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Annotation of 43BSD/usr.lib/libm/VAX/infnan.s, revision 1.1.1.1

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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