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 /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ 28 /* Copyright (c) 1988 AT&T */ 29 /* All Rights Reserved */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #pragma weak _fpsetround = fpsetround 34 35 #include "lint.h" 36 #include <ieeefp.h> 37 #include "fp.h" 38 39 extern int _sse_hw; 40 extern void _getmxcsr(int *), _putmxcsr(int); 41 42 fp_rnd 43 fpsetround(fp_rnd newrnd) 44 { 45 struct _cw87 cw; 46 fp_rnd oldrnd; 47 int mxcsr; 48 extern int __flt_rounds; /* ANSI value for rounding */ 49 50 newrnd &= 0x3; /* mask off all ubt last 2 bits */ 51 switch (newrnd) { /* set ANSI rounding mode */ 52 case FP_RN: __flt_rounds = 1; 53 break; 54 case FP_RM: __flt_rounds = 3; 55 break; 56 case FP_RP: __flt_rounds = 2; 57 break; 58 case FP_RZ: __flt_rounds = 0; 59 break; 60 }; 61 _getcw(&cw); 62 oldrnd = (fp_rnd)cw.rnd; 63 cw.rnd = newrnd; 64 _putcw(cw); 65 if (_sse_hw) { 66 _getmxcsr(&mxcsr); 67 mxcsr = (mxcsr & ~0x6000) | ((int)newrnd << 13); 68 _putmxcsr(mxcsr); 69 } 70 return (oldrnd); 71 } 72