1  /*
2   * ====================================================
3   * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4   *
5   * Developed at SunPro, a Sun Microsystems, Inc. business.
6   * Permission to use, copy, modify, and distribute this
7   * software is freely granted, provided that this notice
8   * is preserved.
9   * ====================================================
10   */
11  
12  /*
13   * finite(x) returns 1 is x is finite, else 0;
14   * no branching!
15   */
16  
17  #include <math.h>
18  #include <math_private.h>
19  #include <ldbl-classify-compat.h>
20  #include <shlib-compat.h>
21  #include <stdint.h>
22  
23  int
__finite(double x)24  __finite (double x)
25  {
26    int64_t lx;
27    EXTRACT_WORDS64 (lx,x);
28    return (int)((uint64_t)((lx & INT64_C(0x7ff0000000000000))
29  			  - INT64_C (0x7ff0000000000000)) >> 63);
30  }
31  hidden_def (__finite)
32  weak_alias (__finite, finite)
33  #ifdef NO_LONG_DOUBLE
34  # if LDBL_CLASSIFY_COMPAT
35  #  if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
36  compat_symbol (libc, __finite, __finitel, GLIBC_2_0);
37  #  endif
38  #  if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_23)
39  compat_symbol (libm, __finite, __finitel, GLIBC_2_1);
40  #  endif
41  # endif
42  weak_alias (__finite, finitel)
43  #endif
44