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Incorrect alignment in MSVC compatibility mode

c++11

confirmedVerified by a second partyVerified by a second party

diverges-from:msvcDoes the clang frontend diverge from msvc on this issueDoes the clang frontend diverge from msvc on this issue

platform:windows

Status: Open.

#196308 In llvm/llvm-project;

· Endilll opened on May 7, 2026

[AAarch64][SVE]Clang fails to vectorize prefix-sum pattern with double→unsigned int conversion and loop-carried dependence that GCC successfully vectorizes using SVE

backend:AArch64

llvm:optimizations

missed-optimization

vectorizers

Status: Open.

#196303 In llvm/llvm-project;

· huntersubmit opened on May 7, 2026

[SimplifyCFG] Wrong code at -O1/2/3

generated by fuzzer

llvm:optimizations

miscompilation

Status: Open.

Bug

#196296 In llvm/llvm-project;

· XChy opened on May 7, 2026

[flang] CookedSource::GetSourcePositionRange returns nullopt for labeled-CONTINUE DO terminator

flangFlang issues not falling into any other categoryFlang issues not falling into any other category

Status: Open.

#196291 In llvm/llvm-project;

· zbeekman opened on May 7, 2026

LLDB does not support Thread Local variables on Windows

lldb

platform:windows

Status: Open.

#196288 In llvm/llvm-project;

· DavidSpickett opened on May 7, 2026

Crash in SLPVectorizer.cpp:5194: int llvm::slpvectorizer::BoUpSLP::ScheduleData::incrementUnscheduledDeps(int): Assertion `UnscheduledDeps >= 0 && "Expected valid number of unscheduled deps"' failed.

crash-on-valid

llvm:SLPVectorizer

Status: Open.

#196281 In llvm/llvm-project;

· alexfh opened on May 7, 2026

[x86_64 ABI] va_arg incorrectly extracts stdfix types from overflow_arg_area instead of gp_offset

ABIApplication Binary InterfaceApplication Binary Interface

backend:X86

clang:codegenIR generation bugs: mangling, exceptions, etc.IR generation bugs: mangling, exceptions, etc.

Status: Open.

#196279 In llvm/llvm-project;

· Kamilcuk opened on May 7, 2026

[clangd]opening a valid file with a recursive var-template pattern crashes in Stmt::children

clangd

compiler-rt:asanAddress sanitizerAddress sanitizer

generated by fuzzer

Status: Open.

#196277 In llvm/llvm-project;

· hongtaihu opened on May 7, 2026

__builtin_expect_with_probability(_, _, 0.99) does not trigger select→branch on x86: SelectOptimize uses strict > against a 99/100 threshold

llvm:optimizations

missed-optimization

Status: Open.

#196268 In llvm/llvm-project;

· HFTrader opened on May 7, 2026

[RISC-V] Invalid codegen with Zicfiss + Zcmp

backend:RISC-V

Status: Open.

#196261 In llvm/llvm-project;

· nemanjai opened on May 7, 2026

[Analyzer] clang-analyzer-optin.core.EnumCastOutOfRange ignores -isystem : warns for code in system headers

clang:static analyzer

Status: Open.

#196259 In llvm/llvm-project;

· garima-gupta511 opened on May 7, 2026

[mlir][complex] Track backend impact of explicit FMA lowering for contracted complex.mul

mlir

Status: Open.

#196246 In llvm/llvm-project;

· ParkHanbum opened on May 7, 2026