mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 02:50:09 +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.
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/* e_sqrtf.c -- float version of e_sqrt.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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: e_sqrtf.c,v 1.4 1995/05/10 20:46:19 jtc Exp $";
|
|
#endif
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __STDC__
|
|
static const float one = 1.0, tiny=1.0e-30;
|
|
#else
|
|
static float one = 1.0, tiny=1.0e-30;
|
|
#endif
|
|
|
|
#ifdef __STDC__
|
|
float __ieee754_sqrtf(float x)
|
|
#else
|
|
float __ieee754_sqrtf(x)
|
|
float x;
|
|
#endif
|
|
{
|
|
float z;
|
|
int32_t sign = (int)0x80000000;
|
|
int32_t ix,s,q,m,t,i;
|
|
u_int32_t r;
|
|
|
|
GET_FLOAT_WORD(ix,x);
|
|
|
|
/* take care of Inf and NaN */
|
|
if((ix&0x7f800000)==0x7f800000) {
|
|
return x*x+x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
|
|
sqrt(-inf)=sNaN */
|
|
}
|
|
/* take care of zero */
|
|
if(ix<=0) {
|
|
if((ix&(~sign))==0) return x;/* sqrt(+-0) = +-0 */
|
|
else if(ix<0)
|
|
return (x-x)/(x-x); /* sqrt(-ve) = sNaN */
|
|
}
|
|
/* normalize x */
|
|
m = (ix>>23);
|
|
if(m==0) { /* subnormal x */
|
|
for(i=0;(ix&0x00800000)==0;i++) ix<<=1;
|
|
m -= i-1;
|
|
}
|
|
m -= 127; /* unbias exponent */
|
|
ix = (ix&0x007fffff)|0x00800000;
|
|
if(m&1) /* odd m, double x to make it even */
|
|
ix += ix;
|
|
m >>= 1; /* m = [m/2] */
|
|
|
|
/* generate sqrt(x) bit by bit */
|
|
ix += ix;
|
|
q = s = 0; /* q = sqrt(x) */
|
|
r = 0x01000000; /* r = moving bit from right to left */
|
|
|
|
while(r!=0) {
|
|
t = s+r;
|
|
if(t<=ix) {
|
|
s = t+r;
|
|
ix -= t;
|
|
q += r;
|
|
}
|
|
ix += ix;
|
|
r>>=1;
|
|
}
|
|
|
|
/* use floating add to find out rounding direction */
|
|
if(ix!=0) {
|
|
z = one-tiny; /* trigger inexact flag */
|
|
if (z>=one) {
|
|
z = one+tiny;
|
|
if (z>one)
|
|
q += 2;
|
|
else
|
|
q += (q&1);
|
|
}
|
|
}
|
|
ix = (q>>1)+0x3f000000;
|
|
ix += (m <<23);
|
|
SET_FLOAT_WORD(z,ix);
|
|
return z;
|
|
}
|