1 #ifndef __DD_HEADER 2 #define __DD_HEADER 3 4 #include "../int_lib.h" 5 6 typedef union { 7 long double ld; 8 struct { 9 double hi; 10 double lo; 11 }s; 12 }DD; 13 14 typedef union { 15 double d; 16 uint64_t x; 17 } doublebits; 18 19 #define LOWORDER(xy,xHi,xLo,yHi,yLo) \ 20 (((((xHi)*(yHi) - (xy)) + (xHi)*(yLo)) + (xLo)*(yHi)) + (xLo)*(yLo)) 21 22 static inline double __attribute__((always_inline)) 23 fabs(double x) 24 { 25 doublebits result = { .d = x }; 26 result.x &= UINT64_C(0x7fffffffffffffff); 27 return result.d; 28 } 29 30 static inline double __attribute__((always_inline)) 31 high26bits(double x) 32 { 33 doublebits result = { .d = x }; 34 result.x &= UINT64_C(0xfffffffff8000000); 35 return result.d; 36 } 37 38 static inline int __attribute__((always_inline)) 39 different_sign(double x, double y) 40 { 41 doublebits xsignbit = { .d = x }, ysignbit = { .d = y }; 42 int result = (int)(xsignbit.x >> 63) ^ (int)(ysignbit.x >> 63); 43 return result; 44 } 45 46 #endif /* __DD_HEADER */ 47
