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Annotation of 43BSDTahoe/usr.lib/libm/tahoe/infnan.s, revision 1.1

1.1     ! root        1: # Copyright (c) 1985 Regents of the University of California.
        !             2: # All rights reserved.
        !             3: #
        !             4: # Redistribution and use in source and binary forms are permitted
        !             5: # provided that the above copyright notice and this paragraph are
        !             6: # duplicated in all such forms and that any documentation,
        !             7: # advertising materials, and other materials related to such
        !             8: # distribution and use acknowledge that the software was developed
        !             9: # by the University of California, Berkeley.  The name of the
        !            10: # University may not be used to endorse or promote products derived
        !            11: # from this software without specific prior written permission.
        !            12: # THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            13: # IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            14: # WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            15: #
        !            16: # All recipients should regard themselves as participants in an ongoing
        !            17: # research project and hence should feel obligated to report their
        !            18: # experiences (good or bad) with these elementary function codes, using
        !            19: # the sendbug(8) program, to the authors.
        !            20: #
        !            21: #      @(#)infnan.s    5.4 (Berkeley) 6/30/88
        !            22: #
        !            23:        .data
        !            24:        .align  2
        !            25: _sccsid:
        !            26: .asciz "@(#)infnan.s   5.4     (ucb.elefunt)   6/30/88"
        !            27: 
        !            28: /*
        !            29:  * double infnan(arg)
        !            30:  * int arg;
        !            31:  * where arg :=    EDOM        if result is  NaN
        !            32:  *          :=  ERANGE if result is +INF
        !            33:  *          := -ERANGE if result is -INF
        !            34:  *
        !            35:  * The Reserved Operand Fault is generated inside of this routine.
        !            36:  */    
        !            37:        .globl  _infnan
        !            38:        .set    EDOM,33
        !            39:        .set    ERANGE,34
        !            40:        .text
        !            41:        .align 2
        !            42: _infnan:
        !            43:        .word   0x0000                  # save nothing
        !            44:        cmpl    4(fp),$ERANGE
        !            45:        bneq    1f
        !            46:        movl    $ERANGE,_errno
        !            47:        brb     2f
        !            48: 1:     movl    $EDOM,_errno
        !            49: 2:     cmpf2   $0x80000000,$0x80000000 # generates the reserved operand fault
        !            50:        ret

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