1 #pragma once 2 #include <common/sys/types.h> 3 4 // ===== 描述long double 的数据比特结构 5 #if __LDBL_MANT_DIG__ == 53 && __LDBL_MAX_EXP__ == 1024 6 #elif __LDBL_MANT_DIG__ == 64 && __LDBL_MAX_EXP__ == 16384 && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 7 union ldshape 8 { 9 long double f; 10 struct 11 { 12 uint64_t m; 13 uint16_t se; 14 } i; 15 }; 16 #elif __LDBL_MANT_DIG__ == 113 && __LDBL_MAX_EXP__ == 16384 && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 17 union ldshape 18 { 19 long double f; 20 struct 21 { 22 uint64_t lo; 23 uint32_t mid; 24 uint16_t top; 25 uint16_t se; 26 } i; 27 struct 28 { 29 uint64_t lo; 30 uint64_t hi; 31 } i2; 32 }; 33 #elif __LDBL_MANT_DIG__ == 113 && __LDBL_MAX_EXP__ == 16384 && __BYTE_ORDER__ == __BIG_ENDIAN 34 union ldshape 35 { 36 long double f; 37 struct 38 { 39 uint16_t se; 40 uint16_t top; 41 uint32_t mid; 42 uint64_t lo; 43 } i; 44 struct 45 { 46 uint64_t hi; 47 uint64_t lo; 48 } i2; 49 }; 50 #else 51 #error Unsupported long double representation 52 #endif 53 54 #define FORCE_EVAL(x) \ 55 do \ 56 { \ 57 if (sizeof(x) == sizeof(float)) \ 58 { \ 59 volatile float __x; \ 60 __x = (x); \ 61 (void)__x; \ 62 } \ 63 else if (sizeof(x) == sizeof(double)) \ 64 { \ 65 volatile double __x; \ 66 __x = (x); \ 67 (void)__x; \ 68 } \ 69 else \ 70 { \ 71 volatile long double __x; \ 72 __x = (x); \ 73 (void)__x; \ 74 } \ 75 } while (0) 76