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Annotation of 43BSDTahoe/usr.lib/libm/tahoe/infnan.s, revision 1.1.1.1

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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