9 lines
174 B
C
9 lines
174 B
C
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#include "libc/math/libm.h"
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double copysign(double x, double y) {
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union {double f; uint64_t i;} ux={x}, uy={y};
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ux.i &= -1ULL/2;
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ux.i |= uy.i & 1ULL<<63;
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return ux.f;
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}
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