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 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "lint.h" 30 #include <sys/ieeefp.h> 31 #include <ieeefp.h> 32 33 static const double zero = 0.0, tiny = 1.0e-307, tiny2 = 1.001e-307, 34 huge = 1.0e300; 35 36 /* 37 * _Q_set_exception(ex) simulates the floating point exceptions indicated by 38 * ex. This routine is not used by the new quad emulation routines but is 39 * still used by ../crt/_ftoll.c. 40 */ 41 int 42 _Q_set_exception(unsigned int ex) 43 { 44 /* LINTED set but not used */ 45 volatile double t; 46 47 if (ex == 0) 48 t = zero - zero; /* clear cexc */ 49 else { 50 if ((ex & (1 << fp_invalid)) != 0) 51 t = zero / zero; 52 if ((ex & (1 << fp_overflow)) != 0) 53 t = huge * huge; 54 if ((ex & (1 << fp_underflow)) != 0) { 55 if ((ex & (1 << fp_inexact)) != 0 || 56 (fpgetmask() & FP_X_UFL) != 0) 57 t = tiny * tiny; 58 else 59 t = tiny2 - tiny; /* exact */ 60 } 61 if ((ex & (1 << fp_division)) != 0) 62 t = tiny / zero; 63 if ((ex & (1 << fp_inexact)) != 0) 64 t = huge + tiny; 65 } 66 return (0); 67 } 68