1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24/* 25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 .file "isnanl.s" 30 31#include "libm.h" 32LIBM_ANSI_PRAGMA_WEAK(isnanl,function) 33 34 ENTRY(isnanl) 35 movl 12(%esp),%eax / ax <-- sign bit and exp 36 andl $0x00007fff,%eax 37 jz .not_nan / jump if exp is all 0 38 xorl $0x00007fff,%eax 39 jz .nan_or_inf / jump if exp is all 1 40 testl $0x80000000,8(%esp) 41 jz .got_nan / jump if leading bit is 0 42 movl $0,%eax 43.not_nan: 44 ret 45.nan_or_inf: / note that %eax = 0 from before 46 cmpl $0x80000000,8(%esp) / what is first half of significand? 47 jnz .got_nan / jump if not equal to 0x80000000 48 testl $0xffffffff,4(%esp) / is second half of significand 0? 49 jnz .got_nan / jump if not equal to 0 50 ret 51.got_nan: 52 movl $1,%eax 53 ret 54 .align 4 55 SET_SIZE(isnanl) 56