1/* $NetBSD: systmodes.S,v 1.3 2001/03/22 12:05:36 ross Exp $ */ 2 3/* This is a derivative work. */ 4 5/*- 6 * Copyright (c) 2001 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Ross Harvey. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41/* 42=============================================================================== 43 44This GNU assembler source file is part of TestFloat, Release 2a, a package 45of programs for testing the correctness of floating-point arithmetic 46complying to the IEC/IEEE Standard for Floating-Point. 47 48Written by John R. Hauser. More information is available through the Web 49page `http://HTTP.CS.Berkeley.EDU/~jhauser/arithmetic/TestFloat.html'. 50 51THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 52has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 53TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 54PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 55AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 56 57Derivative works are acceptable, even for commercial purposes, so long as 58(1) they include prominent notice that the work is derivative, and (2) they 59include prominent notice akin to these four paragraphs for those parts of 60this code that are retained. 61 62=============================================================================== 63*/ 64 65 .text 66 67#include <machine/asm.h> 68 69/* 70------------------------------------------------------------------------------- 71Sets the rounding precision of subsequent extended double-precision 72operations. The `precision' argument should be one of 0, 32, 64, or 80. 73If `precision' is 32, the rounding precision is set equivalent to single 74precision; else if `precision' is 64, the rounding precision is set 75equivalent to double precision; else the rounding precision is set to full 76extended double precision. 77------------------------------------------------------------------------------- 78*/ 79 80ENTRY(syst_float_set_rounding_precision) 81 movb 4(%esp),%al 82 movb $0,%ah 83 cmpb $32,%al 84 je setRoundingPrecision 85 movb $2,%ah 86 cmpb $64,%al 87 je setRoundingPrecision 88 movb $3,%ah 89 cmpb $80,%al 90 je setRoundingPrecision 91 movb $0,%ah 92setRoundingPrecision: 93 movb $0,%al 94 subl $2,%esp 95 fnstcw 0(%esp) 96 andw $64767,0(%esp) 97 orw %ax,0(%esp) 98 fldcw 0(%esp) 99 addl $2,%esp 100 ret 101 102