finitel.s revision ddc0e0b53c661f6e439e3b7072b3ef353eadb4af
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "finitel.s"
#include "libm.h"
ENTRY(finitel)
movl 12(%esp),%eax / %ax <-- sign&bexp(x)
testl $0x80000000,8(%esp) / ZF = 1 iff hi_32(sgnfcnd(x))'s msb = 0
jz .chk_denormal_or_0
notl %eax / not(bexp) = 0 iff bexp = all 1's
andl $0x00007fff,%eax / ZF <-- 1 iff not(bexp) = 0
jz .done / no jump if arg. is finite
movl $1,%eax / ansi needs %eax = 1
.done:
ret
.chk_denormal_or_0:
andl $0x00007fff,%eax / ZF <-- 1 iff bexp = 0 iff denormal or 0
jnz .unsupported / jump if arg has unsupported format
movl $1,%eax / ansi needs %eax = 1
ret
.unsupported:
movl $0,%eax / unsupported format does not represent
ret / a finite number
.align 4
SET_SIZE(finitel)