[libc-commits] [PATCH] D147755: [libc][math] Update range reduction step for logf and reduce its latency.

Fri Apr 7 08:38:16 PDT 2023

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

thanks all tests do pass now. For the reciprocal throughput I get:

  zimmerma at biscotte:~/svn/core-math$ LIBM=/localdisk/zimmerma/llvm-project/build/projects/libc/lib/libllvmlibc.a ./perf.sh logf
  GNU libc version: 2.36
  GNU libc release: stable
  [####################] 100 %
  Ntrial = 20 ; Min = 10.839 + 0.378 clc/call; Median-Min = 0.304 clc/call; Max = 13.593 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 7.240 + 0.351 clc/call; Median-Min = 0.307 clc/call; Max = 9.576 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 18.822 + 0.339 clc/call; Median-Min = 0.314 clc/call; Max = 19.396 clc/call;

and for the latency:

  zimmerma at biscotte:~/svn/core-math$ PERF_ARGS=--latency LIBM=/localdisk/zimmerma/llvm-project/build/projects/libc/lib/libllvmlibc.a ./perf.sh logf
  GNU libc version: 2.36
  GNU libc release: stable
  [####################] 100 %
  Ntrial = 20 ; Min = 46.968 + 0.321 clc/call; Median-Min = 0.301 clc/call; Max = 47.649 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 38.243 + 0.328 clc/call; Median-Min = 0.318 clc/call; Max = 38.928 clc/call;
  [####################] 100 %
  Ntrial = 20 ; Min = 54.652 + 0.404 clc/call; Median-Min = 0.329 clc/call; Max = 55.396 clc/call;

Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D147755