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authorUlrich Drepper <drepper@redhat.com>2000-10-26 23:41:17 +0000
committerUlrich Drepper <drepper@redhat.com>2000-10-26 23:41:17 +0000
commitd8337213c83c3bd4aa32e16669745dd7ee32b329 (patch)
treec9f1296e2e3f355d296e4d8258c8380393006fc0 /sysdeps/ieee754/ldbl-128/e_hypotl.c
parent5be068fc154b697b56cce171a73eccf572f86937 (diff)
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Update.
	* locale/C-monetary.c: Set mon_decimal to empty string.
	Add missing entry _NL_MONETARY_CRNCYSTR.
	* stdio-common/printf_fp.c: If MON_DECIAL_POINT is not provided use
	DECIMAL_POINT information.
	* locale/C-numeric.c: Set mon_grouping entry to empty string.
	* locale/C-time.c: Add date_fmt entries.  Remove two wrong entries.
	Correct value for number of entries.
	* locale/localeconv.c: Normalize result passed back in .grouping.
	Fix assignment to .int_* entries.

	* locale/Makefile (tests): Add tst-C-locale.
	* locale/tst-C-locale.c: New file.

	* locale/setlocale.c: Use LOCALEDIR and not LOCALE_PATH to locate
	locale files.
	* locale/newlocale.c: Likewise.

2000-10-26  GOTO Masanori  <gotom@debian.or.jp>

	* locale/langinfo.h: Define _DATE_FMT and _NL_W_DATE_FMT.
	* locale/categories.def: New support for date_fmt.
	* locale/programs/ld-time.c: Likewise.
	* locale/programs/locfile-kw.gperf: Likewise.
	* locale/programs/locfile-kw.h: Likewise.
	* locale/programs/locfile-token.h: Likewise.

2000-10-26  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/ieee754/ldbl-128/e_hypotl.c: New.

	* math/libm-test.inc (cabs_test, cexp_test, csqrt_test, hypot_test):
	Increase precision of constants.
	* sysdeps/alpha/fpu/libm-test-ulps: Update.
	* sysdeps/arm/libm-test-ulps: Update.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/ia64/fpu/libm-test-ulps: Update.
	* sysdeps/m68k/fpu/libm-test-ulps: Update.
	* sysdeps/mips/fpu/libm-test-ulps: Update.
	* sysdeps/powerpc/fpu/libm-test-ulps: Update.
	* sysdeps/sparc/sparc32/fpu/libm-test-ulps: Update.
	* sysdeps/sparc/sparc64/fpu/libm-test-ulps: Update.
	* sysdeps/sh/sh4/fpu/libm-test-ulps: Update.
	* sysdeps/s390/fpu/libm-test-ulps: Update.

