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Issues list

Clang/Clang++ 20.1.5 major performance regression comparing to 20.1.4 build-problem cmake Build system in general and CMake in particular regression
#140386 opened May 17, 2025 by T-Maxxx
Missing loop vectorization due to optimization in InstrCombine regression vectorizers
#139050 opened May 8, 2025 by thevar1able
placement new 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] regression
#136518 opened Apr 20, 2025 by ordinary-github-user
3
[X86][AVX2] X86FixupVectorConstantsPass - performance regression backend:X86 performance regression
#135998 opened Apr 16, 2025 by nurmukhametov
1
@RKSimon
8
Clang ICE on specialized template taking a member function pointer clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-invalid regression
#130727 opened Mar 11, 2025 by tambry
@mizvekov
3
[AArch64] auto-vectorizer regression backend:AArch64 regression
#127134 opened Feb 13, 2025 by appujee
5
[SLP] Polyhedron/fatigue2 16% slowdown after 88e7b8b backend:X86 llvm:SLPVectorizer performance regression
#126330 opened Feb 8, 2025 by vzakhari
@RKSimon @alexey-bataev
6
Regression in Fedora pybind11 package caused by 7954a0514ba7de40dba6c598af830fd1b7a8bf0c regression
#119507 opened Dec 11, 2024 by tstellar
@fhahn
6
[flang] Fortran/gfortran/regression/entry_23.f crashes on several non-x86 platforms flang Flang issues not falling into any other category regression
#119418 opened Dec 10, 2024 by tarunprabhu
1
regression: clang -Wunused-parameter stopped warning for unused params in Objective-C methods at some point clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer objective-c regression
#117931 opened Nov 27, 2024 by seanm
[Clang] ICE on void{} clang:codegen IR generation bugs: mangling, exceptions, etc. confirmed Verified by a second party crash Prefer [crash-on-valid] or [crash-on-invalid] regression
#116440 opened Nov 15, 2024 by MagentaTreehouse
3
[clang] Assertion `CachedLexPos != 0' failed. clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-invalid regression regression:20 Regression in 20 release
#114815 opened Nov 4, 2024 by yijan4845
4
Clang-20 Crash: TemplateArgument kind is not expected for NTTP UNREACHABLE executed at /root/llvm-project/clang/lib/AST/ASTDiagnostic.cpp:1245! 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] regression
#114758 opened Nov 4, 2024 by iamanonymouscs
4
[regression] trunk emits more mov than llvm-18 at -Oz backend:X86 regression
#111081 opened Oct 4, 2024 by dcci
6
[clang] Crash on initialization clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-invalid regression regression:16 Regression in 16 release
#106180 opened Aug 27, 2024 by cardigan1008
2
[X86] LLVM >= 18 folding bitcast -> and -> bitcast to @llvm.fabs.f16 generates call to __extendhfsf2 backend:X86 llvm:SelectionDAG SelectionDAGISel as well regression
#104915 opened Aug 20, 2024 by overmighty
2
5
call to __attribute_((__error__(...))) not eliminated with -fprofile-instr-generate after commit 56af0e913ce7 llvm:optimizations regression
#103479 opened Aug 13, 2024 by nathanchance
1
[InstCombine] Performance degradation caused by more branch after commit b5a9361 and #66740 llvm:SelectionDAG SelectionDAGISel as well regression
#99835 opened Jul 22, 2024 by cyyself
5
[AMDGPU]Add+GEP->GEP commit performance degradation on AMDGPU backend:AMDGPU regression
#94092 opened Jun 1, 2024 by lfmeadow
@bcahoon
13
clang-cl 18 generates DWARF debug info section with -Z7 when compiling a .s file. debuginfo regression
#92229 opened May 15, 2024 by glandium
1
Regression on trunk: missed optimization for dead code, work as expected on clang-18 llvm:optimizations regression
#91431 opened May 8, 2024 by ZY546
@Backl1ght
2
[clang-format] Macro A=; causes -> to be incorrectly inferred as trailing return type clang-format regression
#90227 opened Apr 26, 2024 by yous
4
[clang/c++] Very strange/bad optimizer behavior. llvm:optimizations regression
#89699 opened Apr 23, 2024 by no-more-secrets
3
Crash when evaluating a constexpr static function template in an incomplete class context. 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] regression
#87971 opened Apr 8, 2024 by cor3ntin
2
function with error attribute not eliminated after commit 3589cacfa8da8 llvm:analysis regression
#85647 opened Mar 18, 2024 by nathanchance
@dtcxzyw
10
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