usr/src/lib/libc/vax/gen/frexp.s

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
        .asciz "@(#)frexp.s     5.6 (Berkeley) %G%"
#endif /* LIBC_SCCS and not lint */

/* C library -- frexp(value, eptr) */

#include "DEFS.h"

ENTRY(frexp, 0)
        movd    4(ap),r0                # (r0,r1) := value
        extzv   $7,$8,r0,*12(ap)        # Fetch exponent
        jeql    1f                      # If exponent zero, we're done
        subl2   $128,*12(ap)            # Bias the exponent appropriately
        insv    $128,$7,$8,r0           # Force result exponent to biased 0
1:
        ret