65 lines
2.0 KiB
ArmAsm
65 lines
2.0 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 are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)floor.s 5.1 (Berkeley) 5/17/90
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*/
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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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