forked from OSchip/llvm-project
e15b2da42f
Simplify `tanf` implementation and improve its performance. Completely reuse the implementation of `sinf`, `cosf`, `sincosf` and use the definition `tan(x) = sin(x)/cos(x)`. Performance benchmark using perf tool from the CORE-MATH project on Ryzen 1700: ``` $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh tanf GNU libc version: 2.35 GNU libc release: stable CORE-MATH reciprocal throughput : 18.558 System LIBC reciprocal throughput : 49.919 BEFORE: LIBC reciprocal throughput : 36.480 LIBC reciprocal throughput : 27.217 (with `-msse4.2` flag) LIBC reciprocal throughput : 20.205 (with `-mfma` flag) AFTER: LIBC reciprocal throughput : 30.337 LIBC reciprocal throughput : 21.072 (with `-msse4.2` flag) LIBC reciprocal throughput : 15.804 (with `-mfma` flag) $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh tanf --latency GNU libc version: 2.35 GNU libc release: stable CORE-MATH latency : 56.702 System LIBC latency : 107.206 BEFORE LIBC latency : 97.598 LIBC latency : 91.119 (with `-msse4.2` flag) LIBC latency : 82.655 (with `-mfma` flag) AFTER LIBC latency : 74.560 LIBC latency : 66.575 (with `-msse4.2` flag) LIBC latency : 61.636 (with `-mfma` flag) ``` Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D134575 |
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| .. | ||
| _static | ||
| CMakeLists.txt | ||
| README.txt | ||
| api_test.rst | ||
| build_system.rst | ||
| clang_tidy_checks.rst | ||
| conf.py | ||
| entrypoints.rst | ||
| fuzzing.rst | ||
| ground_truth_specification.rst | ||
| header_gen_scheme.svg | ||
| header_generation.rst | ||
| implementation_standard.rst | ||
| index.rst | ||
| layering.rst | ||
| math.rst | ||
| mechanics_of_public_api.rst | ||
| redirectors.rst | ||
| redirectors_schematic.svg | ||
| runtimes_build.rst | ||
| source_layout.rst | ||
| stdio.rst | ||
| strings.rst | ||
README.txt
libc Documentation ================== The libc documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBC_INCLUDE_DOCS=ON After configuring libc with these options the make rule `docs-libc-html` should be available.