glibc/sysdeps/ieee754/ldbl-128ibm/s_fabsl.c

/* s_fabsl.c -- long double version of s_fabs.c.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif


/*
 * fabsl(x) returns the absolute value of x.
 */

#include <math.h>
#include <math_private.h>
#include <math_ldbl_opt.h>
#include <math-use-builtins.h>

long double __fabsl(long double x)
{
#if USE_FABSL_BUILTIN
	return __builtin_fabsl (x);
#else
	uint64_t hx, lx;
	double xhi, xlo;

	ldbl_unpack (x, &xhi, &xlo);
	EXTRACT_WORDS64 (hx, xhi);
	EXTRACT_WORDS64 (lx, xlo);
	lx = lx ^ ( hx & 0x8000000000000000LL );
	hx = hx & 0x7fffffffffffffffLL;
	INSERT_WORDS64 (xhi, hx);
	INSERT_WORDS64 (xlo, lx);
	x = ldbl_pack (xhi, xlo);
	return x;
#endif
}
long_double_symbol (libm, __fabsl, fabsl);