Plan 9 from Bell Labs’s /usr/web/sources/patch/maybe/ape-updates/copysign.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#include <math.h>
#include <errno.h>
#define _RESEARCH_SOURCE
#include <float.h>

#define SIGN	(1<<31)

double
copysign(double x, double y)
{
	FPdbleword a, b;

	a.x = x;
	b.x = y;
	a.hi &= ~SIGN;
	a.hi |= b.hi & SIGN;
	return a.x;
}

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