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Annotation of 43BSDReno/sys/tahoemath/FP.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *     @(#)FP.h        5.1 (Berkeley) 11/3/86
        !             3:  *
        !             4:  * General definitions of the floating point stuff on Power 6/32.
        !             5:  * The floating point format definition is:
        !             6:  *
        !             7:  *             S    (exp-128)
        !             8:  *         (-1)  * 2          * F
        !             9:  *
        !            10:  *     Where exp is the exponent field and F is the binary
        !            11:  *     mantissa following it, including the hidden bit.
        !            12:  *     The hidden bit actually is 1/2, so F is known to
        !            13:  *     satisfy the range:
        !            14:  *             1/2 <= F < 1
        !            15:  */
        !            16: 
        !            17: typedef struct {
        !            18:        unsigned        sign:1;
        !            19:        unsigned        exponent:8;
        !            20:        unsigned        mantissa:23;
        !            21: } sp_format;
        !            22: 
        !            23: typedef struct {
        !            24:        unsigned        sign:1;
        !            25:        unsigned        exponent:8;
        !            26:        unsigned        mantissa:23;
        !            27:        unsigned        mantissa_lst;
        !            28: } dp_format;
        !            29: 
        !            30: #define        EXP_BIAS        128             /* Exponent bias */
        !            31: #define SIGN_BIT       0x80000000      /* S bit mask */

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