usr/src/lib/libc/tahoe/fpe/cmpf.s

/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Computer Consoles Inc.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(SYSLIBC_SCCS) && !defined(lint)
        .asciz "@(#)cmpf.s      1.2 (Berkeley) %G%"
#endif /* SYSLIBC_SCCS and not lint */

/*
 * cmpf(f1, f2)
 *      float f1, f2;
 * return -1, 0, 1 as f1 <, ==, > f2
 */
#include "DEFS.h"

XENTRY(cmpf, 0)
        cmpl    4(fp),12(fp)
        jneq    1f
        clrl    r0
        ret
1:
        movl    4(fp),r0
        jgeq    1f
        xorl2   $0x80000000,r0
        mnegl   r0,r0
1:
        movl    12(fp),r1
        jgeq    1f
        xorl2   $0x80000000,r1
        mnegl   r1,r1
1:
        cmpl    r0,r1
        jleq    1f
        movl    $1,r0
        ret
1:
        mnegl   $1,r0
        ret