[clang] [clang][bytecode] Fix right shifts greater than bitwidth (PR #202851)

Wed Jun 10 00:09:04 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `amdgpu-offload-build-only` running on `AMD-bb-w-01` while building `clang` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/226/builds/9164

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 4 (annotate) failure: '../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py --jobs=32' (failure)
...
[229/1086] Building generated/OffloadEntryPoints.inc.gen...
[230/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/iso_c_binding.f90-pp.f90
[231/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/iso_fortran_env_impl.f90-pp.f90
[232/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/iso_fortran_env.f90-pp.f90
[233/1086] Building generated/OffloadFuncs.inc.gen...
[234/1086] Building generated/OffloadImplFuncDecls.inc.gen...
[235/1086] Building include/OffloadErrcodes.inc...
[236/1086] Building generated/OffloadPrint.hpp.gen...
[237/1086] Building include/OffloadInfo.inc...
[238/1086] Generating OffloadImplFuncDecls.inc
FAILED: offload/liboffload/API/OffloadImplFuncDecls.inc /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-bins/offload/liboffload/API/OffloadImplFuncDecls.inc 
cd /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-bins/offload/liboffload/API && /home/botworker/bbot/amdgpu-offload-build-only/build/bin/clang-format -i generated/OffloadImplFuncDecls.inc.gen && /usr/local/therock-tools/bin/cmake -E copy_if_different generated/OffloadImplFuncDecls.inc.gen /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-bins/offload/liboffload/API/OffloadImplFuncDecls.inc
/bin/sh: /home/botworker/bbot/amdgpu-offload-build-only/build/bin/clang-format: Permission denied
[239/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/ieee_exceptions.f90-pp.f90
[240/1086] Generating OffloadFuncs.inc
[241/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_csupport.cpp.o
[242/1086] Generating OffloadEntryPoints.inc
[243/1086] Generating OffloadAPI.h
[244/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/__cuda_device.f90-pp.f90
[245/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/ieee_features.f90-pp.f90
[246/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_sched.cpp.o
[247/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/ieee_arithmetic.f90-pp.f90
[248/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/cuda_runtime_api.f90-pp.f90
[249/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/cooperative_groups.f90-pp.f90
[250/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/thirdparty/ittnotify/ittnotify_static.cpp.o
[251/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/cudadevice.f90-pp.f90
[252/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_lock.cpp.o
[253/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_tasking.cpp.o
[254/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_barrier.cpp.o
[255/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_version.cpp.o
[256/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_atomic.cpp.o
[257/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_ftn_cdecl.cpp.o
[258/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_cancel.cpp.o
[259/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_ftn_extra.cpp.o
[260/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_dispatch.cpp.o
[261/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_runtime.cpp.o
[262/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_collapse.cpp.o
[263/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/ompd-specific.cpp.o
[264/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/z_Linux_util.cpp.o
[265/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_taskdeps.cpp.o
[266/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_settings.cpp.o
[267/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/ompt-general.cpp.o
[268/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_gsupport.cpp.o
[269/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_affinity.cpp.o
[270/1086] Building CXX object compiler-rt/lib/memprof/CMakeFiles/RTMemprof.x86_64.dir/memprof_interceptors.cpp.o
[271/1086] Building CXX object compiler-rt/lib/asan/CMakeFiles/RTAsan.x86_64.dir/asan_interceptors.cpp.o
ninja: build stopped: subcommand failed.
[8627/8640] Linking CXX executable bin/tco
FAILED: runtimes/runtimes-stamps/runtimes-build /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-stamps/runtimes-build 
Step 7 (build cmake config) failure: build cmake config (failure)
...
[229/1086] Building generated/OffloadEntryPoints.inc.gen...
[230/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/iso_c_binding.f90-pp.f90
[231/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/iso_fortran_env_impl.f90-pp.f90
[232/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/iso_fortran_env.f90-pp.f90
[233/1086] Building generated/OffloadFuncs.inc.gen...
[234/1086] Building generated/OffloadImplFuncDecls.inc.gen...
[235/1086] Building include/OffloadErrcodes.inc...
[236/1086] Building generated/OffloadPrint.hpp.gen...
[237/1086] Building include/OffloadInfo.inc...
[238/1086] Generating OffloadImplFuncDecls.inc
FAILED: offload/liboffload/API/OffloadImplFuncDecls.inc /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-bins/offload/liboffload/API/OffloadImplFuncDecls.inc 
cd /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-bins/offload/liboffload/API && /home/botworker/bbot/amdgpu-offload-build-only/build/bin/clang-format -i generated/OffloadImplFuncDecls.inc.gen && /usr/local/therock-tools/bin/cmake -E copy_if_different generated/OffloadImplFuncDecls.inc.gen /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-bins/offload/liboffload/API/OffloadImplFuncDecls.inc
/bin/sh: /home/botworker/bbot/amdgpu-offload-build-only/build/bin/clang-format: Permission denied
[239/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/ieee_exceptions.f90-pp.f90
[240/1086] Generating OffloadFuncs.inc
[241/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_csupport.cpp.o
[242/1086] Generating OffloadEntryPoints.inc
[243/1086] Generating OffloadAPI.h
[244/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/__cuda_device.f90-pp.f90
[245/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/ieee_features.f90-pp.f90
[246/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_sched.cpp.o
[247/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/ieee_arithmetic.f90-pp.f90
[248/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/cuda_runtime_api.f90-pp.f90
[249/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/cooperative_groups.f90-pp.f90
[250/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/thirdparty/ittnotify/ittnotify_static.cpp.o
[251/1086] Building Fortran preprocessed flang-rt/lib/runtime/CMakeFiles/flang_rt.mod.dir/cudadevice.f90-pp.f90
[252/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_lock.cpp.o
[253/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_tasking.cpp.o
[254/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_barrier.cpp.o
[255/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_version.cpp.o
[256/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_atomic.cpp.o
[257/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_ftn_cdecl.cpp.o
[258/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_cancel.cpp.o
[259/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_ftn_extra.cpp.o
[260/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_dispatch.cpp.o
[261/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_runtime.cpp.o
[262/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_collapse.cpp.o
[263/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/ompd-specific.cpp.o
[264/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/z_Linux_util.cpp.o
[265/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_taskdeps.cpp.o
[266/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_settings.cpp.o
[267/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/ompt-general.cpp.o
[268/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_gsupport.cpp.o
[269/1086] Building CXX object openmp/runtime/src/CMakeFiles/obj.omp.dir/kmp_affinity.cpp.o
[270/1086] Building CXX object compiler-rt/lib/memprof/CMakeFiles/RTMemprof.x86_64.dir/memprof_interceptors.cpp.o
[271/1086] Building CXX object compiler-rt/lib/asan/CMakeFiles/RTAsan.x86_64.dir/asan_interceptors.cpp.o
ninja: build stopped: subcommand failed.
[8627/8640] Linking CXX executable bin/tco
FAILED: runtimes/runtimes-stamps/runtimes-build /home/botworker/bbot/amdgpu-offload-build-only/build/runtimes/runtimes-stamps/runtimes-build 

```

</details>

https://github.com/llvm/llvm-project/pull/202851