3a8617a83f
-- Begin comments from J.T. Conklin: The most significant improvement is the addition of "float" versions of the math functions that take float arguments, return floats, and do all operations in floating point. This doesn't help (performance) much on the i386, but they are still nice to have. The float versions were orginally done by Cygnus' Ian Taylor when fdlibm was integrated into the libm we support for embedded systems. I gave Ian a copy of my libm as a starting point since I had already fixed a lot of bugs & problems in Sun's original code. After he was done, I cleaned it up a bit and integrated the changes back into my libm. -- End comments Reviewed by: jkh Submitted by: jtc
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/* w_scalbf.c -- float version of w_scalb.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#ifndef lint
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static char rcsid[] = "$Id: w_scalbf.c,v 1.1 1994/08/10 20:35:40 jtc Exp $";
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#endif
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/*
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* wrapper scalbf(float x, float fn) is provide for
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* passing various standard test suite. One
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* should use scalbn() instead.
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*/
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#include "math.h"
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#include "math_private.h"
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#include <errno.h>
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#ifdef __STDC__
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#ifdef _SCALB_INT
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float scalbf(float x, int fn) /* wrapper scalbf */
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#else
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float scalbf(float x, float fn) /* wrapper scalbf */
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#endif
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#else
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float scalbf(x,fn) /* wrapper scalbf */
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#ifdef _SCALB_INT
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float x; int fn;
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#else
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float x,fn;
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#endif
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_scalbf(x,fn);
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#else
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float z;
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z = __ieee754_scalbf(x,fn);
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if(_LIB_VERSION == _IEEE_) return z;
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if(!(finitef(z)||isnanf(z))&&finitef(x)) {
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/* scalbf overflow */
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return (float)__kernel_standard((double)x,(double)fn,132);
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}
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if(z==(float)0.0&&z!=x) {
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/* scalbf underflow */
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return (float)__kernel_standard((double)x,(double)fn,133);
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}
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#ifndef _SCALB_INT
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if(!finitef(fn)) errno = ERANGE;
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#endif
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return z;
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#endif
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}
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