| /* s_modfl.c -- long double version of s_modf.c. |
| * Conversion to long double by Ulrich Drepper, |
| * Cygnus Support, drepper@cygnus.com. |
| */ |
| |
| /* |
| * ==================================================== |
| * 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. |
| * ==================================================== |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$NetBSD: $"; |
| #endif |
| |
| /* |
| * modfl(long double x, long double *iptr) |
| * return fraction part of x, and return x's integral part in *iptr. |
| * Method: |
| * Bit twiddling. |
| * |
| * Exception: |
| * No exception. |
| */ |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| #ifdef __STDC__ |
| static const long double one = 1.0; |
| #else |
| static long double one = 1.0; |
| #endif |
| |
| #ifdef __STDC__ |
| long double __modfl(long double x, long double *iptr) |
| #else |
| long double __modfl(x, iptr) |
| long double x,*iptr; |
| #endif |
| { |
| int32_t i0,i1,j0; |
| u_int32_t i,se; |
| GET_LDOUBLE_WORDS(se,i0,i1,x); |
| j0 = (se&0x7fff)-0x3fff; /* exponent of x */ |
| if(j0<32) { /* integer part in high x */ |
| if(j0<0) { /* |x|<1 */ |
| SET_LDOUBLE_WORDS(*iptr,se&0x8000,0,0); /* *iptr = +-0 */ |
| return x; |
| } else { |
| i = (0x7fffffff)>>j0; |
| if(((i0&i)|i1)==0) { /* x is integral */ |
| *iptr = x; |
| SET_LDOUBLE_WORDS(x,se&0x8000,0,0); /* return +-0 */ |
| return x; |
| } else { |
| SET_LDOUBLE_WORDS(*iptr,se,i0&(~i),0); |
| return x - *iptr; |
| } |
| } |
| } else if (j0>63) { /* no fraction part */ |
| *iptr = x*one; |
| /* We must handle NaNs separately. */ |
| if (j0 == 0x4000 && ((i0 & 0x7fffffff) | i1)) |
| return x*one; |
| SET_LDOUBLE_WORDS(x,se&0x8000,0,0); /* return +-0 */ |
| return x; |
| } else { /* fraction part in low x */ |
| i = ((u_int32_t)(0x7fffffff))>>(j0-32); |
| if((i1&i)==0) { /* x is integral */ |
| *iptr = x; |
| SET_LDOUBLE_WORDS(x,se&0x8000,0,0); /* return +-0 */ |
| return x; |
| } else { |
| SET_LDOUBLE_WORDS(*iptr,se,i0,i1&(~i)); |
| return x - *iptr; |
| } |
| } |
| } |
| weak_alias (__modfl, modfl) |
