[libc] [llvm] [libc][NFC] refactor Cortex `memcpy` code (PR #148204)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Wed Jul 16 01:09:02 PDT 2025 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `libc-arm32-qemu-debian-dbg` running on `libc-arm32-qemu-debian` while building `libc,utils` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/215/builds/1253

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

```
Step 4 (annotate) failure: 'python ../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py ...' (failure)
...
  Math tests using MPC will be skipped.


-- check-runtimes does nothing.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/build
@@@BUILD_STEP build libc@@@
Running: ninja libc
[1/5] Building CXX object libc/src/string/CMakeFiles/libc.src.string.memcpy.dir/memcpy.cpp.o
FAILED: libc/src/string/CMakeFiles/libc.src.string.memcpy.dir/memcpy.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_21_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/build/libc/include -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 -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g --target=arm-linux-gnueabihf -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -fpie -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wdeprecated -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -O3 -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/string/CMakeFiles/libc.src.string.memcpy.dir/memcpy.cpp.o -MF libc/src/string/CMakeFiles/libc.src.string.memcpy.dir/memcpy.cpp.o.d -o libc/src/string/CMakeFiles/libc.src.string.memcpy.dir/memcpy.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memcpy.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memcpy.cpp:13:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/inline_memcpy.h:26:
/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/arm/inline_memcpy.h:39:5: error: static_assert failed
    static_assert(false);
    ^             ~~~~~
/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/arm/inline_memcpy.h:57:5: error: static_assert failed "Invalid BlockOp"
    static_assert(false, "Invalid BlockOp");
    ^             ~~~~~
2 errors generated.
[2/5] Building CXX object libc/src/string/CMakeFiles/libc.src.string.mempcpy.dir/mempcpy.cpp.o
FAILED: libc/src/string/CMakeFiles/libc.src.string.mempcpy.dir/mempcpy.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_21_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/build/libc/include -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 -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g --target=arm-linux-gnueabihf -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -fpie -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wdeprecated -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/string/CMakeFiles/libc.src.string.mempcpy.dir/mempcpy.cpp.o -MF libc/src/string/CMakeFiles/libc.src.string.mempcpy.dir/mempcpy.cpp.o.d -o libc/src/string/CMakeFiles/libc.src.string.mempcpy.dir/mempcpy.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/mempcpy.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/mempcpy.cpp:12:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/inline_memcpy.h:26:
/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/arm/inline_memcpy.h:39:5: error: static_assert failed
    static_assert(false);
    ^             ~~~~~
/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/arm/inline_memcpy.h:57:5: error: static_assert failed "Invalid BlockOp"
    static_assert(false, "Invalid BlockOp");
    ^             ~~~~~
2 errors generated.
[3/5] Building CXX object libc/src/string/CMakeFiles/libc.src.string.memmove.dir/memmove.cpp.o
FAILED: libc/src/string/CMakeFiles/libc.src.string.memmove.dir/memmove.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_21_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/build/libc/include -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 -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g --target=arm-linux-gnueabihf -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -fpie -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wdeprecated -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -O3 -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/string/CMakeFiles/libc.src.string.memmove.dir/memmove.cpp.o -MF libc/src/string/CMakeFiles/libc.src.string.memmove.dir/memmove.cpp.o.d -o libc/src/string/CMakeFiles/libc.src.string.memmove.dir/memmove.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memmove.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memmove.cpp:12:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/inline_memcpy.h:26:
/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/arm/inline_memcpy.h:39:5: error: static_assert failed
    static_assert(false);
    ^             ~~~~~
/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/memory_utils/arm/inline_memcpy.h:57:5: error: static_assert failed "Invalid BlockOp"
    static_assert(false, "Invalid BlockOp");
    ^             ~~~~~
2 errors generated.
[4/5] Building CXX object libc/src/string/CMakeFiles/libc.src.string.strcpy.dir/strcpy.cpp.o
FAILED: libc/src/string/CMakeFiles/libc.src.string.strcpy.dir/strcpy.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_21_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/build/libc/include -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 -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g --target=arm-linux-gnueabihf -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -fpie -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wdeprecated -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/string/CMakeFiles/libc.src.string.strcpy.dir/strcpy.cpp.o -MF libc/src/string/CMakeFiles/libc.src.string.strcpy.dir/strcpy.cpp.o.d -o libc/src/string/CMakeFiles/libc.src.string.strcpy.dir/strcpy.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/strcpy.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-arm32-qemu-debian/libc-arm32-qemu-debian-dbg/llvm-project/libc/src/string/strcpy.cpp:12:

```

</details>

https://github.com/llvm/llvm-project/pull/148204

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