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 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 .file "acosf.s" 30 31#include "libm.h" 32LIBM_ANSI_PRAGMA_WEAK(acosf,function) 33#include "libm_protos.h" 34 35 ENTRY(acosf) 36 flds 4(%esp) / push x 37 fld1 / push 1 38 fld %st(1) / x , 1 , x 39 fabs / |x| , 1 , x 40 fucomp 41 fstsw %ax 42 sahf 43 ja .ERR 44 fadd %st(1),%st / 1+x,x 45 fldz 46 fucomp 47 fstsw %ax 48 sahf 49 jp .L1 50 jne .L1 51 / x is -1 52 fstp %st(0) / x 53 fstp %st(0) / empty NPX stack 54 fldpi 55 ret 56.L1: 57 fxch %st(1) / x,1+x 58 fld1 / 1,x,1+x 59 fsubp %st,%st(1) / 1-x,1+x 60 fdivp %st,%st(1) / (1-x)/(1+x) 61 fsqrt 62 fld1 / 1,sqrt((1-x)/(1+x)) 63 fpatan 64 fadd %st(0),%st 65 ret 66 67.ERR: 68 / |x| > 1 69 fstp %st(0) / x 70 fstp %st(0) / empty NPX stack 71 fldz 72 fdiv %st(0),%st / 0/0 73 ret 74 .align 4 75 SET_SIZE(acosf) 76