[libc-commits] [PATCH] D115408: [libc] Implement correctly rounded logf based on RLIBM library.

[Santosh Nagarakatte via Phabricator via libc-commits]

santoshn added a comment.

If the goal is to generate 5th degree polynomial for log for the round-to-nearest with the specified polynomial evaluation in the patch.

Here is the best polynomial that I could generate as of now with 3 special case inputs;

Polynomial: y=0.0000000000000000000000000000000000000000000000000000000000000000000000e+00 x^(0) + 1.0000000000073561157165613622055388987064361572265625000000000000000000e+00 x^(1) + -5.0000000925149434838345996467978693544864654541015625000000000000000000e-01 x^(2) + 3.3333714042884438066849384085799101740121841430664062500000000000000000e-01 x^(3) + -2.5063110611886163514583358846721239387989044189453125000000000000000000e-01 x^(4) + 2.3503273830199439276000816789746750146150588989257812500000000000000000e-01 x^(5)

Special case inputs:

1.7966015845941743847569149750142969423905014991760253906250000000000000e-03
2.6190722430193863652647667805695164133794605731964111328125000000000000e-03
3.7279721707274009363797251381811292958445847034454345703125000000000000e-03

The constant term is 0.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D115408/new/

https://reviews.llvm.org/D115408