a68bbf42fa
Implement double precision log function correctly rounded to all rounding modes. See https://reviews.llvm.org/D150014 for a more detail description of the algorithm. **Performance** - For `0.5 <= x <= 2`, the fast pass hitting rate is about 99.93%. - Reciprocal throughput from CORE-MATH's perf tool on Ryzen 5900X: ``` $ ./perf.sh log GNU libc version: 2.35 GNU libc release: stable -- CORE-MATH reciprocal throughput -- with FMA [####################] 100 % Ntrial = 20 ; Min = 17.465 + 0.596 clc/call; Median-Min = 0.602 clc/call; Max = 18.389 clc/call; -- CORE-MATH reciprocal throughput -- without FMA (-march=x86-64-v2) [####################] 100 % Ntrial = 20 ; Min = 54.961 + 2.606 clc/call; Median-Min = 2.180 clc/call; Max = 59.583 clc/call; -- System LIBC reciprocal throughput -- [####################] 100 % Ntrial = 20 ; Min = 12.608 + 0.276 clc/call; Median-Min = 0.359 clc/call; Max = 13.147 clc/call; -- LIBC reciprocal throughput -- with FMA [####################] 100 % Ntrial = 20 ; Min = 20.952 + 0.468 clc/call; Median-Min = 0.602 clc/call; Max = 21.881 clc/call; -- LIBC reciprocal throughput -- without FMA [####################] 100 % Ntrial = 20 ; Min = 18.569 + 0.552 clc/call; Median-Min = 0.601 clc/call; Max = 19.259 clc/call; ``` - Latency from CORE-MATH's perf tool on Ryzen 5900X: ``` $ ./perf.sh log --latency GNU libc version: 2.35 GNU libc release: stable -- CORE-MATH latency -- with FMA [####################] 100 % Ntrial = 20 ; Min = 48.431 + 0.699 clc/call; Median-Min = 0.073 clc/call; Max = 51.269 clc/call; -- CORE-MATH latency -- without FMA (-march=x86-64-v2) [####################] 100 % Ntrial = 20 ; Min = 64.865 + 3.235 clc/call; Median-Min = 3.475 clc/call; Max = 71.788 clc/call; -- System LIBC latency -- [####################] 100 % Ntrial = 20 ; Min = 42.151 + 2.090 clc/call; Median-Min = 2.270 clc/call; Max = 44.773 clc/call; -- LIBC latency -- with FMA [####################] 100 % Ntrial = 20 ; Min = 35.266 + 0.479 clc/call; Median-Min = 0.373 clc/call; Max = 36.798 clc/call; -- LIBC latency -- without FMA [####################] 100 % Ntrial = 20 ; Min = 48.518 + 0.484 clc/call; Median-Min = 0.500 clc/call; Max = 49.896 clc/call; ``` - Accurate pass latency: ``` $ ./perf.sh log --latency --simple_stat GNU libc version: 2.35 GNU libc release: stable -- CORE-MATH latency -- with FMA 598.306 -- CORE-MATH latency -- without FMA (-march=x86-64-v2) 632.925 -- LIBC latency -- with FMA 455.632 -- LIBC latency -- without FMA 488.564 ``` Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D150131 |
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| bolt | ||
| clang | ||
| clang-tools-extra | ||
| cmake | ||
| compiler-rt | ||
| cross-project-tests | ||
| flang | ||
| libc | ||
| libclc | ||
| libcxx | ||
| libcxxabi | ||
| libunwind | ||
| lld | ||
| lldb | ||
| llvm | ||
| llvm-libgcc | ||
| mlir | ||
| openmp | ||
| polly | ||
| pstl | ||
| runtimes | ||
| third-party | ||
| utils | ||
| .arcconfig | ||
| .arclint | ||
| .clang-format | ||
| .clang-tidy | ||
| .git-blame-ignore-revs | ||
| .gitignore | ||
| .mailmap | ||
| CONTRIBUTING.md | ||
| LICENSE.TXT | ||
| README.md | ||
| SECURITY.md | ||
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