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Annotation of 43BSD/usr.lib/libm/VAX/infnan.s, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1985 Regents of the University of California.
        !             3:  * 
        !             4:  * Use and reproduction of this software are granted  in  accordance  with
        !             5:  * the terms and conditions specified in  the  Berkeley  Software  License
        !             6:  * Agreement (in particular, this entails acknowledgement of the programs'
        !             7:  * source, and inclusion of this notice) with the additional understanding
        !             8:  * that  all  recipients  should regard themselves as participants  in  an
        !             9:  * ongoing  research  project and hence should  feel  obligated  to report
        !            10:  * their  experiences (good or bad) with these elementary function  codes,
        !            11:  * using "sendbug 4bsd-bugs@BERKELEY", to the authors.
        !            12:  *
        !            13:  * @(#)infnan.s        1.1 (Berkeley) 8/21/85
        !            14:  *
        !            15:  * infnan(arg) int arg;
        !            16:  * where arg :=    EDOM        if result is  NaN
        !            17:  *          :=  ERANGE if result is +INF
        !            18:  *          := -ERANGE if result is -INF
        !            19:  *
        !            20:  * The Reserved Operand Fault is generated inside of this routine.
        !            21:  *
        !            22:  */    
        !            23:        .globl  _infnan
        !            24:        .set    EDOM,33
        !            25:        .set    ERANGE,34
        !            26:        .text
        !            27:        .align 1
        !            28: _infnan:
        !            29:        .word   0x0
        !            30:        cmpl    4(ap),$ERANGE
        !            31:        bneq    1f
        !            32:        movl    $ERANGE,_errno
        !            33:        brb     2f
        !            34: 1:     movl    $EDOM,_errno
        !            35: 2:     emodd   $0,$0,$0x8000,r0,r0     # generates the reserved operand fault
        !            36:        ret

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