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Annotation of 43BSDReno/lib/libm/mc68881/floor.s, revision 1.1.1.1

1.1       root        1: /*-
                      2:  * Copyright (c) 1990 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * the Systems Programming Group of the University of Utah Computer
                      7:  * Science Department.
                      8:  *
                      9:  * Redistribution and use in source and binary forms are permitted
                     10:  * provided that: (1) source distributions retain this entire copyright
                     11:  * notice and comment, and (2) distributions including binaries display
                     12:  * the following acknowledgement:  ``This product includes software
                     13:  * developed by the University of California, Berkeley and its contributors''
                     14:  * in the documentation or other materials provided with the distribution
                     15:  * and in all advertising materials mentioning features or use of this
                     16:  * software. Neither the name of the University nor the names of its
                     17:  * contributors may be used to endorse or promote products derived
                     18:  * from this software without specific prior written permission.
                     19:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     21:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     22:  *
                     23:  *     @(#)floor.s     5.1 (Berkeley) 5/17/90
                     24:  */
                     25: 
                     26:        .text
                     27:        .globl  _floor,_ceil,_rint
                     28: 
                     29: | floor(x)
                     30: | the largest integer no larger than x
                     31: _floor:
                     32:        fmovel  fpcr,d0         | save old FPCR
                     33:        fmoved  sp@(4),fp0      | get argument
                     34:        fbun    Lret            | if NaN, return NaN
                     35:        fboge   Lrtz            | >=0, round to zero
                     36:        fmovel  #0x20,fpcr      | <0, round to -inf
                     37:        jra     Ldoit
                     38: 
                     39: | ceil(x)
                     40: | -floor(-x), for all real x
                     41: _ceil:
                     42:        fmovel  fpcr,d0         | save old FPCR
                     43:        fmoved  sp@(4),fp0      | get argument
                     44:        fbun    Lret            | if NaN, return NaN
                     45:        fbolt   Lrtz            | <0, round to zero
                     46:        fmovel  #0x30,fpcr      | >=0, round to inf
                     47:        jra     Ldoit
                     48: 
                     49: Lrtz:
                     50:        fmovel  #0x10,fpcr
                     51: Ldoit:
                     52:        fintd   sp@(4),fp0      | truncate
                     53:        fmovel  d0,fpcr         | restore old FPCR
                     54: Lret:
                     55:        fmoved  fp0,sp@-
                     56:        movel   sp@+,d0
                     57:        movel   sp@+,d1
                     58:        rts
                     59: 
                     60: | rint(x)
                     61: | delivers integer nearest x in direction of prevailing rounding mode
                     62: _rint:
                     63:        fintd   sp@(4),fp0      | use prevailing rounding mode
                     64:        jra     Lret

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