Re: [boost] [simd] Hardware support

On 10/04/2017 14:44, Bjorn Reese via Boost wrote:

On 04/08/2017 01:06 PM, Mathias Gaunard via Boost wrote:

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On 8 April 2017 at 11:14, Bjorn Reese via Boost wrote:

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What does Boost.SIMD currently do on unsupported platforms? Revert

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back to SISD?

Yes, likewise if you're on x86 but requesting an operation that your hardware does not support, it will still work using the best possible implementation.

Is there any run-time overhead (e.g. induced by pack, load, save, etc.) in the SISD case?

This is a case we don't benchmark much but the strategy is to statically unroll the scalar calls over the pack element which are store din an std::array. So I suspect the overhead is not worth than having called the scalar function Nth times.