1 /* 2 * Written by J.T. Conklin <jtc@netbsd.org>. 3 * Change for long double by Ulrich Drepper <drepper@cygnus.com>. 4 * Intel i387 specific version. 5 * Public domain. 6 */ 7 8 #if defined(LIBM_SCCS) && !defined(lint) 9 static char rcsid[] = "$NetBSD: $"; 10 #endif 11 12 /* 13 * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0; 14 * no branching! 15 */ 16 17 #include "math.h" 18 #include "math_private.h" 19 20 #ifdef __STDC__ 21 int __isinfl(long double x) 22 #else 23 int __isinfl(x) 24 long double x; 25 #endif 26 { 27 int32_t se,hx,lx; 28 GET_LDOUBLE_WORDS(se,hx,lx,x); 29 /* This additional ^ 0x80000000 is necessary because in Intel's 30 internal representation of the implicit one is explicit. */ 31 lx |= (hx ^ 0x80000000) | ((se & 0x7fff) ^ 0x7fff); 32 lx |= -lx; 33 se &= 0x8000; 34 return ~(lx >> 31) & (1 - (se >> 14)); 35 } 36 hidden_def (__isinfl) 37 weak_alias (__isinfl, isinfl) 38