-line comments with // ... comments good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla check-request Request for a new check in clang-tidy

#24841 opened Aug 15, 2015 by LegalizeAdulthood

12

Replace memcpy with std::copy good first issue https://github.com/llvm/llvm-project/contribute clang-tidy bugzilla Issues migrated from bugzilla awaiting-review Has pending Phabricator review check-request Request for a new check in clang-tidy

#22583 opened Jan 12, 2015 by LegalizeAdulthood

14

Can not use C99 function names as variable names in C89 good first issue https://github.com/llvm/llvm-project/contribute c clang:frontend Language frontend issues, e.g. anything involving "Sema" bugzilla Issues migrated from bugzilla rejects-valid confirmed Verified by a second party

#15522 opened Feb 4, 2013 by llvmbot

11

[Attributor] Make use of analysis in the MustBeExecutedExplorer help wanted Indicates that a maintainer wants help. Not [good first issue]. gsoc Google Summer of Code good first issue https://github.com/llvm/llvm-project/contribute llvm::Attributor

#175 opened Mar 13, 2020 by jdoerfert

3

Calling convention differs from MSVC for member functions returning SIMD types good first issue https://github.com/llvm/llvm-project/contribute backend:X86 ABI Application Binary Interface platform:windows extension:microsoft

#104 opened Jan 22, 2020 by lhallam

8