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 "isnanf.s" 30 31#include "libm.h" 32LIBM_ANSI_PRAGMA_WEAK(isnanf,function) 33 .weak _isnanf 34 .type _isnanf,@function 35_isnanf = __isnanf 36 37 ENTRY(isnanf) 38 movl 4(%esp),%eax / eax <-- x 39 andl $0x7fffffff,%eax / eax <-- abs(x) 40 subl $0x7f800000,%eax / ZF <-- 1 iff x is infinite 41 jae .nan_or_inf / no jump iff arg. is finite 42 movl $0,%eax 43 ret 44.nan_or_inf: 45 jnz .got_nan / no jump if arg. infinite; 46 / let nan waste time 47 ret / %eax = 0 here 48.got_nan: 49 movl $1,%eax / %eax was 0, must be made 1 to 50 / indicate TRUE 51 ret 52 .align 4 53 SET_SIZE(isnanf) 54 55