error: no member named 'bitwise_rshift' in namespace 'xsimd'

[mbasmanova]

I'm new to xsimd and SIMD in general, hence, apologize for a noob's question.

I have a vector int8_t that stores 4-bit integers, 2 values per entry. I'm trying to load values at even indices into one SIMD register and values at odd indices into another SIMD register.

I'm trying to apply bitwise_rshift to a batch of 8-bit integers (int8_t), but getting a compile error:

error: no member named 'bitwise_rshift' in namespace 'xsimd'


    std::vector<int8_t> deltas_;
...
    const auto bucketMask = xsimd::broadcast(kBucketMask);
    auto batch1 = xsimd::load_unaligned(deltas_.data());
    batch1 = xsimd::bitwise_and(batch1, bucketMask);

    auto batch2 = xsimd::load_unaligned(deltas_.data());
    batch2 = xsimd::bitwise_rshift(batch2, 4); // <----------- compile error happens here

I wonder if xsimd::bitwise_rshift is supposed to work and if there is an example of proper usage I could refer to.

[mbasmanova]

Perhaps, I'm missing PR #933 from ~10 months ago.

As a side effect, also expose xsimd::bitwise_lshift and xsimd::bitwise_rshift
functions that were only exposed through their operator counterpart.

[mbasmanova]

I'm able to workaround the compiler error using

batch2 = xsimd::kernel::bitwise_rshift(batch2, 4, xsimd::default_arch{});

[serge-sans-paille]

can you try with the latest revision of xsimd? This seems to work properly:

https://godbolt.org/z/haabYzcWc

(assuming Intel architecture)

[mbasmanova]

@serge-sans-paille Thanks. It does seem to be a problem with my older version.