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Diffstat (limited to 'src/math/s_cbrtf.c')
| -rw-r--r-- | src/math/s_cbrtf.c | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/src/math/s_cbrtf.c b/src/math/s_cbrtf.c deleted file mode 100644 index e7b46de7..00000000 --- a/src/math/s_cbrtf.c +++ /dev/null @@ -1,67 +0,0 @@ -/* s_cbrtf.c -- float version of s_cbrt.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 <math.h> -#include "math_private.h" - -/* cbrtf(x) - * Return cube root of x - */ -static const unsigned - B1 = 709958130, /* B1 = (84+2/3-0.03306235651)*2**23 */ - B2 = 642849266; /* B2 = (76+2/3-0.03306235651)*2**23 */ - -static const float -C = 5.4285717010e-01, /* 19/35 = 0x3f0af8b0 */ -D = -7.0530611277e-01, /* -864/1225 = 0xbf348ef1 */ -E = 1.4142856598e+00, /* 99/70 = 0x3fb50750 */ -F = 1.6071428061e+00, /* 45/28 = 0x3fcdb6db */ -G = 3.5714286566e-01; /* 5/14 = 0x3eb6db6e */ - -float -cbrtf(float x) -{ - float r,s,t; - int32_t hx; - uint32_t sign; - uint32_t high; - - GET_FLOAT_WORD(hx,x); - sign=hx&0x80000000; /* sign= sign(x) */ - hx ^=sign; - if(hx>=0x7f800000) return(x+x); /* cbrt(NaN,INF) is itself */ - if(hx==0) - return(x); /* cbrt(0) is itself */ - - SET_FLOAT_WORD(x,hx); /* x <- |x| */ - /* rough cbrt to 5 bits */ - if(hx<0x00800000) /* subnormal number */ - {SET_FLOAT_WORD(t,0x4b800000); /* set t= 2**24 */ - t*=x; GET_FLOAT_WORD(high,t); SET_FLOAT_WORD(t,high/3+B2); - } - else - SET_FLOAT_WORD(t,hx/3+B1); - - - /* new cbrt to 23 bits */ - r=t*t/x; - s=C+r*t; - t*=G+F/(s+E+D/s); - - /* retore the sign bit */ - GET_FLOAT_WORD(high,t); - SET_FLOAT_WORD(t,high|sign); - return(t); -} |