freebsd-nq/lib/libc/gen/ldexp.c

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * ldexp() and scalbn() are defined to be identical, but ldexp() lives in libc
 * for backwards compatibility.
 */
#define scalbn ldexp
#include "../../msun/src/s_scalbn.c"
#undef scalbn
Replace the ldexp() implementation in libc with a renamed copy of the scalbn() implementation from libm. (The two functions are defined to be identical, but ldexp() lives in libc for backwards compatibility.) The old ldexp() implementation... - was more complicated than this one - set errno instead of raising FP exceptions - got some corner cases wrong (e.g. ldexp(1.0, 2000) in round-to-zero mode) The new implementation lives in libc/gen instead of libc/$MACHINE_ARCH/gen, since we don't need N copies of a machine-independent file. The amd64 and i386 platforms retain their fast and correct MD implementations and override this one. 2005-01-22 06:03:40 +00:00			`#include <sys/cdefs.h>`
			`__FBSDID("$FreeBSD$");`

Also use the musl scalbn code for ldexp() Instead of copying the code as 00646ca2047305fce32d99edc7a8e6dfd801f3b4 did, include the implementation with the function name re-defined. 2021-02-25 14:29:44 +00:00			`/*`
			`* ldexp() and scalbn() are defined to be identical, but ldexp() lives in libc`
			`* for backwards compatibility.`
			`*/`
			`#define scalbn ldexp`
			`#include "../../msun/src/s_scalbn.c"`
s_scalbn.c: Add missing float.h include This caused LDBL_MANT_DIG to not be defined and therefore the scalbnl alias was not being emitted for double==long double platforms. Fixes: 760b2ffc ("Update scalbn* functions to the musl versions") Reported by: Jenkins 2021-03-01 14:10:24 +00:00			`#undef scalbn`