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Annotation of 43BSDReno/lib/libc/vax/gen/frexp.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21:        .asciz "@(#)frexp.s     5.6 (Berkeley) 6/1/90"
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: /* C library -- frexp(value, eptr) */
                     25: 
                     26: #include "DEFS.h"
                     27: 
                     28: ENTRY(frexp, 0)
                     29:        movd    4(ap),r0                # (r0,r1) := value
                     30:        extzv   $7,$8,r0,*12(ap)        # Fetch exponent
                     31:        jeql    1f                      # If exponent zero, we're done
                     32:        subl2   $128,*12(ap)            # Bias the exponent appropriately
                     33:        insv    $128,$7,$8,r0           # Force result exponent to biased 0
                     34: 1:
                     35:        ret

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