a5466f0436
Improve the performance of expm1f: - Rearrange the selection logic for different cases to improve the overall throughput. - Use the same degree-4 polynomial for large inputs as `expf` (https://reviews.llvm.org/D122418), reduced from a degree-7 polynomial. Performance benchmark using perf tool from CORE-MATH project (https://gitlab.inria.fr/core-math/core-math/-/tree/master): Before this patch: ``` $ ./perf.sh expm1f CORE-MATH reciprocal throughput : 15.362 System LIBC reciprocal throughput : 53.288 LIBC reciprocal throughput : 54.572 $ ./perf.sh expm1f --latency CORE-MATH latency : 57.759 System LIBC latency : 147.146 LIBC latency : 118.057 ``` After this patch: ``` $ ./perf.sh expm1f CORE-MATH reciprocal throughput : 15.359 System LIBC reciprocal throughput : 53.188 LIBC reciprocal throughput : 14.600 $ ./perf.sh expm1f --latency CORE-MATH latency : 57.774 System LIBC latency : 147.119 LIBC latency : 60.280 ``` Reviewed By: michaelrj, santoshn, zimmermann6 Differential Revision: https://reviews.llvm.org/D122538 |
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| AOR_v20.02 | ||
| benchmarks | ||
| cmake/modules | ||
| config | ||
| docs | ||
| fuzzing | ||
| include | ||
| lib | ||
| loader | ||
| spec | ||
| src | ||
| test | ||
| utils | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| LICENSE.TXT | ||
| README.txt | ||
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.