/* e_sqrtf.c -- float version of e_sqrt.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. * ====================================================
*/
/* take care of Inf and NaN */ if((ix&0x7f800000)==0x7f800000) { return x*x+x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
sqrt(-inf)=sNaN */
} /* take care of zero */ if(ix<=0) { if((ix&(~sign))==0) return x;/* sqrt(+-0) = +-0 */ elseif(ix<0) return (x-x)/(x-x); /* sqrt(-ve) = sNaN */
} /* normalize x */
m = (ix>>23); if(m==0) { /* subnormal x */ for(i=0;(ix&0x00800000)==0;i++) ix<<=1;
m -= i-1;
}
m -= 127; /* unbias exponent */
ix = (ix&0x007fffff)|0x00800000; if(m&1) /* odd m, double x to make it even */
ix += ix;
m >>= 1; /* m = [m/2] */
/* generate sqrt(x) bit by bit */
ix += ix;
q = s = 0; /* q = sqrt(x) */
r = 0x01000000; /* r = moving bit from right to left */
while(r!=0) {
t = s+r; if(t<=ix) {
s = t+r;
ix -= t;
q += r;
}
ix += ix;
r>>=1;
}
/* use floating add to find out rounding direction */ if(ix!=0) {
z = one-tiny; /* trigger inexact flag */ if (z>=one) {
z = one+tiny; if (z>one)
q += 2; else
q += (q&1);
}
}
ix = (q>>1)+0x3f000000;
ix += (m <<23);
SET_FLOAT_WORD(z,ix); return z;
} #endif
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung ist noch experimentell.
