sysdeps/x86_64/fpu/math_ldbl.h

   1 #ifndef _MATH_PRIVATE_H_
   2 #error "Never use <math_ldbl.h> directly; include <math_private.h> instead."
   3 #endif
   4
   5 /* A union which permits us to convert between a long double and
   6    three 32 bit ints.  */
   7
   8 typedef union
   9 {
  10   long double value;
  11   struct
  12   {
  13     u_int32_t lsw;
  14     u_int32_t msw;
  15     int sign_exponent:16;
  16     unsigned int empty1:16;
  17     unsigned int empty0:32;
  18   } parts;
  19 } ieee_long_double_shape_type;
  20
  21 /* Get three 32 bit ints from a double.  */
  22
  23 #define GET_LDOUBLE_WORDS(exp,ix0,ix1,d)                        \
  24 do {                                                            \
  25   ieee_long_double_shape_type ew_u;                             \
  26   ew_u.value = (d);                                             \
  27   (exp) = ew_u.parts.sign_exponent;                             \
  28   (ix0) = ew_u.parts.msw;                                       \
  29   (ix1) = ew_u.parts.lsw;                                       \
  30 } while (0)
  31
  32 /* Set a double from two 32 bit ints.  */
  33
  34 #define SET_LDOUBLE_WORDS(d,exp,ix0,ix1)                        \
  35 do {                                                            \
  36   ieee_long_double_shape_type iw_u;                             \
  37   iw_u.parts.sign_exponent = (exp);                             \
  38   iw_u.parts.msw = (ix0);                                       \
  39   iw_u.parts.lsw = (ix1);                                       \
  40   (d) = iw_u.value;                                             \
  41 } while (0)
  42
  43 /* Get the more significant 32 bits of a long double mantissa.  */
  44
  45 #define GET_LDOUBLE_MSW(v,d)                                    \
  46 do {                                                            \
  47   ieee_long_double_shape_type sh_u;                             \
  48   sh_u.value = (d);                                             \
  49   (v) = sh_u.parts.msw;                                         \
  50 } while (0)
  51
  52 /* Set the more significant 32 bits of a long double mantissa from an int.  */
  53
  54 #define SET_LDOUBLE_MSW(d,v)                                    \
  55 do {                                                            \
  56   ieee_long_double_shape_type sh_u;                             \
  57   sh_u.value = (d);                                             \
  58   sh_u.parts.msw = (v);                                         \
  59   (d) = sh_u.value;                                             \
  60 } while (0)
  61
  62 /* Get int from the exponent of a long double.  */
  63
  64 #define GET_LDOUBLE_EXP(exp,d)                                  \
  65 do {                                                            \
  66   ieee_long_double_shape_type ge_u;                             \
  67   ge_u.value = (d);                                             \
  68   (exp) = ge_u.parts.sign_exponent;                             \
  69 } while (0)
  70
  71 /* Set exponent of a long double from an int.  */
  72
  73 #define SET_LDOUBLE_EXP(d,exp)                                  \
  74 do {                                                            \
  75   ieee_long_double_shape_type se_u;                             \
  76   se_u.value = (d);                                             \
  77   se_u.parts.sign_exponent = (exp);                             \
  78   (d) = se_u.value;                                             \
  79 } while (0)