[all-commits] [llvm/llvm-project] a205a8: [libc][math] Improve fmul performance by using dou...

[Job Henandez Lara via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a205a854e06d36c1d0def3e3bc3743defdb6abc1
      https://github.com/llvm/llvm-project/commit/a205a854e06d36c1d0def3e3bc3743defdb6abc1
  Author: Job Henandez Lara <hj93 at protonmail.com>
  Date:   2024-09-14 (Sat, 14 Sep 2024)

  Changed paths:
    M libc/src/math/generic/CMakeLists.txt
    M libc/src/math/generic/fmul.cpp
    M libc/test/src/math/fmul_test.cpp
    M libc/test/src/math/performance_testing/CMakeLists.txt
    M libc/test/src/math/performance_testing/fmul_perf.cpp
    M libc/test/src/math/smoke/fmul_test.cpp

  Log Message:
  -----------
  [libc][math] Improve fmul performance by using double-double arithmetic. (#107517)

```
 Performance tests with inputs in denormal range:
-- My function --
     Total time      : 2731072304 ns 
     Average runtime : 68.2767 ns/op 
     Ops per second  : 14646276 op/s 
-- Other function --
     Total time      : 3259744268 ns 
     Average runtime : 81.4935 ns/op 
     Ops per second  : 12270913 op/s 
-- Average runtime ratio --
     Mine / Other's  : 0.837818 

 Performance tests with inputs in normal range:
-- My function --
     Total time      : 93467258 ns 
     Average runtime : 2.33668 ns/op 
     Ops per second  : 427957777 op/s 
-- Other function --
     Total time      : 637295452 ns 
     Average runtime : 15.9324 ns/op 
     Ops per second  : 62765299 op/s 
-- Average runtime ratio --
     Mine / Other's  : 0.146662 

 Performance tests with inputs in normal range with exponents close to each other:
-- My function --
     Total time      : 95764894 ns 
     Average runtime : 2.39412 ns/op 
     Ops per second  : 417690014 op/s 
-- Other function --
     Total time      : 639866770 ns 
     Average runtime : 15.9967 ns/op 
     Ops per second  : 62513075 op/s 
-- Average runtime ratio --
     Mine / Other's  : 0.149664 
```

---------

Co-authored-by: Tue Ly <lntue at google.com>



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