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02bbfb414f
This runs the attached sed script against these files using a regex which aggressively matches long double literals when not obviously part of a comment. Likewise, 5 digit or less integral constants are replaced with integer constants, excepting the two cases of 0 used in large tables, which are also the only integral values of the form x.0*E0L encountered within these converted files. Likewise, -L(x) is transformed into L(-x). Naturally, the script has a few minor hiccups which are more clearly remedied via the attached fixup patch. Such hiccups include, context-sensitive promotion to a real type, and munging constants inside harder to detect comment blocks.
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* s_scalbnl.c -- long double version of s_scalbn.c.
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* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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*/
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/* @(#)s_scalbn.c 5.1 93/09/24 */
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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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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: $";
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#endif
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/*
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* scalbnl (long double x, int n)
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* scalbnl(x,n) returns x* 2**n computed by exponent
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* manipulation rather than by actually performing an
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* exponentiation or a multiplication.
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*/
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#include <math.h>
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#include <math_private.h>
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static const _Float128
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two114 = L(2.0769187434139310514121985316880384E+34), /* 0x4071000000000000, 0 */
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twom114 = L(4.8148248609680896326399448564623183E-35), /* 0x3F8D000000000000, 0 */
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huge = L(1.0E+4900),
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tiny = L(1.0E-4900);
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_Float128 __scalbnl (_Float128 x, int n)
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{
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int64_t k,hx,lx;
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GET_LDOUBLE_WORDS64(hx,lx,x);
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k = (hx>>48)&0x7fff; /* extract exponent */
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if (k==0) { /* 0 or subnormal x */
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if ((lx|(hx&0x7fffffffffffffffULL))==0) return x; /* +-0 */
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x *= two114;
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GET_LDOUBLE_MSW64(hx,x);
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k = ((hx>>48)&0x7fff) - 114;
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}
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if (k==0x7fff) return x+x; /* NaN or Inf */
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if (n< -50000) return tiny*__copysignl(tiny,x); /*underflow*/
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if (n> 50000 || k+n > 0x7ffe)
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return huge*__copysignl(huge,x); /* overflow */
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/* Now k and n are bounded we know that k = k+n does not
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overflow. */
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k = k+n;
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if (k > 0) /* normal result */
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{SET_LDOUBLE_MSW64(x,(hx&0x8000ffffffffffffULL)|(k<<48)); return x;}
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if (k <= -114)
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return tiny*__copysignl(tiny,x); /*underflow*/
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k += 114; /* subnormal result */
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SET_LDOUBLE_MSW64(x,(hx&0x8000ffffffffffffULL)|(k<<48));
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return x*twom114;
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}
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