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Proposal for an ideal extensible instruction set
Author: Ook Date: 2016-01-05 17:00
Adrian Bocaniciu wrote:
This has the advantage that it simplifies considerably the code that must deal with the initial or final parts of the arrays whose sizes are not a multiple of the size of a vector register or which do not have a correct alignment.

For AVX-512 and longer vector registers it is likely that the code dealing with all the possible cases of lengths and alignments will be much larger than the code for the main loop, and it will increase in geometric progression for each new maximum vector length.

With a vector length register, this extra code will be much smaller and its size will remain unchanged when the size of the vector registers will be increased.

AVX512 also adds masking which is supposed to keep the prolog/epilog overhead small.
I have no hard data if this will work out.
Another approach to get rid of this overhead is the software pipelining variant as described by Ivan Godard in one of his Mill talks.
 
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