/* * copysignf.c * cLibm * * Created by Ian Ollmann on 6/13/07. * Copyright 2007 Apple Inc. All rights reserved. * */ #include <math.h> #include <stdint.h> double copysign( double x, double y ) { union{ double f; uint64_t u; }ux, uy; ux.f = x; uy.f = y; ux.u &= 0x7fffffffffffffffULL; ux.u |= uy.u & 0x8000000000000000ULL; return ux.f; }