diff options
Diffstat (limited to 'sysdeps/i386/fpu/s_isinfl.c')
| -rw-r--r-- | sysdeps/i386/fpu/s_isinfl.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/s_isinfl.c b/sysdeps/i386/fpu/s_isinfl.c new file mode 100644 index 0000000000..f07898fd1b --- /dev/null +++ b/sysdeps/i386/fpu/s_isinfl.c @@ -0,0 +1,36 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Change for long double by Ulrich Drepper <drepper@cygnus.com>. + * Intel i387 specific version. + * Public domain. + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: $"; +#endif + +/* + * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + int __isinfl(long double x) +#else + int __isinfl(x) + long double x; +#endif +{ + int32_t se,hx,lx; + GET_LDOUBLE_WORDS(se,hx,lx,x); + /* This additional ^ 0x80000000 is necessary because in Intel's + internal representation of the implicit one is explicit. */ + lx |= (hx ^ 0x80000000) | ((se & 0x7fff) ^ 0x7fff); + lx |= -lx; + se &= 0x8000; + return ~(lx >> 31) & (1 - (se >> 14)); +} +weak_alias (__isinfl, isinfl) |