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

/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)infnan.s    5.5 (Berkeley) 10/9/90
 */
        .data
        .align  2
_sccsid:
.asciz  "@(#)infnan.s   1.1 (Berkeley) 8/21/85; 5.5 (ucb.elefunt) 10/9/90"

/*
 * 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