On 2026-02-10 18:56, Jeffrey Walton wrote:
On Tue, Feb 10, 2026 at 12:37 PM Drew Parsons <[email protected]>
wrote:
xsimd 14.0.0 tests on ppc64el are passing with gcc 15 but failing
with
clang 21.
If I recall correctly... VSX extensions, like vec_vsx_st, were
optional in POWER7 and part of POWER8.
My guess is, the problem is `-mcpu=native` while building on a
downlevel machine. Instead, the CFLAGS and CXXFLAGS should include
`-mcpu=power7 -mvsx` or `-mcpu=power8`.
Someone like David Edelsohn (<[email protected]>) could probably say
more about the VSX unit and what flags it requires.
That sounds plausible. But unfortunately it's not so simple as just
removing native
or adding -mcpu=power7 (or power8 or power9, the test machine is POWER9
altivec supported)
Each of the permutation gets the same set of errors, reproducing the
error from the command line:
$ /usr/bin/clang++ -Wunused-parameter -Wextra -Wreorder
-Wshorten-64-to-32 -std=c++11 -g -fPIC -O3 -DNDEBUG -MD -MT
CMakeFiles/test_xsimd.dir/test_api.cpp.o -MF
CMakeFiles/test_xsimd.dir/test_api.cpp.o.d -o
CMakeFiles/test_xsimd.dir/test_api.cpp.o -c
/xsimd/xsimd-14.0.0/test/test_api.cpp 2>&1 | head -n 50
In file included from /xsimd/xsimd-14.0.0/test/test_api.cpp:12:
In file included from /usr/include/xsimd/xsimd.hpp:63:
In file included from
/usr/include/xsimd/memory/xsimd_aligned_allocator.hpp:27:
In file included from
/usr/include/xsimd/memory/../config/xsimd_arch.hpp:19:
In file included from
/usr/include/xsimd/memory/../config/../types/xsimd_all_registers.hpp:51:
/usr/include/xsimd/memory/../config/../types/xsimd_vsx_register.hpp:67:61:
error: cannot use 'long' with '__vector bool'
67 | XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(unsigned long,
long);
| ^
/usr/include/xsimd/memory/../config/../types/xsimd_vsx_register.hpp:68:52:
error: cannot use 'long' with '__vector bool'
68 | XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(long, long);
| ^
/usr/include/xsimd/memory/../config/../types/xsimd_vsx_register.hpp:70:54:
error: cannot use 'long' with '__vector bool'
70 | XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(double, long);
| ^
In file included from /xsimd/xsimd-14.0.0/test/test_api.cpp:12:
In file included from /usr/include/xsimd/xsimd.hpp:77:
In file included from /usr/include/xsimd/types/xsimd_batch.hpp:520:
In file included from
/usr/include/xsimd/types/../arch/xsimd_isa.hpp:136:
/usr/include/xsimd/types/../arch/./xsimd_vsx.hpp:429:20: error: no
matching function for call to 'vec_ld'
429 | return vec_ld(0, reinterpret_cast<const typename
batch<T, A>::register_type*>(mem));
