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[X86][Costmodel] Load/store i64/f64 Stride=2 VF=16 interleaving costs

Authored by lebedev.ri on Oct 1 2021, 6:53 AM.

Description

[X86][Costmodel] Load/store i64/f64 Stride=2 VF=16 interleaving costs

The only sched models that for cpu's that support avx2
but not avx512 are: haswell, broadwell, skylake, zen1-3

For load we have:
https://godbolt.org/z/1WMTojvfW - for intels Block RThroughput: =16.0; for ryzens, Block RThroughput: <=8.0
So pick cost of 16.

For store we have:
https://godbolt.org/z/1WMTojvfW - for intels Block RThroughput: =16.0; for ryzens, Block RThroughput: <=16.0
So pick cost of 16.

I'm directly using the shuffling asm the llc produced,
without any manual fixups that may be needed
to ensure sequential execution.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D110840