FPREG

Coprocessor stack register element.

Type
ULONG losig ULONG hisig USHORT signexp

C Declaration Method
typedef struct

Fields

 * losig:Low 32-bits of the significand.
 * The low 32-bits of the number's significant digits are held in the lower part of the significand field.


 * hisig:High 32-bits of the significand.
 * The high 32-bits of the number's significant digits are held in the higher part of the significand field.


 * signexp:Sign and exponent.
 * The exponent field (bits 64-78) locates the binary point within the significand field (bits 0-63).
 * The 1-bit sign field (bit 79) indicates whether the number is positive or negative.

Comment
A floating point register is 80 bits wide and consists of three fields. The following graphic shows the layout of the floating point register: 79 78         64 63                                     0 ┌───┬────────────┬───────────────────────────────────────┐ │   │            │             Significand               │ └─┬─┴──────┬─────┴───────────────────────────────────────┘  │        │   │        Exponent Sign