1/*
2 * Written by J.T. Conklin <jtc@netbsd.org>.
3 * Public domain.
4 *
5 * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
6 */
7
8#include <machine/asm.h>
9
10RCSID("$NetBSD: $")
11
12
13#ifdef __ELF__
14	.section .rodata
15#else
16	.text
17#endif
18	.align ALIGNARG(4)
19	ASM_TYPE_DIRECTIVE(one,@object)
20one:	.double 1.0
21	ASM_SIZE_DIRECTIVE(one)
22	/* It is not important that this constant is precise.  It is only
23	   a value which is known to be on the safe side for using the
24	   fyl2xp1 instruction.  */
25	ASM_TYPE_DIRECTIVE(limit,@object)
26limit:	.double 0.29
27	ASM_SIZE_DIRECTIVE(limit)
28
29
30#ifdef PIC
31#define MO(op) op##@GOTOFF(%edx)
32#else
33#define MO(op) op
34#endif
35
36	.text
37ENTRY(__ieee754_logl)
38	fldln2			// log(2)
39	fldt	4(%esp)		// x : log(2)
40#ifdef PIC
41	call	1f
421:	popl	%edx
43	addl	$_GLOBAL_OFFSET_TABLE_+[.-1b], %edx
44#endif
45	fld	%st		// x : x : log(2)
46	fsubl	MO(one)		// x-1 : x : log(2)
47	fld	%st		// x-1 : x-1 : x : log(2)
48	fabs			// |x-1| : x-1 : x : log(2)
49	fcompl	MO(limit)	// x-1 : x : log(2)
50	fnstsw			// x-1 : x : log(2)
51	andb	$0x45, %ah
52	jz	2f
53	fstp	%st(1)		// x-1 : log(2)
54	fyl2xp1			// log(x)
55	ret
56
572:	fstp	%st(0)		// x : log(2)
58	fyl2x			// log(x)
59	ret
60END (__ieee754_logl)
61