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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [mathfp/] [ef_hypot.c] - Rev 307
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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; }
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