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* 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.
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* e_hypotf.c -- float version of e_hypot.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: e_hypotf.c,v 1.5 1995/05/12 04:57:30 jtc Exp $";
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#endif
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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float __ieee754_hypotf(float x, float y)
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#else
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float __ieee754_hypot(x,y)
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float x, y;
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#endif
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{
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float a=x,b=y,t1,t2,y1,y2,w;
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int32_t j,k,ha,hb;
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GET_FLOAT_WORD(ha,x);
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ha &= 0x7fffffff;
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GET_FLOAT_WORD(hb,y);
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hb &= 0x7fffffff;
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if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
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SET_FLOAT_WORD(a,ha); /* a <- |a| */
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SET_FLOAT_WORD(b,hb); /* b <- |b| */
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if((ha-hb)>0xf000000) {return a+b;} /* x/y > 2**30 */
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k=0;
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if(ha > 0x58800000) { /* a>2**50 */
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if(ha >= 0x7f800000) { /* Inf or NaN */
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w = a+b; /* for sNaN */
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if(ha == 0x7f800000) w = a;
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if(hb == 0x7f800000) w = b;
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return w;
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}
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/* scale a and b by 2**-60 */
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ha -= 0x5d800000; hb -= 0x5d800000; k += 60;
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SET_FLOAT_WORD(a,ha);
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SET_FLOAT_WORD(b,hb);
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}
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if(hb < 0x26800000) { /* b < 2**-50 */
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if(hb <= 0x007fffff) { /* subnormal b or 0 */
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if(hb==0) return a;
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SET_FLOAT_WORD(t1,0x3f000000); /* t1=2^126 */
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b *= t1;
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a *= t1;
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k -= 126;
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} else { /* scale a and b by 2^60 */
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ha += 0x5d800000; /* a *= 2^60 */
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hb += 0x5d800000; /* b *= 2^60 */
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k -= 60;
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SET_FLOAT_WORD(a,ha);
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SET_FLOAT_WORD(b,hb);
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}
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}
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/* medium size a and b */
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w = a-b;
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if (w>b) {
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SET_FLOAT_WORD(t1,ha&0xfffff000);
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t2 = a-t1;
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w = __ieee754_sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));
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} else {
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a = a+a;
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SET_FLOAT_WORD(y1,hb&0xfffff000);
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y2 = b - y1;
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SET_FLOAT_WORD(t1,ha+0x00800000);
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t2 = a - t1;
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w = __ieee754_sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));
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}
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if(k!=0) {
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SET_FLOAT_WORD(t1,0x3f800000+(k<<23));
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return t1*w;
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} else return w;
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}
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