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Diffstat (limited to 'sysdeps/ieee754/ldbl-96/e_remainderl.c')
-rw-r--r--sysdeps/ieee754/ldbl-96/e_remainderl.c83
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diff --git a/sysdeps/ieee754/ldbl-96/e_remainderl.c b/sysdeps/ieee754/ldbl-96/e_remainderl.c
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+++ b/sysdeps/ieee754/ldbl-96/e_remainderl.c
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+/* e_remainderl.c -- long double version of e_remainder.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@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: $";
+#endif
+
+/* __ieee754_remainderl(x,p)
+ * Return :
+ * returns x REM p = x - [x/p]*p as if in infinite
+ * precise arithmetic, where [x/p] is the (infinite bit)
+ * integer nearest x/p (in half way case choose the even one).
+ * Method :
+ * Based on fmod() return x-[x/p]chopped*p exactlp.
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+static const long double zero = 0.0;
+#else
+static long double zero = 0.0;
+#endif
+
+
+#ifdef __STDC__
+ long double __ieee754_remainderl(long double x, long double p)
+#else
+ long double __ieee754_remainderl(x,p)
+ long double x,p;
+#endif
+{
+ u_int32_t sx,sex,sep,x0,x1,p0,p1;
+ long double p_half;
+
+ GET_LDOUBLE_WORDS(sex,x0,x1,x);
+ GET_LDOUBLE_WORDS(sep,p0,p1,p);
+ sx = sex&0x8000;
+ sep &= 0x7fff;
+ sex &= 0x7fff;
+
+ /* purge off exception values */
+ if((sep|p0|p1)==0) return (x*p)/(x*p); /* p = 0 */
+ if((sex==0x7fff)|| /* x not finite */
+ ((sep==0x7fff)&& /* p is NaN */
+ ((p0|p1)!=0)))
+ return (x*p)/(x*p);
+
+
+ if (sep<0x7ffe) x = __ieee754_fmodl(x,p+p); /* now x < 2p */
+ if (((sex-sep)|(x0-p0)|(x1-p1))==0) return zero*x;
+ x = fabsl(x);
+ p = fabsl(p);
+ if (sep<0x0002) {
+ if(x+x>p) {
+ x-=p;
+ if(x+x>=p) x -= p;
+ }
+ } else {
+ p_half = 0.5*p;
+ if(x>p_half) {
+ x-=p;
+ if(x>=p_half) x -= p;
+ }
+ }
+ GET_LDOUBLE_EXP(sex,x);
+ SET_LDOUBLE_EXP(x,sex^sx);
+ return x;
+}