Finally `rsqrt()` made its way into C23 \[<https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf>\], and a couple more years later it has been implemented in glibc 2.42 \[<https://sourceware.org/glibc/manual/2.42/html_node/Exponents-and-Logarithms.html#index-rsqrt>\].
Four years later, `rsqrt()` made its way into C23 \[<https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf>\], and a couple more years later it has been implemented in glibc 2.42 \[<https://sourceware.org/glibc/manual/2.42/html_node/Exponents-and-Logarithms.html#index-rsqrt>\].
