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Miscompilation : incorrect optimization of a loop unrolling

loopoptim

undefined behaviour

Status: Closed (completed).

#204975 In llvm/llvm-project;

· by dev86955 was closed on Jun 21, 2026

[clang][openmp] OpenMP target offloading fails to detect NVIDIA device (omp_get_num_devices returns 0)

clang:openmpOpenMP related changes to ClangOpenMP related changes to Clang

Status: Open.

#204973 In llvm/llvm-project;

· Sa4dUs opened on Jun 21, 2026

pext(x & m, m) -> pext(x, m)

good first issuehttps://github.com/llvm/llvm-project/contributehttps://github.com/llvm/llvm-project/contribute

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

missed-optimization

Status: Open.

#204945 In llvm/llvm-project;

· Validark opened on Jun 20, 2026

[X86][clang] __builtin_cpu_supports should support foo+bar

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

Status: Open.

#204942 In llvm/llvm-project;

· Andarwinux opened on Jun 20, 2026

[Documentation] [Statistics] compiling software via clang on Linux

clangClang issues not falling into any other categoryClang issues not falling into any other category

questionA question, not bug report. Check out https://llvm.org/docs/GettingInvolved.html instead!A question, not bug report. Check out https://llvm.org/docs/GettingInvolved.html instead!

Status: Open.

#204940 In llvm/llvm-project;

· rubyFeedback opened on Jun 20, 2026

[AArch64][SVE] partial_reduce v16i8 -> v2i64 drops high lanes when VL > 128

backend:AArch64

miscompilation

Status: Open.

#204939 In llvm/llvm-project;

· mble opened on Jun 20, 2026

[LoopVectorize] -vector-library selects a 512-bit veclib call (amd_vrd8_log) on an AVX2-only target

new issue

Status: Open.

#204930 In llvm/llvm-project;

· ricardoV94 opened on Jun 20, 2026

[mlir](convert-tensor-to-spirv) mlir-opt crashes at BuiltinAttributes.cpp:366 with assertion `(getType().isIndex() || getType().isSignlessInteger()) && "must be signless integer"' failed.

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

mlir

Status: Open.

Bug

#204911 In llvm/llvm-project;

· Aran-414 opened on Jun 20, 2026

[mlir][arith](int-range-optimizations) mlir-opt crashes at BuiltinAttributes.cpp.inc:403 with assertion `value.getBitWidth() == intTy.getWidth() && "IntegerAttr::get: APInt bit width must match integer type width"' failed.

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

mlir

Status: Open.

Bug

#204909 In llvm/llvm-project;

· Aran-414 opened on Jun 20, 2026

[mlir](tosa-to-tensor) mlir-opt crashes at BuiltinAttributes.cpp:1115 with assertion `newType.getElementType() == curType.getElementType() && "expected the same element type"' failed.

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

mlir

Status: Open.

Bug

#204907 In llvm/llvm-project;

· Aran-414 opened on Jun 20, 2026

[mlir][xegpu](xegpu-propagate-layout) mlir-opt crashes at FunctionInterfaces.h.inc:1251 with `index < (*static_cast<ConcreteOp *>(this)).getNumArguments() && "invalid argument number"' failed.

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

mlir

Status: Open.

Bug

#204906 In llvm/llvm-project;

· Aran-414 opened on Jun 20, 2026

[mlir][transform](transform-interpreter) mlir-opt crashes at ArrayRef.h:247 with assertion `Index < Length && "Invalid index!"' failed.

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

mlir

Status: Open.

Bug

#204905 In llvm/llvm-project;

· Aran-414 opened on Jun 20, 2026