1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate #include "synonyms.h" 30*7c478bd9Sstevel@tonic-gate #include <sys/ieeefp.h> 31*7c478bd9Sstevel@tonic-gate #include <ieeefp.h> 32*7c478bd9Sstevel@tonic-gate 33*7c478bd9Sstevel@tonic-gate static const double zero = 0.0, tiny = 1.0e-307, tiny2 = 1.001e-307, 34*7c478bd9Sstevel@tonic-gate huge = 1.0e300; 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate /* 37*7c478bd9Sstevel@tonic-gate * _Q_set_exception(ex) simulates the floating point exceptions indicated by 38*7c478bd9Sstevel@tonic-gate * ex. This routine is not used by the new quad emulation routines but is 39*7c478bd9Sstevel@tonic-gate * still used by ../crt/_ftoll.c. 40*7c478bd9Sstevel@tonic-gate */ 41*7c478bd9Sstevel@tonic-gate int 42*7c478bd9Sstevel@tonic-gate _Q_set_exception(unsigned int ex) 43*7c478bd9Sstevel@tonic-gate { 44*7c478bd9Sstevel@tonic-gate /* LINTED set but not used */ 45*7c478bd9Sstevel@tonic-gate volatile double t; 46*7c478bd9Sstevel@tonic-gate 47*7c478bd9Sstevel@tonic-gate if (ex == 0) 48*7c478bd9Sstevel@tonic-gate t = zero - zero; /* clear cexc */ 49*7c478bd9Sstevel@tonic-gate else { 50*7c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_invalid)) != 0) 51*7c478bd9Sstevel@tonic-gate t = zero / zero; 52*7c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_overflow)) != 0) 53*7c478bd9Sstevel@tonic-gate t = huge * huge; 54*7c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_underflow)) != 0) { 55*7c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_inexact)) != 0 || 56*7c478bd9Sstevel@tonic-gate (fpgetmask() & FP_X_UFL) != 0) 57*7c478bd9Sstevel@tonic-gate t = tiny * tiny; 58*7c478bd9Sstevel@tonic-gate else 59*7c478bd9Sstevel@tonic-gate t = tiny2 - tiny; /* exact */ 60*7c478bd9Sstevel@tonic-gate } 61*7c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_division)) != 0) 62*7c478bd9Sstevel@tonic-gate t = tiny / zero; 63*7c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_inexact)) != 0) 64*7c478bd9Sstevel@tonic-gate t = huge + tiny; 65*7c478bd9Sstevel@tonic-gate } 66*7c478bd9Sstevel@tonic-gate return (0); 67*7c478bd9Sstevel@tonic-gate } 68