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" 32 LIBM_ANSI_PRAGMA_WEAK(acosf,function) 33 #include "libm_synonyms.h" 34 #include "libm_protos.h" 35 36 #undef fabs 37 38 ENTRY(acosf) 39 flds 4(%esp) / push x 40 fld1 / push 1 41 fld %st(1) / x , 1 , x 42 fabs / |x| , 1 , x 43 fucomp 44 fstsw %ax 45 sahf 46 ja .ERR 47 fadd %st(1),%st / 1+x,x 48 fldz 49 fucomp 50 fstsw %ax 51 sahf 52 jp .L1 53 jne .L1 54 / x is -1 55 fstp %st(0) / x 56 fstp %st(0) / empty NPX stack 57 fldpi 58 ret 59 .L1: 60 fxch %st(1) / x,1+x 61 fld1 / 1,x,1+x 62 fsubp %st,%st(1) / 1-x,1+x 63 fdivp %st,%st(1) / (1-x)/(1+x) 64 fsqrt 65 fld1 / 1,sqrt((1-x)/(1+x)) 66 fpatan 67 fadd %st(0),%st 68 ret 69 70 .ERR: 71 / |x| > 1 72 fstp %st(0) / x 73 fstp %st(0) / empty NPX stack 74 fldz 75 fdiv %st(0),%st / 0/0 76 ret 77 .align 4 78 SET_SIZE(acosf)