17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7257d1b4Sraf * Common Development and Distribution License (the "License"). 6*7257d1b4Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 21*7257d1b4Sraf 227c478bd9Sstevel@tonic-gate /* 23*7257d1b4Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 27*7257d1b4Sraf #include "lint.h" 287c478bd9Sstevel@tonic-gate #include <sys/ieeefp.h> 297c478bd9Sstevel@tonic-gate #include <ieeefp.h> 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate static const double zero = 0.0, tiny = 1.0e-307, tiny2 = 1.001e-307, 327c478bd9Sstevel@tonic-gate huge = 1.0e300; 337c478bd9Sstevel@tonic-gate 347c478bd9Sstevel@tonic-gate /* 357c478bd9Sstevel@tonic-gate * _Q_set_exception(ex) simulates the floating point exceptions indicated by 367c478bd9Sstevel@tonic-gate * ex. This routine is not used by the new quad emulation routines but is 377c478bd9Sstevel@tonic-gate * still used by ../crt/_ftoll.c. 387c478bd9Sstevel@tonic-gate */ 397c478bd9Sstevel@tonic-gate int _Q_set_exception(unsigned int ex)407c478bd9Sstevel@tonic-gate_Q_set_exception(unsigned int ex) 417c478bd9Sstevel@tonic-gate { 427c478bd9Sstevel@tonic-gate /* LINTED set but not used */ 437c478bd9Sstevel@tonic-gate volatile double t; 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate if (ex == 0) 467c478bd9Sstevel@tonic-gate t = zero - zero; /* clear cexc */ 477c478bd9Sstevel@tonic-gate else { 487c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_invalid)) != 0) 497c478bd9Sstevel@tonic-gate t = zero / zero; 507c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_overflow)) != 0) 517c478bd9Sstevel@tonic-gate t = huge * huge; 527c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_underflow)) != 0) { 537c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_inexact)) != 0 || 547c478bd9Sstevel@tonic-gate (fpgetmask() & FP_X_UFL) != 0) 557c478bd9Sstevel@tonic-gate t = tiny * tiny; 567c478bd9Sstevel@tonic-gate else 577c478bd9Sstevel@tonic-gate t = tiny2 - tiny; /* exact */ 587c478bd9Sstevel@tonic-gate } 597c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_division)) != 0) 607c478bd9Sstevel@tonic-gate t = tiny / zero; 617c478bd9Sstevel@tonic-gate if ((ex & (1 << fp_inexact)) != 0) 627c478bd9Sstevel@tonic-gate t = huge + tiny; 637c478bd9Sstevel@tonic-gate } 647c478bd9Sstevel@tonic-gate return (0); 657c478bd9Sstevel@tonic-gate } 66