2000-10-26  Ulrich Drepper  <drepper@redhat.com>
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/e_hypotl.c')
-rw-r--r--sysdeps/ieee754/ldbl-128/e_hypotl.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/e_hypotl.c b/sysdeps/ieee754/ldbl-128/e_hypotl.c
new file mode 100644
index 0000000000..6834eac59c
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128/e_hypotl.c
@@ -0,0 +1,132 @@
+/* e_hypotl.c -- long double version of e_hypot.c.
+ * Conversion to long double by Jakub Jelinek, jakub@redhat.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_hypotl.c,v 1.9 1995/05/12 04:57:27 jtc Exp $";
+#endif
+
+/* __ieee754_hypotl(x,y)
+ *
+ * Method :
+ *	If (assume round-to-nearest) z=x*x+y*y
+ *	has error less than sqrtl(2)/2 ulp, than
+ *	sqrtl(z) has error less than 1 ulp (exercise).
+ *
+ *	So, compute sqrtl(x*x+y*y) with some care as
+ *	follows to get the error below 1 ulp:
+ *
+ *	Assume x>y>0;
+ *	(if possible, set rounding to round-to-nearest)
+ *	1. if x > 2y  use
+ *		x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y
+ *	where x1 = x with lower 64 bits cleared, x2 = x-x1; else
+ *	2. if x <= 2y use
+ *		t1*y1+((x-y)*(x-y)+(t1*y2+t2*y))
+ *	where t1 = 2x with lower 64 bits cleared, t2 = 2x-t1,
+ *	y1= y with lower 64 bits chopped, y2 = y-y1.
+ *
+ *	NOTE: scaling may be necessary if some argument is too
+ *	      large or too tiny
+ *
+ * Special cases:
+ *	hypotl(x,y) is INF if x or y is +INF or -INF; else
+ *	hypotl(x,y) is NAN if x or y is NAN.
+ *
+ * Accuracy:
+ * 	hypotl(x,y) returns sqrtl(x^2+y^2) with error less
+ * 	than 1 ulps (units in the last place)
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+	long double __ieee754_hypotl(long double x, long double y)
+#else
+	long double __ieee754_hypotl(x,y)
+	long double x, y;
+#endif
+{
+	long double a,b,t1,t2,y1,y2,w;
+	int64_t j,k,ha,hb;
+
+	GET_LDOUBLE_MSW64(ha,x);
+	ha &= 0x7fffffffffffffffLL;
+	GET_LDOUBLE_MSW64(hb,y);
+	hb &= 0x7fffffffffffffffLL;
+	if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
+	SET_LDOUBLE_MSW64(a,ha);	/* a <- |a| */
+	SET_LDOUBLE_MSW64(b,hb);	/* b <- |b| */
+	if((ha-hb)>0x78000000000000LL) {return a+b;} /* x/y > 2**120 */
+	k=0;
+	if(ha > 0x5f3f000000000000LL) {	/* a>2**8000 */
+	   if(ha >= 0x7fff000000000000LL) {	/* Inf or NaN */
+	       u_int64_t low;
+	       w = a+b;			/* for sNaN */
+	       GET_LDOUBLE_LSW64(low,a);
+	       if(((ha&0xffffffffffffLL)|low)==0) w = a;
+	       GET_LDOUBLE_LSW64(low,b);
+	       if(((hb^0x7fff000000000000LL)|low)==0) w = b;
+	       return w;
+	   }
+	   /* scale a and b by 2**-9600 */
+	   ha -= 0x2580000000000000LL;
+	   hb -= 0x2580000000000000LL;	k += 9600;
+	   SET_LDOUBLE_MSW64(a,ha);
+	   SET_LDOUBLE_MSW64(b,hb);
+	}
+	if(hb < 0x20bf000000000000LL) {	/* b < 2**-8000 */
+	    if(hb <= 0x0000ffffffffffffLL) {	/* subnormal b or 0 */
+	        u_int64_t low;
+		GET_LDOUBLE_LSW64(low,b);
+		if((hb|low)==0) return a;
+		t1=0;
+		SET_LDOUBLE_MSW64(t1,0x7ffd000000000000LL); /* t1=2^16382 */
+		b *= t1;
+		a *= t1;
+		k -= 16382;
+	    } else {		/* scale a and b by 2^9600 */
+	        ha += 0x2580000000000000LL; 	/* a *= 2^9600 */
+		hb += 0x2580000000000000LL;	/* b *= 2^9600 */
+		k -= 9600;
+		SET_LDOUBLE_MSW64(a,ha);
+		SET_LDOUBLE_MSW64(b,hb);
+	    }
+	}
+    /* medium size a and b */
+	w = a-b;
+	if (w>b) {
+	    t1 = 0;
+	    SET_LDOUBLE_MSW64(t1,ha);
+	    t2 = a-t1;
+	    w  = __ieee754_sqrtl(t1*t1-(b*(-b)-t2*(a+t1)));
+	} else {
+	    a  = a+a;
+	    y1 = 0;
+	    SET_LDOUBLE_MSW64(y1,hb);
+	    y2 = b - y1;
+	    t1 = 0;
+	    SET_LDOUBLE_MSW64(t1,ha+0x0001000000000000LL);
+	    t2 = a - t1;
+	    w  = __ieee754_sqrtl(t1*y1-(w*(-w)-(t1*y2+t2*b)));
+	}
+	if(k!=0) {
+	    u_int64_t high;
+	    t1 = 1.0L;
+	    GET_LDOUBLE_MSW64(high,t1);
+	    SET_LDOUBLE_MSW64(t1,high+(k<<48));
+	    return t1*w;
+	} else return w;
+}