aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/i386/fpu/s_floor.S
blob: 2d6287dc7998c5fea6d5daa262b6519c0059517c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include <machine/asm.h>

RCSID("$NetBSD: s_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $")

ENTRY(__floor)
	fldl	4(%esp)
	subl	$8,%esp
	cfi_adjust_cfa_offset (8)

	fstcw	4(%esp)			/* store fpu control word */

	/* We use here %edx although only the low 1 bits are defined.
	   But none of the operations should care and they are faster
	   than the 16 bit operations.  */
	movl	$0x400,%edx		/* round towards -oo */
	orl	4(%esp),%edx
	andl	$0xf7ff,%edx
	movl	%edx,(%esp)
	fldcw	(%esp)			/* load modified control word */

	frndint				/* round */

	fldcw	4(%esp)			/* restore original control word */

	addl	$8,%esp
	cfi_adjust_cfa_offset (-8)
	ret
END (__floor)
weak_alias (__floor, floor)