84 lines
2.9 KiB
ArmAsm
84 lines
2.9 KiB
ArmAsm
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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.data
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.align 2
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;_sccsid:
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;.asciz "from: @(#)floor.s 5.1 (Berkeley) 5/17/90"
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_rcsid:
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.asciz "$Id: floor.s,v 1.1 1993/08/14 13:43:36 mycroft Exp $"
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.text
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.globl _floor,_ceil,_rint
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| floor(x)
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| the largest integer no larger than x
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_floor:
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fmovel fpcr,d0 | save old FPCR
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fmoved sp@(4),fp0 | get argument
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fbun Lret | if NaN, return NaN
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fboge Lrtz | >=0, round to zero
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fmovel #0x20,fpcr | <0, round to -inf
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jra Ldoit
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| ceil(x)
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| -floor(-x), for all real x
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_ceil:
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fmovel fpcr,d0 | save old FPCR
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fmoved sp@(4),fp0 | get argument
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fbun Lret | if NaN, return NaN
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fbolt Lrtz | <0, round to zero
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fmovel #0x30,fpcr | >=0, round to inf
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jra Ldoit
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Lrtz:
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fmovel #0x10,fpcr
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Ldoit:
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fintd sp@(4),fp0 | truncate
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fmovel d0,fpcr | restore old FPCR
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Lret:
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fmoved fp0,sp@-
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movel sp@+,d0
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movel sp@+,d1
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rts
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| rint(x)
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| delivers integer nearest x in direction of prevailing rounding mode
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_rint:
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fintd sp@(4),fp0 | use prevailing rounding mode
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jra Lret
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