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-rw-r--r--newlib/libm/mathfp/ef_hypot.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/newlib/libm/mathfp/ef_hypot.c b/newlib/libm/mathfp/ef_hypot.c
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+/* ef_hypot.c -- float version of e_hypot.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__
+ float hypotf(float x, float y)
+#else
+ float hypotf(x,y)
+ float x, y;
+#endif
+{
+ float a=x,b=y,t1,t2,y1,y2,w;
+ __int32_t j,k,ha,hb;
+
+ GET_FLOAT_WORD(ha,x);
+ ha &= 0x7fffffffL;
+ GET_FLOAT_WORD(hb,y);
+ hb &= 0x7fffffffL;
+ if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
+ SET_FLOAT_WORD(a,ha); /* a <- |a| */
+ SET_FLOAT_WORD(b,hb); /* b <- |b| */
+ if((ha-hb)>0xf000000L) {return a+b;} /* x/y > 2**30 */
+ k=0;
+ if(ha > 0x58800000L) { /* a>2**50 */
+ if(ha >= 0x7f800000L) { /* Inf or NaN */
+ w = a+b; /* for sNaN */
+ if(ha == 0x7f800000L) w = a;
+ if(hb == 0x7f800000L) w = b;
+ return w;
+ }
+ /* scale a and b by 2**-60 */
+ ha -= 0x5d800000L; hb -= 0x5d800000L; k += 60;
+ SET_FLOAT_WORD(a,ha);
+ SET_FLOAT_WORD(b,hb);
+ }
+ if(hb < 0x26800000L) { /* b < 2**-50 */
+ if(hb <= 0x007fffffL) { /* subnormal b or 0 */
+ if(hb==0) return a;
+ SET_FLOAT_WORD(t1,0x3f000000L); /* t1=2^126 */
+ b *= t1;
+ a *= t1;
+ k -= 126;
+ } else { /* scale a and b by 2^60 */
+ ha += 0x5d800000; /* a *= 2^60 */
+ hb += 0x5d800000; /* b *= 2^60 */
+ k -= 60;
+ 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&0xfffff000L);
+ t2 = a-t1;
+ w = sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));
+ } else {
+ a = a+a;
+ SET_FLOAT_WORD(y1,hb&0xfffff000L);
+ y2 = b - y1;
+ SET_FLOAT_WORD(t1,ha+0x00800000L);
+ t2 = a - t1;
+ w = sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));
+ }
+ if(k!=0) {
+ SET_FLOAT_WORD(t1,0x3f800000L+(k<<23));
+ return t1*w;
+ } else return w;
+}