Merge branch 'master' of ssh://git.gag.com/scm/git/fw/altos

[fw/altos] / src / math / ef_sqrt.c

diff --git a/src/math/ef_sqrt.c b/src/math/ef_sqrt.c
deleted file mode 100644 (file)
index 80e7f36..0000000
--- a/src/math/ef_sqrt.c
+++ /dev/null
@@ -1,89 +0,0 @@
-/* ef_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.
- * ====================================================
- */
-
-#include "fdlibm.h"
-
-#ifdef __STDC__
-static const float     one     = 1.0, tiny=1.0e-30;
-#else
-static float   one     = 1.0, tiny=1.0e-30;
-#endif
-
-#ifdef __STDC__
-       float __ieee754_sqrtf(float x)
-#else
-       float __ieee754_sqrtf(x)
-       float x;
-#endif
-{
-       float z;
-       __uint32_t r,hx;
-       __int32_t ix,s,q,m,t,i;
-
-       GET_FLOAT_WORD(ix,x);
-       hx = ix&0x7fffffff;
-
-    /* take care of Inf and NaN */
-       if(!FLT_UWORD_IS_FINITE(hx))
-           return x*x+x;               /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
-                                          sqrt(-inf)=sNaN */
-    /* take care of zero and -ves */
-       if(FLT_UWORD_IS_ZERO(hx)) return x;/* sqrt(+-0) = +-0 */
-       if(ix<0) return (x-x)/(x-x);            /* sqrt(-ve) = sNaN */
-
-    /* normalize x */
-       m = (ix>>23);
-       if(FLT_UWORD_IS_SUBNORMAL(hx)) {                /* subnormal x */
-           for(i=0;(ix&0x00800000L)==0;i++) ix<<=1;
-           m -= i-1;
-       }
-       m -= 127;       /* unbias exponent */
-       ix = (ix&0x007fffffL)|0x00800000L;
-       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 = 0x01000000L;                /* 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)+0x3f000000L;
-       ix += (m <<23);
-       SET_FLOAT_WORD(z,ix);
-       return z;
-}