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glibc/sysdeps/i386/fpu/s_log1pf.S
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/* | |
* Written by J.T. Conklin <jtc@netbsd.org>. | |
* Public domain. | |
*/ | |
#include <machine/asm.h> | |
RCSID("$NetBSD: s_log1pf.S,v 1.4 1995/05/09 00:13:05 jtc Exp $") | |
.section .rodata | |
.align ALIGNARG(4) | |
/* The fyl2xp1 can only be used for values in | |
-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2 | |
0.29 is a safe value. | |
*/ | |
limit: .float 0.29 | |
one: .float 1.0 | |
/* | |
* Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29, | |
* otherwise fyl2x with the needed extra computation. | |
*/ | |
.text | |
ENTRY(__log1pf) | |
fldln2 | |
flds 4(%esp) | |
#ifdef PIC | |
LOAD_PIC_REG (dx) | |
#endif | |
fxam | |
fnstsw | |
fld %st | |
sahf | |
jc 3f // in case x is NaN or ±Inf | |
4: fabs | |
#ifdef PIC | |
fcomps limit@GOTOFF(%edx) | |
#else | |
fcomps limit | |
#endif | |
fnstsw | |
sahf | |
jc 2f | |
#ifdef PIC | |
fadds one@GOTOFF(%edx) | |
#else | |
fadds one | |
#endif | |
fyl2x | |
ret | |
2: fyl2xp1 | |
ret | |
3: jp 4b // in case x is ±Inf | |
fstp %st(1) | |
fstp %st(1) | |
ret | |
END (__log1pf) |