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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
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.