10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*6812Sraf * Common Development and Distribution License (the "License"). 6*6812Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 21*6812Sraf 22*6812Sraf /* 23*6812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24*6812Sraf * Use is subject to license terms. 25*6812Sraf */ 26*6812Sraf 270Sstevel@tonic-gate /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ 280Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */ 290Sstevel@tonic-gate /* All Rights Reserved */ 300Sstevel@tonic-gate 310Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 320Sstevel@tonic-gate 33*6812Sraf #pragma weak _fpsetround = fpsetround 340Sstevel@tonic-gate 35*6812Sraf #include "lint.h" 360Sstevel@tonic-gate #include <ieeefp.h> 370Sstevel@tonic-gate #include "fp.h" 380Sstevel@tonic-gate 390Sstevel@tonic-gate extern int _sse_hw; 400Sstevel@tonic-gate extern void _getmxcsr(int *), _putmxcsr(int); 410Sstevel@tonic-gate 420Sstevel@tonic-gate fp_rnd fpsetround(fp_rnd newrnd)430Sstevel@tonic-gatefpsetround(fp_rnd newrnd) 440Sstevel@tonic-gate { 450Sstevel@tonic-gate struct _cw87 cw; 460Sstevel@tonic-gate fp_rnd oldrnd; 470Sstevel@tonic-gate int mxcsr; 480Sstevel@tonic-gate extern int __flt_rounds; /* ANSI value for rounding */ 490Sstevel@tonic-gate 500Sstevel@tonic-gate newrnd &= 0x3; /* mask off all ubt last 2 bits */ 510Sstevel@tonic-gate switch (newrnd) { /* set ANSI rounding mode */ 520Sstevel@tonic-gate case FP_RN: __flt_rounds = 1; 530Sstevel@tonic-gate break; 540Sstevel@tonic-gate case FP_RM: __flt_rounds = 3; 550Sstevel@tonic-gate break; 560Sstevel@tonic-gate case FP_RP: __flt_rounds = 2; 570Sstevel@tonic-gate break; 580Sstevel@tonic-gate case FP_RZ: __flt_rounds = 0; 590Sstevel@tonic-gate break; 600Sstevel@tonic-gate }; 610Sstevel@tonic-gate _getcw(&cw); 620Sstevel@tonic-gate oldrnd = (fp_rnd)cw.rnd; 630Sstevel@tonic-gate cw.rnd = newrnd; 640Sstevel@tonic-gate _putcw(cw); 650Sstevel@tonic-gate if (_sse_hw) { 660Sstevel@tonic-gate _getmxcsr(&mxcsr); 670Sstevel@tonic-gate mxcsr = (mxcsr & ~0x6000) | ((int)newrnd << 13); 680Sstevel@tonic-gate _putmxcsr(mxcsr); 690Sstevel@tonic-gate } 700Sstevel@tonic-gate return (oldrnd); 710Sstevel@tonic-gate } 72