xref: /illumos-gate/usr/src/lib/libm/common/Q/isnanl.c (revision ddc0e0b5)
125c28e83SPiotr Jasiukajtis /*
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2125c28e83SPiotr Jasiukajtis 
2225c28e83SPiotr Jasiukajtis /*
2325c28e83SPiotr Jasiukajtis  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
2425c28e83SPiotr Jasiukajtis  */
2525c28e83SPiotr Jasiukajtis /*
2625c28e83SPiotr Jasiukajtis  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
2725c28e83SPiotr Jasiukajtis  * Use is subject to license terms.
2825c28e83SPiotr Jasiukajtis  */
2925c28e83SPiotr Jasiukajtis 
30*ddc0e0b5SRichard Lowe #pragma weak __isnanl = isnanl
3125c28e83SPiotr Jasiukajtis 
3225c28e83SPiotr Jasiukajtis #include "libm.h"
3325c28e83SPiotr Jasiukajtis 
3425c28e83SPiotr Jasiukajtis #if defined(__sparc)
3525c28e83SPiotr Jasiukajtis int
isnanl(long double x)3625c28e83SPiotr Jasiukajtis isnanl(long double x) {
3725c28e83SPiotr Jasiukajtis 	int *px = (int *) &x;
3825c28e83SPiotr Jasiukajtis 	return ((px[0] & ~0x80000000) >= 0x7fff0000 &&
3925c28e83SPiotr Jasiukajtis 		((px[0] & ~0xffff0000) | px[1] | px[2] | px[3]) != 0);
4025c28e83SPiotr Jasiukajtis }
4125c28e83SPiotr Jasiukajtis #elif defined(__x86)
4225c28e83SPiotr Jasiukajtis int
isnanl(long double x)4325c28e83SPiotr Jasiukajtis isnanl(long double x) {
4425c28e83SPiotr Jasiukajtis 	int *px = (int *) &x, t = px[2] & 0x7fff;
4525c28e83SPiotr Jasiukajtis #if defined(HANDLE_UNSUPPORTED)
4625c28e83SPiotr Jasiukajtis 	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0 ||
4725c28e83SPiotr Jasiukajtis 		t != 0 && (px[1] & 0x80000000) == 0);
4825c28e83SPiotr Jasiukajtis #else
4925c28e83SPiotr Jasiukajtis 	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0);
5025c28e83SPiotr Jasiukajtis #endif
5125c28e83SPiotr Jasiukajtis }
5225c28e83SPiotr Jasiukajtis #endif	/* defined(__sparc) || defined(__x86) */