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Use nearest_integer instructions to improve expf performance. Performance tests with CORE-MATH's perf tool: Before the patch: ``` $ ./perf.sh expm1f LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH reciprocal throughput : 10.096 System LIBC reciprocal throughput : 44.036 LIBC reciprocal throughput : 11.575 $ ./perf.sh expm1f --latency LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH latency : 42.239 System LIBC latency : 122.815 LIBC latency : 50.122 ``` After the patch: ``` $ ./perf.sh expm1f LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH reciprocal throughput : 10.046 System LIBC reciprocal throughput : 43.899 LIBC reciprocal throughput : 9.179 $ ./perf.sh expm1f --latency LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH latency : 42.078 System LIBC latency : 120.488 LIBC latency : 41.528 ``` Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D130502 |
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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.