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" 32 LIBM_ANSI_PRAGMA_WEAK(isnanl,function) 33 #include "libm_synonyms.h" 34 35 ENTRY(isnanl) 36 movl 12(%esp),%eax / ax <-- sign bit and exp 37 andl $0x00007fff,%eax 38 jz .not_nan / jump if exp is all 0 39 xorl $0x00007fff,%eax 40 jz .nan_or_inf / jump if exp is all 1 41 testl $0x80000000,8(%esp) 42 jz .got_nan / jump if leading bit is 0 43 movl $0,%eax 44 .not_nan: 45 ret 46 .nan_or_inf: / note that %eax = 0 from before 47 cmpl $0x80000000,8(%esp) / what is first half of significand? 48 jnz .got_nan / jump if not equal to 0x80000000 49 testl $0xffffffff,4(%esp) / is second half of significand 0? 50 jnz .got_nan / jump if not equal to 0 51 ret 52 .got_nan: 53 movl $1,%eax 54 ret 55 .align 4 56 SET_SIZE(isnanl)