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dfmal
ISO C23 specification:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n3096.pdf section 7.12.14.5
Documentation:
https://www.gnu.org/software/libc/manual/html_node/Misc-FP-Arithmetic.html.
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib: