47 lines
903 B
C
47 lines
903 B
C
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#ifndef __DD_HEADER
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#define __DD_HEADER
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#include "../int_lib.h"
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typedef union {
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long double ld;
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struct {
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double hi;
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double lo;
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}s;
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}DD;
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typedef union {
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double d;
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uint64_t x;
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} doublebits;
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#define LOWORDER(xy,xHi,xLo,yHi,yLo) \
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(((((xHi)*(yHi) - (xy)) + (xHi)*(yLo)) + (xLo)*(yHi)) + (xLo)*(yLo))
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static inline double __attribute__((always_inline))
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fabs(double x)
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{
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doublebits result = { .d = x };
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result.x &= UINT64_C(0x7fffffffffffffff);
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return result.d;
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}
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static inline double __attribute__((always_inline))
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high26bits(double x)
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{
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doublebits result = { .d = x };
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result.x &= UINT64_C(0xfffffffff8000000);
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return result.d;
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}
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static inline int __attribute__((always_inline))
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different_sign(double x, double y)
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{
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doublebits xsignbit = { .d = x }, ysignbit = { .d = y };
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int result = (int)(xsignbit.x >> 63) ^ (int)(ysignbit.x >> 63);
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return result;
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}
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#endif /* __DD_HEADER */
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