chasingegg opened a new issue, #38623:
URL: https://github.com/apache/arrow/issues/38623
### Describe the usage question you have. Please include as many useful
details as possible.
I have briefly go through the building related code, it seems that we can
not use SSE4_2 simd level at runtime?
```
template <typename KernelType>
const KernelType* DispatchExactImpl(const std::vector<KernelType*>& kernels,
const std::vector<TypeHolder>& values) {
const KernelType* kernel_matches[SimdLevel::MAX] = {nullptr};
// Validate arity
for (const auto& kernel : kernels) {
if (kernel->signature->MatchesInputs(values)) {
kernel_matches[kernel->simd_level] = kernel;
}
}
// Dispatch as the CPU feature
#if defined(ARROW_HAVE_RUNTIME_AVX512) || defined(ARROW_HAVE_RUNTIME_AVX2)
auto cpu_info = arrow::internal::CpuInfo::GetInstance();
#endif
#if defined(ARROW_HAVE_RUNTIME_AVX512)
if (cpu_info->IsSupported(arrow::internal::CpuInfo::AVX512)) {
if (kernel_matches[SimdLevel::AVX512]) {
return kernel_matches[SimdLevel::AVX512];
}
}
#endif
#if defined(ARROW_HAVE_RUNTIME_AVX2)
if (cpu_info->IsSupported(arrow::internal::CpuInfo::AVX2)) {
if (kernel_matches[SimdLevel::AVX2]) {
return kernel_matches[SimdLevel::AVX2];
}
}
#endif
if (kernel_matches[SimdLevel::NONE]) {
return kernel_matches[SimdLevel::NONE];
}
return nullptr;
}
```
ARROW_HAVE_RUNTIME_SSE4_2 never used at runtime? Do I miss something, if
this is a bug, I'd like to fix it.
### Component(s)
C++
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