diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/dbl-64/s_isinf.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/dbl-64/s_isinf.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/s_isinf.c b/REORG.TODO/sysdeps/ieee754/dbl-64/s_isinf.c new file mode 100644 index 0000000000..c0ad54538a --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/dbl-64/s_isinf.c @@ -0,0 +1,36 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>. + * Public domain. + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $"; +#endif + +/* + * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0; + * no branching! + */ + +#include <math.h> +#include <math_private.h> +#include <shlib-compat.h> + +int +__isinf (double x) +{ + int32_t hx, lx; + EXTRACT_WORDS (hx, lx, x); + lx |= (hx & 0x7fffffff) ^ 0x7ff00000; + lx |= -lx; + return ~(lx >> 31) & (hx >> 30); +} +hidden_def (__isinf) +weak_alias (__isinf, isinf) +#ifdef NO_LONG_DOUBLE +# if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23) +compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0); +# endif +weak_alias (__isinf, isinfl) +#endif |