https://third-party-mirror.googlesource.com/GRTEv4/+/cf41cedf52c87cf4f27c61e4eb8444ecb811ab13/google3/third_party/grte/v4_src/glibc-2.19/math/cabsf.c
google3/third_party/grte/v4_src/glibc-2.19/math/cabsf.c - GRTEv4 - Git at Google
https://manpages.ubuntu.com/manpages/bionic/man3/cabs.3.html
Ubuntu Manpage: cabs, cabsf, cabsl - absolute value of a complex number
absolute value of a complex number
absolute valueubuntumanpagecabs