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Annotation of 43BSDTahoe/lib/libc/gen/gen.vax/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19:        .asciz "@(#)frexp.s     5.5 (Berkeley) 6/27/88"
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: /* C library -- frexp(value, eptr) */
                     23: 
                     24: #include "DEFS.h"
                     25: 
                     26: ENTRY(frexp, 0)
                     27:        movd    4(ap),r0                # (r0,r1) := value
                     28:        extzv   $7,$8,r0,*12(ap)        # Fetch exponent
                     29:        jeql    1f                      # If exponent zero, we're done
                     30:        subl2   $128,*12(ap)            # Bias the exponent appropriately
                     31:        insv    $128,$7,$8,r0           # Force result exponent to biased 0
                     32: 1:
                     33:        ret

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