Correctly handle m68k long double format.

sysdeps/m68k/fpu/s_fpclassifyl.c

@@ -0,0 +1,43 @@
+/* Return classification value corresponding to argument.  m68k version.
+   Copyright (C) 1997,2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+   Fixed for m68k by Andreas Schwab <schwab@suse.de>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <math.h>
+
+#include "math_private.h"
+
+
+int
+__fpclassifyl (long double x)
+{
+  u_int32_t ex, hx, lx;
+  int retval = FP_NORMAL;
+
+  GET_LDOUBLE_WORDS (ex, hx, lx, x);
+  ex &= 0x7fff;
+  if ((ex | hx | lx) == 0)
+    retval = FP_ZERO;
+  else if (ex == 0 && (hx & 0x80000000) == 0)
+    retval = FP_SUBNORMAL;
+  else if (ex == 0x7fff)
+    retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;
+
+  return retval;
+}

sysdeps/m68k/fpu/s_nextafterl.c

@@ -0,0 +1,109 @@
+/* s_nextafterl.c -- long double version of s_nextafter.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@cygnus.com.
+ * Fixed for m68k by Andreas Schwab <schwab@suse.de>.
+ */
+
+/*
+ * ====================================================
+ * 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
+
+/* IEEE functions
+ *	nextafterl(x,y)
+ *	return the next machine floating-point number of x in the
+ *	direction toward y.
+ *   Special cases:
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+	long double __nextafterl(long double x, long double y)
+#else
+	long double __nextafterl(x,y)
+	long double x,y;
+#endif
+{
+	int32_t ix,iy,esx,esy;
+	u_int32_t hx,hy,lx,ly;
+
+	GET_LDOUBLE_WORDS(esx,hx,lx,x);
+	GET_LDOUBLE_WORDS(esy,hy,ly,y);
+	ix = esx&0x7fff;		/* |x| */
+	iy = esy&0x7fff;		/* |y| */
+
+	if(((ix==0x7fff)&&((hx&0x7fffffff)|lx)!=0) ||   /* x is nan */
+	   ((iy==0x7fff)&&((hy&0x7fffffff)|ly)!=0))     /* y is nan */
+	   return x+y;
+	if(x==y) return y;		/* x=y, return y */
+	if((ix|hx|lx)==0) {			/* x == 0 */
+	    SET_LDOUBLE_WORDS(x,esy&0x8000,0,1);/* return +-minsubnormal */
+	    y = x*x;
+	    if(y==x) return y; else return x;	/* raise underflow flag */
+	}
+	if(esx>=0) {			/* x > 0 */
+	    if(esx>esy||((esx==esy) && (hx>hy||((hx==hy)&&(lx>ly))))) {
+	      /* x > y, x -= ulp */
+		if(lx==0) {
+		    if (ix != 0 && hx == 0x80000000) hx = 0;
+		    if (hx==0) esx -= 1;
+		    hx -= 1;
+		}
+		lx -= 1;
+	    } else {				/* x < y, x += ulp */
+		lx += 1;
+		if(lx==0) {
+		    hx += 1;
+		    if (hx==0) {
+			hx = 0x80000000;
+			esx += 1;
+		    }
+		}
+	    }
+	} else {				/* x < 0 */
+	    if(esy>=0||esx>esy||((esx==esy) && (hx>hy||((hx==hy)&&(lx>ly))))){
+	      /* x < y, x -= ulp */
+		if(lx==0) {
+		    if (ix != 0 && hx == 0x80000000) hx = 0;
+		    if (hx==0) esx -= 1;
+		    hx -= 1;
+		}
+		lx -= 1;
+	    } else {				/* x > y, x += ulp */
+		lx += 1;
+		if(lx==0) {
+		    hx += 1;
+		    if (hx==0) {
+			hx = 0x80000000;
+			esx += 1;
+		    }
+		}
+	    }
+	}
+	esy = esx&0x7fff;
+	if(esy==0x7fff) return x+x;	/* overflow  */
+	if(esy==0 && (hx & 0x80000000) == 0) { /* underflow */
+	    y = x*x;
+	    if(y!=x) {		/* raise underflow flag */
+	        SET_LDOUBLE_WORDS(y,esx,hx,lx);
+		return y;
+	    }
+	}
+	SET_LDOUBLE_WORDS(x,esx,hx,lx);
+	return x;
+}
+weak_alias (__nextafterl, nextafterl)
+strong_alias (__nextafterl, __nexttowardl)
+weak_alias (__nextafterl, nexttowardl)