import newlib-2000-02-17 snapshot

1 files changed, 68 insertions, 0 deletions

diff --git a/newlib/libm/math/ef_remainder.c b/newlib/libm/math/ef_remainder.c
new file mode 100644
index 000000000..8ce7fac99
--- /dev/null
+++ b/newlib/libm/math/ef_remainder.c
@@ -0,0 +1,68 @@
+/* ef_remainder.c -- float version of e_remainder.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.
+ * ====================================================
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+static const float zero = 0.0;
+#else
+static float zero = 0.0;
+#endif
+
+
+#ifdef __STDC__
+	float __ieee754_remainderf(float x, float p)
+#else
+	float __ieee754_remainderf(x,p)
+	float x,p;
+#endif
+{
+	__int32_t hx,hp;
+	__uint32_t sx;
+	float p_half;
+
+	GET_FLOAT_WORD(hx,x);
+	GET_FLOAT_WORD(hp,p);
+	sx = hx&0x80000000;
+	hp &= 0x7fffffff;
+	hx &= 0x7fffffff;
+
+    /* purge off exception values */
+	if(hp==0) return (x*p)/(x*p);	 	/* p = 0 */
+	if((hx>=0x7f800000)||			/* x not finite */
+	  ((hp>0x7f800000)))			/* p is NaN */
+	    return (x*p)/(x*p);
+
+
+	if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p);	/* now x < 2p */
+	if ((hx-hp)==0) return zero*x;
+	x  = fabsf(x);
+	p  = fabsf(p);
+	if (hp<0x01000000) {
+	    if(x+x>p) {
+		x-=p;
+		if(x+x>=p) x -= p;
+	    }
+	} else {
+	    p_half = (float)0.5*p;
+	    if(x>p_half) {
+		x-=p;
+		if(x>=p_half) x -= p;
+	    }
+	}
+	GET_FLOAT_WORD(hx,x);
+	SET_FLOAT_WORD(x,hx^sx);
+	return x;
+}