Return to FP.h CVS log

Up to [CSRG BSD Unix] / 43BSDReno / sys / tahoemath

Annotation of 43BSDReno/sys/tahoemath/FP.h, revision 1.1.1.1

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 */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.