lib/gnu/ieee_float/ieee_float.h

   1 /*
   2 libc/ieee_float/ieee_float.h
   3
   4 Created:        Oct 14, 1993 by Philip Homburg <philip@cs.vu.nl>
   5
   6 Define structures and macros for manipulating IEEE floats
   7 */
   8
   9 #ifndef IEEE_FLOAT_H
  10 #define IEEE_FLOAT_H
  11
  12 #define isnan __IsNan
  13
  14 struct f64
  15 {
  16         u32_t low_word;
  17         u32_t high_word;
  18 };
  19
  20 #define F64_SIGN_SHIFT  31
  21 #define F64_SIGN_MASK   1
  22
  23 #define F64_EXP_SHIFT   20
  24 #define F64_EXP_MASK    0x7ff
  25 #define F64_EXP_BIAS    1023
  26 #define F64_EXP_MAX     2047
  27
  28 #define F64_MANT_SHIFT  0
  29 #define F64_MANT_MASK   0xfffff
  30
  31 #define F64_GET_SIGN(fp)        (((fp)->high_word >> F64_SIGN_SHIFT) & \
  32                                         F64_SIGN_MASK)
  33 #define F64_GET_EXP(fp)         (((fp)->high_word >> F64_EXP_SHIFT) & \
  34                                         F64_EXP_MASK)
  35 #define F64_SET_EXP(fp, val)    ((fp)->high_word= ((fp)->high_word &    \
  36                                 ~(F64_EXP_MASK << F64_EXP_SHIFT)) |     \
  37                                 (((val) & F64_EXP_MASK) << F64_EXP_SHIFT))
  38
  39 #define F64_GET_MANT_LOW(fp)            ((fp)->low_word)
  40 #define F64_SET_MANT_LOW(fp, val)       ((fp)->low_word= (val))
  41 #define F64_GET_MANT_HIGH(fp)   (((fp)->high_word >> F64_MANT_SHIFT) & \
  42                                         F64_MANT_MASK)
  43 #define F64_SET_MANT_HIGH(fp, val)      ((fp)->high_word= ((fp)->high_word & \
  44                                 ~(F64_MANT_MASK << F64_MANT_SHIFT)) |   \
  45                                 (((val) & F64_MANT_MASK) << F64_MANT_SHIFT))
  46
  47 #endif /* IEEE_FLOAT_H */
  48
  49 /*
  50  * $PchId: ieee_float.h,v 1.3 1996/02/22 21:01:39 philip Exp $
  51  */