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WIP: Add ERF#3058

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RaviTriv wants to merge 2 commits into
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RaviTriv:erf
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WIP: Add ERF#3058
RaviTriv wants to merge 2 commits into
google:masterfrom
RaviTriv:erf

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@RaviTriv
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Implementing erf from wishlist.

Thanks for time and effort reviewing :)

Notes

  • WIP; hoping to get feedback and test f32 implementation in CI
  • Currently basing off the cephes approach
    • Originally looked at JXL, but think we may need piecewise approximation in this case
    • JXL approach seems to be about ~14 ops vs current ~45 ops, Trying to see how to bring this down.
  • Suggested target precision to aim for?

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