mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 19:30:10 +00:00
f7eac6eb50
* Makeconfig ($(common-objpfx)config.make): Depend on config.h.in. Mon Mar 4 17:35:09 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * hurd/catch-signal.c (hurd_safe_memmove): New function. (hurd_safe_copyin, hurd_safe_copyout): New functions. * hurd/hurd/sigpreempt.h: Declare them. Sun Mar 3 08:43:44 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> Replace math code with fdlibm from Sun as modified for netbsd by JT Conklin and Ian Taylor, including x86 FPU support. * sysdeps/libm-ieee754, sysdeps/libm-i387: New directories. * math/math_private.h: New file. * sysdeps/i386/fpu/Implies: New file. * sysdeps/ieee754/Implies: New file. * math/machine/asm.h, math/machine/endian.h: New files. * math/Makefile, math/math.h: Rewritten. * mathcalls.h, math/mathcalls.h: New file, broken out of math.h. * math/finite.c: File removed. * sysdeps/generic/Makefile [$(subdir)=math]: Frobnication removed. * math/test-math.c: Include errno.h and string.h. * sysdeps/unix/bsd/dirstream.h: File removed. * sysdeps/unix/bsd/readdir.c: File removed.
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* @(#)s_modf.c 5.1 93/09/24 */
|
|
/*
|
|
* ====================================================
|
|
* 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: s_modf.c,v 1.8 1995/05/10 20:47:55 jtc Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* modf(double x, 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 double one = 1.0;
|
|
#else
|
|
static double one = 1.0;
|
|
#endif
|
|
|
|
#ifdef __STDC__
|
|
double __modf(double x, double *iptr)
|
|
#else
|
|
double __modf(x, iptr)
|
|
double x,*iptr;
|
|
#endif
|
|
{
|
|
int32_t i0,i1,j0;
|
|
u_int32_t i;
|
|
EXTRACT_WORDS(i0,i1,x);
|
|
j0 = ((i0>>20)&0x7ff)-0x3ff; /* exponent of x */
|
|
if(j0<20) { /* integer part in high x */
|
|
if(j0<0) { /* |x|<1 */
|
|
INSERT_WORDS(*iptr,i0&0x80000000,0); /* *iptr = +-0 */
|
|
return x;
|
|
} else {
|
|
i = (0x000fffff)>>j0;
|
|
if(((i0&i)|i1)==0) { /* x is integral */
|
|
u_int32_t high;
|
|
*iptr = x;
|
|
GET_HIGH_WORD(high,x);
|
|
INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
|
|
return x;
|
|
} else {
|
|
INSERT_WORDS(*iptr,i0&(~i),0);
|
|
return x - *iptr;
|
|
}
|
|
}
|
|
} else if (j0>51) { /* no fraction part */
|
|
u_int32_t high;
|
|
*iptr = x*one;
|
|
GET_HIGH_WORD(high,x);
|
|
INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
|
|
return x;
|
|
} else { /* fraction part in low x */
|
|
i = ((u_int32_t)(0xffffffff))>>(j0-20);
|
|
if((i1&i)==0) { /* x is integral */
|
|
u_int32_t high;
|
|
*iptr = x;
|
|
GET_HIGH_WORD(high,x);
|
|
INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
|
|
return x;
|
|
} else {
|
|
INSERT_WORDS(*iptr,i0,i1&(~i));
|
|
return x - *iptr;
|
|
}
|
|
}
|
|
}
|
|
weak_alias (__modf, modf)
|