1#ifndef __DD_HEADER 2#define __DD_HEADER 3 4#include "../int_lib.h" 5 6typedef union { 7 long double ld; 8 struct { 9 double hi; 10 double lo; 11 }s; 12}DD; 13 14typedef 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 22static inline double __attribute__((always_inline)) 23fabs(double x) 24{ 25 doublebits result = { .d = x }; 26 result.x &= UINT64_C(0x7fffffffffffffff); 27 return result.d; 28} 29 30static inline double __attribute__((always_inline)) 31high26bits(double x) 32{ 33 doublebits result = { .d = x }; 34 result.x &= UINT64_C(0xfffffffff8000000); 35 return result.d; 36} 37 38static inline int __attribute__((always_inline)) 39different_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