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 "acos.s" 30 31 #include "libm.h" 32 LIBM_ANSI_PRAGMA_WEAK(acos,function) 33 #include "libm_protos.h" 34 35 #undef fabs 36 37 ENTRY(acos) 38 fldl 4(%esp) / push x 39 fld1 / push 1 40 fld %st(1) / x , 1 , x 41 fabs / |x| , 1 , x 42 fucomp 43 fstsw %ax 44 sahf 45 ja .ERR 46 fadd %st(1),%st / 1+x,x 47 fldz 48 fucomp 49 fstsw %ax 50 sahf 51 jp .L1 52 jne .L1 53 / x is -1 54 fstp %st(0) / -1 55 fstp %st(0) / empty NPX stack 56 fldpi 57 ret 58 .L1: 59 fxch %st(1) / x,1+x 60 fld1 / 1,x,1+x 61 fsubp %st,%st(1) / 1-x,1+x 62 fdivp %st,%st(1) / (1-x)/(1+x) 63 fsqrt 64 fld1 / 1,sqrt((1-x)/(1+x)) 65 fpatan 66 fadd %st(0),%st 67 ret 68 69 .ERR: 70 / |x| > 1 71 pushl %ebp 72 movl %esp,%ebp 73 PIC_SETUP(1) 74 fstp %st(0) / x 75 fstp %st(0) / empty NPX stack 76 pushl $1 77 pushl 12(%ebp) / high x 78 pushl 8(%ebp) / low x 79 pushl 12(%ebp) / high x 80 pushl 8(%ebp) / low x 81 call PIC_F(_SVID_libm_err) / report SVID result/error 82 addl $20,%esp 83 PIC_WRAPUP 84 leave 85 ret 86 .align 4 87 SET_SIZE(acos)