1 files changed, 88 insertions, 0 deletions
diff --git a/src/math/hypotf.c b/src/math/hypotf.c
new file mode 100644
index 00000000..40acd917
--- /dev/null
+++ b/src/math/hypotf.c
@@ -0,0 +1,88 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/e_hypotf.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 "libm.h"
+
+float hypotf(float x, float y)
+{
+	float a,b,t1,t2,y1,y2,w;
+	int32_t j,k,ha,hb;
+
+	GET_FLOAT_WORD(ha,x);
+	ha &= 0x7fffffff;
+	GET_FLOAT_WORD(hb,y);
+	hb &= 0x7fffffff;
+	if (hb > ha) {
+		a = y;
+		b = x;
+		j=ha; ha=hb; hb=j;
+	} else {
+		a = x;
+		b = y;
+	}
+	a = fabsf(a);
+	b = fabsf(b);
+	if (ha - hb > 0xf000000)  /* x/y > 2**30 */
+		return a+b;
+	k = 0;
+	if (ha > 0x58800000) {    /* a > 2**50 */
+		if(ha >= 0x7f800000) {  /* Inf or NaN */
+			/* Use original arg order iff result is NaN; quieten sNaNs. */
+			w = fabsf(x+0.0F) - fabsf(y+0.0F);
+			if (ha == 0x7f800000) w = a;
+			if (hb == 0x7f800000) w = b;
+			return w;
+		}
+		/* scale a and b by 2**-68 */
+		ha -= 0x22000000; hb -= 0x22000000; k += 68;
+		SET_FLOAT_WORD(a, ha);
+		SET_FLOAT_WORD(b, hb);
+	}
+	if (hb < 0x26800000) {    /* b < 2**-50 */
+		if (hb <= 0x007fffff) {  /* subnormal b or 0 */
+			if (hb == 0)
+				return a;
+			SET_FLOAT_WORD(t1, 0x7e800000);  /* t1 = 2^126 */
+			b *= t1;
+			a *= t1;
+			k -= 126;
+		} else {   /* scale a and b by 2^68 */
+			ha += 0x22000000;  /* a *= 2^68 */
+			hb += 0x22000000;  /* b *= 2^68 */
+			k -= 68;
+			SET_FLOAT_WORD(a, ha);
+			SET_FLOAT_WORD(b, hb);
+		}
+	}
+	/* medium size a and b */
+	w = a - b;
+	if (w > b) {
+		SET_FLOAT_WORD(t1, ha&0xfffff000);
+		t2 = a - t1;
+		w  = sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));
+	} else {
+		a  = a + a;
+		SET_FLOAT_WORD(y1, hb&0xfffff000);
+		y2 = b - y1;
+		SET_FLOAT_WORD(t1,(ha+0x00800000)&0xfffff000);
+		t2 = a - t1;
+		w  = sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));
+	}
+	if (k != 0) {
+		SET_FLOAT_WORD(t1, 0x3f800000+(k<<23));
+		return t1*w;
+	}
+	return w;
+}