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<code>std::optional&lt;T&gt;::transform</code> does not support user specializations

new issue

Status: Open.

#172197 In llvm/llvm-project;

· howtonotwin opened on Dec 14, 2025

Clang crashes on valid code when compiling with profiled data using PGO

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

vectorizers

Status: Open.

Bug

#172195 In llvm/llvm-project;

· helloqirun opened on Dec 14, 2025

[missed-opt] Naive per-bit loop not optimized to popcnt

llvm:optimizations

missed-optimization

Status: Open.

#172193 In llvm/llvm-project;

· purplesyringa opened on Dec 14, 2025

[clang][bytecode] Assertion `!ItemTypes.empty()' failed.

clang:bytecodeIssues for the clang bytecode constexpr interpreterIssues for the clang bytecode constexpr interpreter

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

Status: Open.

Bug

#172191 In llvm/llvm-project;

· k-arrows opened on Dec 14, 2025

[Clang] <code>[[clang::objc_direct]]</code> causes an ICE when used on a method in a category

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

llvmUmbrella label for LLVM issuesUmbrella label for LLVM issues

Status: Open.

Bug

#172189 In llvm/llvm-project;

· Frityet opened on Dec 14, 2025

[MLIR][MemRef] GenericAtomicRMW crashes when converting to LLVM when result op is defined outside the region

mlir

Status: Open.

#172184 In llvm/llvm-project;

· ashermancinelli opened on Dec 13, 2025

[clang-tidy] readability-simplify-boolean-expr should handle if statements with init statements

clang-tidy

Status: Open.

#172180 In llvm/llvm-project;

· denzor200 opened on Dec 13, 2025

[missed-opt] [instcombine] fshl/fshr not pushed into constant-argument phi

llvm:instcombineCovers the InstCombine, InstSimplify and AggressiveInstCombine passesCovers the InstCombine, InstSimplify and AggressiveInstCombine passes

missed-optimization

Status: Open.

#172176 In llvm/llvm-project;

· purplesyringa opened on Dec 13, 2025

[missed-opt] [x86_64] Suboptimal movzx after inline assembly returning a byte

backend:X86

missed-optimization

Status: Open.

#172172 In llvm/llvm-project;

· purplesyringa opened on Dec 13, 2025

[Clang] <code>clang::CodeGenerator</code> is completely unusable

clang:as-a-librarylibclang and C++ APIlibclang and C++ API

Status: Open.

Bug

#172169 In llvm/llvm-project;

· Sirraide opened on Dec 13, 2025

Bytecode interpreter: comparing pointers behave differently than ExprConstant

clang:bytecodeIssues for the clang bytecode constexpr interpreterIssues for the clang bytecode constexpr interpreter

Status: Open.

#172165 In llvm/llvm-project;

· hanickadot opened on Dec 13, 2025

[clang-cl/Windows] Runtime crash/stack corruption when passing captureless lambda directly to C function pointer

clang-cl`clang-cl` driver. Don't use for other compiler parts`clang-cl` driver. Don't use for other compiler parts

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#172162 In llvm/llvm-project;

· LearnerJhz opened on Dec 13, 2025