484319f497
Add another exceptional value and fix the case when |x| is small. Performance tests with CORE-MATH project scripts: With FMA instructions on Ryzen 1700: ``` $ ./perf.sh expm1f LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a CORE-MATH reciprocal throughput : 15.362 System LIBC reciprocal throughput : 53.194 LIBC reciprocal throughput : 14.595 $ ./perf.sh expm1f --latency LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a CORE-MATH latency : 57.755 System LIBC latency : 147.020 LIBC latency : 60.269 ``` Without FMA instructions: ``` $ ./perf.sh expm1f LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a CORE-MATH reciprocal throughput : 15.362 System LIBC reciprocal throughput : 53.300 LIBC reciprocal throughput : 18.020 $ ./perf.sh expm1f --latency LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a CORE-MATH latency : 57.758 System LIBC latency : 147.025 LIBC latency : 70.304 ``` Reviewed By: michaelrj Differential Revision: https://reviews.llvm.org/D123440
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.