usr/src/lib/libm/vax/infnan.s

/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 * All recipients should regard themselves as participants in an ongoing
 * research project and hence should feel obligated to report their
 * experiences (good or bad) with these elementary function codes, using
 * the sendbug(8) program, to the authors.
 *
 *      @(#)infnan.s    5.4 (Berkeley) %G%
 */
        .data
        .align  2
_sccsid:
.asciz  "@(#)infnan.s   1.1 (Berkeley) 8/21/85; 5.4 (ucb.elefunt) %G%"

/*
 * infnan(arg) int arg;
 * where arg :=    EDOM if result is  NaN
 *           :=  ERANGE if result is +INF
 *           := -ERANGE if result is -INF
 *
 * The Reserved Operand Fault is generated inside of this routine.
 */
        .globl  _infnan
        .set    EDOM,33
        .set    ERANGE,34
        .text
        .align 1
_infnan:
        .word   0x0
        cmpl    4(ap),$ERANGE
        bneq    1f
        movl    $ERANGE,_errno
        brb     2f
1:      movl    $EDOM,_errno
2:      emodd   $0,$0,$0x8000,r0,r0     # generates the reserved operand fault
        ret