[llvm] [flang-rt] Optimise ShallowCopy and use it in CopyInAssign (PR #140569)

Thu May 22 08:06:24 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `flang-rt` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/28751

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
3.058 [4/61/59] Linking CXX static library openmp/tools/archer/libarcher_static.a
3.100 [4/60/60] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_affinity.cpp.o
3.122 [4/59/61] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/transformational.cpp.o
3.228 [4/58/62] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/derived-api.cpp.o
3.296 [4/57/63] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/descriptor.cpp.o
3.300 [4/56/64] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/misc-intrinsic.cpp.o
3.300 [4/55/65] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/connection.cpp.o
3.304 [4/54/66] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_lock.cpp.o
3.329 [4/53/67] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_collapse.cpp.o
3.445 [4/52/68] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o
FAILED: flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang++ --target=powerpc64le-unknown-linux-gnu -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/../flang/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/runtimes/runtimes-bins/flang-rt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wno-unnecessary-virtual-specifier -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=gnu++17 -UNDEBUG -fno-lto -fno-exceptions -fno-rtti -funwind-tables -fno-asynchronous-unwind-tables -U_GLIBCXX_ASSERTIONS -U_LIBCPP_ENABLE_ASSERTIONS -MD -MT flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o -MF flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o.d -o flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/lib/runtime/assign.cpp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/lib/runtime/assign.cpp:594:17: error: use of undeclared identifier 'kNoAsyncId'
  594 |   temp.Allocate(kNoAsyncId);
      |                 ^~~~~~~~~~
1 error generated.
3.456 [4/51/69] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/memory.cpp.o
3.463 [4/50/70] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/stat.cpp.o
3.488 [4/49/71] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/ragged.cpp.o
3.566 [4/48/72] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/environment.cpp.o
3.612 [4/47/73] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/array-constructor.cpp.o
3.640 [4/46/74] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/io-error.cpp.o
3.735 [4/45/75] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/inquiry.cpp.o
3.762 [4/44/76] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_csupport.cpp.o
3.798 [4/43/77] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang/lib/Decimal/binary-to-decimal.cpp.o
3.818 [4/42/78] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/command.cpp.o
3.898 [4/41/79] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/file.cpp.o
3.995 [4/40/80] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/pointer.cpp.o
4.160 [4/39/81] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/z_Linux_util.cpp.o
4.215 [4/38/82] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/type-info.cpp.o
4.336 [4/37/83] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/numeric.cpp.o
4.391 [4/36/84] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/pseudo-unit.cpp.o
4.466 [4/35/85] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/stop.cpp.o
4.484 [4/34/86] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/time-intrinsic.cpp.o
4.693 [4/33/87] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/descriptor-io.cpp.o
4.707 [4/32/88] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_tasking.cpp.o
4.728 [4/31/89] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/external-unit.cpp.o
4.736 [4/30/90] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_atomic.cpp.o
4.812 [4/29/91] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_barrier.cpp.o
4.851 [4/28/92] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit-map.cpp.o
4.929 [4/27/93] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/extensions.cpp.o
4.946 [4/26/94] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/random.cpp.o
4.952 [4/25/95] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang/lib/Decimal/decimal-to-binary.cpp.o
5.053 [4/24/96] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_dispatch.cpp.o
5.275 [4/23/97] Building CXX object openmp/tools/archer/CMakeFiles/archer.dir/ompt-tsan.cpp.o
5.344 [4/22/98] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/derived.cpp.o
5.593 [4/21/99] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/edit-input.cpp.o
5.864 [4/20/100] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/io-api-minimal.cpp.o
5.923 [4/19/101] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_runtime.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/140569