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Optimized isnan for 64-bit machines.

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Ulrich Drepper 2009-08-26 00:12:58 -07:00
parent deb13bcda9
commit 15e7f0a44d
2 changed files with 43 additions and 0 deletions
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ChangeLog
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2009-08-26 Ulrich Drepper <drepper@redhat.com>
* sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c: New file.
2009-08-25 Ulrich Drepper <drepper@redhat.com>
* sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c: Add llround aliases.

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sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c Normal file
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/* @(#)s_isnan.c 5.1 93/09/24 */
/*
* ====================================================
* 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.
* ====================================================
*/
/*
* isnan(x) returns 1 is x is nan, else 0;
* no branching!
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
int __isnan(double x)
#else
int __isnan(x)
double x;
#endif
{
int64_t hx;
EXTRACT_WORDS64(hx,x);
hx &= UINT64_C(0x7fffffffffffffff);
hx = UINT64_C(0x7ff0000000000000) - hx;
return (int)(((uint64_t)hx)>>63);
}
hidden_def (__isnan)
weak_alias (__isnan, isnan)
#ifdef NO_LONG_DOUBLE
strong_alias (__isnan, __isnanl)
weak_alias (__isnan, isnanl)
#endif