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zstd: Asm decoder tweaks #537
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* Add non-bmi amd64 tests * Use BEXTRQ for extracting shifted values. * Move 0 check into getBits.
I run it on an Ice Lake machine with hacked
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@WojciechMula Any objections to this getting merged? |
Not really. Looks good, except for the two regressions. |
@WojciechMula The extremely small encodes are very temperamental. The alloc elimination made those cases significantly better. |
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Sequences only, BMI:
No BMI: