projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d5efd131 MF |
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 | #if __FLOAT_WORD_ORDER == BIG_ENDIAN | |
| 9 | ||
| 10 | typedef union | |
| 11 | { | |
| 12 | long double value; | |
| 13 | struct | |
| 14 | { | |
| 15 | unsigned int empty0:32; | |
| 16 | int sign_exponent:16; | |
| 17 | unsigned int empty1:16; | |
| 18 | u_int32_t msw; | |
| 19 | u_int32_t lsw; | |
| 20 | } parts; | |
| 21 | } ieee_long_double_shape_type; | |
| 22 | ||
| 23 | #endif | |
| 24 | ||
| 25 | #if __FLOAT_WORD_ORDER == LITTLE_ENDIAN | |
| 26 | ||
| 27 | typedef union | |
| 28 | { | |
| 29 | long double value; | |
| 30 | struct | |
| 31 | { | |
| 32 | u_int32_t lsw; | |
| 33 | u_int32_t msw; | |
| 34 | int sign_exponent:16; | |
| 35 | unsigned int empty1:16; | |
| 36 | unsigned int empty0:32; | |
| 37 | } parts; | |
| 38 | } ieee_long_double_shape_type; | |
| 39 | ||
| 40 | #endif | |
| 41 | ||
| 42 | /* Get three 32 bit ints from a double. */ | |
| 43 | ||
| 44 | #define GET_LDOUBLE_WORDS(exp,ix0,ix1,d) \ | |
| 45 | do { \ | |
| 46 | ieee_long_double_shape_type ew_u; \ | |
| 47 | ew_u.value = (d); \ | |
| 48 | (exp) = ew_u.parts.sign_exponent; \ | |
| 49 | (ix0) = ew_u.parts.msw; \ | |
| 50 | (ix1) = ew_u.parts.lsw; \ | |
| 51 | } while (0) | |
| 52 | ||
| 53 | /* Set a double from two 32 bit ints. */ | |
| 54 | ||
| 55 | #define SET_LDOUBLE_WORDS(d,exp,ix0,ix1) \ | |
| 56 | do { \ | |
| 57 | ieee_long_double_shape_type iw_u; \ | |
| 58 | iw_u.parts.sign_exponent = (exp); \ | |
| 59 | iw_u.parts.msw = (ix0); \ | |
| 60 | iw_u.parts.lsw = (ix1); \ | |
| 61 | (d) = iw_u.value; \ | |
| 62 | } while (0) | |
| 63 | ||
| 64 | /* Get the more significant 32 bits of a long double mantissa. */ | |
| 65 | ||
| 66 | #define GET_LDOUBLE_MSW(v,d) \ | |
| 67 | do { \ | |
| 68 | ieee_long_double_shape_type sh_u; \ | |
| 69 | sh_u.value = (d); \ | |
| 70 | (v) = sh_u.parts.msw; \ | |
| 71 | } while (0) | |
| 72 | ||
| 73 | /* Set the more significant 32 bits of a long double mantissa from an int. */ | |
| 74 | ||
| 75 | #define SET_LDOUBLE_MSW(d,v) \ | |
| 76 | do { \ | |
| 77 | ieee_long_double_shape_type sh_u; \ | |
| 78 | sh_u.value = (d); \ | |
| 79 | sh_u.parts.msw = (v); \ | |
| 80 | (d) = sh_u.value; \ | |
| 81 | } while (0) | |
| 82 | ||
| 83 | /* Get int from the exponent of a long double. */ | |
| 84 | ||
| 85 | #define GET_LDOUBLE_EXP(exp,d) \ | |
| 86 | do { \ | |
| 87 | ieee_long_double_shape_type ge_u; \ | |
| 88 | ge_u.value = (d); \ | |
| 89 | (exp) = ge_u.parts.sign_exponent; \ | |
| 90 | } while (0) | |
| 91 | ||
| 92 | /* Set exponent of a long double from an int. */ | |
| 93 | ||
| 94 | #define SET_LDOUBLE_EXP(d,exp) \ | |
| 95 | do { \ | |
| 96 | ieee_long_double_shape_type se_u; \ | |
| 97 | se_u.value = (d); \ | |
| 98 | se_u.parts.sign_exponent = (exp); \ | |
| 99 | (d) = se_u.value; \ | |
| 100 | } while (0) |