glibc/sysdeps/libm-i387/s_log1p.S

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/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
RCSID("$NetBSD: s_log1p.S,v 1.7 1995/05/09 00:10:58 jtc Exp $")
/*
* Since the fyl2xp1 instruction has such a limited range:
* -(1 - (sqrt(2) / 2)) <= x <= sqrt(2) - 1
* it's not worth trying to use it.
*/
ENTRY(__log1p)
fldln2
fldl 4(%esp)
fld1
faddp
fyl2x
ret
weak_alias (__log1p, log1p)