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Annotation of cci/usr/include/FP.h, revision 1.1.1.1

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

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