[unix-history] / usr / src / lib / libc / i386 / gen / fixunsdfsi.s

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
	.asciz "@(#)fixunsdfsi.s	8.1	%G%"
#endif /* LIBC_SCCS and not lint */

	.globl ___fixunsdfsi
___fixunsdfsi:
	fldl	4(%esp)		/* argument double to accum stack */
	frndint			/* create integer */
	fcoml	fbiggestsigned	/* bigger than biggest signed? */
	fstsw	%ax
	sahf
	jnb	1f
	
	fistpl	4(%esp)
	movl	4(%esp),%eax
	ret

1:	fsubl	fbiggestsigned	/* reduce for proper conversion */
	fistpl	4(%esp)		/* convert */
	movl	4(%esp),%eax
	orl	$0x80000000,%eax	/* restore bias */
	ret

fbiggestsigned:	.double	0r2147483648.0
Commit	Line	Data
95001734	1	/*-
b17c65bb KB	2	* Copyright (c) 1990, 1993
b17c65bb KB	3	* The Regents of the University of California. All rights reserved.
95001734 WN	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* William Jolitz.
	7	*
	8	* %sccs.include.redist.c%
	9	*/
	10
	11	#if defined(LIBC_SCCS) && !defined(lint)
b17c65bb	12	.asciz "@(#)fixunsdfsi.s 8.1 %G%"
95001734 WN	13	#endif /* LIBC_SCCS and not lint */
	14
	15	.globl ___fixunsdfsi
	16	___fixunsdfsi:
	17	fldl 4(%esp) /* argument double to accum stack */
	18	frndint /* create integer */
	19	fcoml fbiggestsigned /* bigger than biggest signed? */
	20	fstsw %ax
	21	sahf
	22	jnb 1f
	23
	24	fistpl 4(%esp)
	25	movl 4(%esp),%eax
	26	ret
	27
	28	1: fsubl fbiggestsigned /* reduce for proper conversion */
	29	fistpl 4(%esp) /* convert */
	30	movl 4(%esp),%eax
	31	orl $0x80000000,%eax /* restore bias */
	32	ret
	33
	34	fbiggestsigned: .double 0r2147483648.0