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math/big: improve assembly cores: alignment and unrolling #9244

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griesemer opened this Issue Dec 10, 2014 · 0 comments

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griesemer commented Dec 10, 2014

Suggestions from Torbjörn Granlund (personal e-mail):

"Aligning:

Consider aligning loops to at least a 0 mod 16 address.
Same for function start.

Tail code after unrolling:

Setting up a loop which runs 0-3 iterations is quite expensive.
It should be better to follow the pattern:

    test $2, Rcount
    je       skip2
    restore CF
    [do two "iterations"]
    save CF
  skip2:
    test $2, Rcount
    je       skip1
    restore CF
    [do one "iteration"]
  skip1:
    [footer]

"

@griesemer griesemer self-assigned this Dec 10, 2014

@rsc rsc added this to the Unplanned milestone Apr 10, 2015

@rsc rsc removed release-none labels Apr 10, 2015

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