[libc-commits] [PATCH] D150014: [libc][math] Make log10 correctly rounded for non-FMA targets and improve itsperformance.

Tue May 23 04:51:15 PDT 2023

zimmermann6 accepted this revision.
zimmermann6 added a comment.
This revision is now accepted and ready to land.

all worst cases from core-math do pass. However I get a larger reciprocal throughput on a AMD EPYC 7282:

  GNU libc version: 2.36
  GNU libc release: stable
  [####################] 100 %
  Ntrial = 20 ; Min = 21.270 + 0.322 clc/call; Median-Min = 0.302 clc/call; Max = 23.839 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 26.172 + 0.346 clc/call; Median-Min = 0.310 clc/call; Max = 26.798 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 49.688 + 0.306 clc/call; Median-Min = 0.308 clc/call; Max = 50.288 clc/call;

For the latency I get similar values:

  GNU libc version: 2.36
  GNU libc release: stable
  [####################] 100 %
  Ntrial = 20 ; Min = 65.915 + 0.316 clc/call; Median-Min = 0.282 clc/call; Max = 66.518 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 73.612 + 0.389 clc/call; Median-Min = 0.326 clc/call; Max = 74.422 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 66.387 + 0.276 clc/call; Median-Min = 0.303 clc/call; Max = 67.140 clc/call;

Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D150014/new/

https://reviews.llvm.org/D150014