Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 104 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c
new file mode 100644
index 0000000000..0c4508835e
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c
@@ -0,0 +1,104 @@
+/* s_scalbnl.c -- long double version of s_scalbn.c.
+ * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
+ */
+
+/* @(#)s_scalbn.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/*
+ * scalbnl (long double x, int n)
+ * scalbnl(x,n) returns x* 2**n  computed by  exponent
+ * manipulation rather than by actually performing an
+ * exponentiation or a multiplication.
+ */
+
+#include <math.h>
+#include <math_private.h>
+#include <math_ldbl_opt.h>
+
+static const long double
+twolm54 = 5.55111512312578270212e-17, /* 0x3C90000000000000, 0 */
+huge   = 1.0E+300L,
+tiny   = 1.0E-300L;
+static const double
+two54 = 1.80143985094819840000e+16, /* 0x4350000000000000 */
+twom54 = 5.55111512312578270212e-17; /* 0x3C90000000000000 */
+
+long double __scalbnl (long double x, int n)
+{
+	int64_t k,l,hx,lx;
+	union { int64_t i; double d; } u;
+	double xhi, xlo;
+
+	ldbl_unpack (x, &xhi, &xlo);
+	EXTRACT_WORDS64 (hx, xhi);
+	EXTRACT_WORDS64 (lx, xlo);
+	k = (hx>>52)&0x7ff;		/* extract exponent */
+	l = (lx>>52)&0x7ff;
+	if (k==0) {				/* 0 or subnormal x */
+	    if ((hx&0x7fffffffffffffffULL)==0) return x; /* +-0 */
+	    u.i = hx;
+	    u.d *= two54;
+	    hx = u.i;
+	    k = ((hx>>52)&0x7ff) - 54;
+	}
+	else if (k==0x7ff) return x+x;		/* NaN or Inf */
+	if (n< -50000) return tiny*__copysignl(tiny,x); /*underflow */
+	if (n> 50000 || k+n > 0x7fe)
+	  return huge*__copysignl(huge,x); /* overflow */
+	/* Now k and n are bounded we know that k = k+n does not
+	   overflow.  */
+	k = k+n;
+	if (k > 0) {				/* normal result */
+	    hx = (hx&0x800fffffffffffffULL)|(k<<52);
+	    if ((lx & 0x7fffffffffffffffULL) == 0) { /* low part +-0 */
+		INSERT_WORDS64 (xhi, hx);
+		INSERT_WORDS64 (xlo, lx);
+		x = ldbl_pack (xhi, xlo);
+		return x;
+	    }
+	    if (l == 0) { /* low part subnormal */
+		u.i = lx;
+		u.d *= two54;
+		lx = u.i;
+		l = ((lx>>52)&0x7ff) - 54;
+	    }
+	    l = l + n;
+	    if (l > 0)
+		lx = (lx&0x800fffffffffffffULL)|(l<<52);
+	    else if (l <= -54)
+		lx = (lx&0x8000000000000000ULL);
+	    else {
+		l += 54;
+		u.i = (lx&0x800fffffffffffffULL)|(l<<52);
+		u.d *= twom54;
+		lx = u.i;
+	    }
+	    INSERT_WORDS64 (xhi, hx);
+	    INSERT_WORDS64 (xlo, lx);
+	    x = ldbl_pack (xhi, xlo);
+	    return x;
+	}
+	if (k <= -54)
+	  return tiny*__copysignl(tiny,x); 	/*underflow*/
+	k += 54;				/* subnormal result */
+	lx &= 0x8000000000000000ULL;
+	hx &= 0x800fffffffffffffULL;
+	INSERT_WORDS64 (xhi, hx|(k<<52));
+	INSERT_WORDS64 (xlo, lx);
+	x = ldbl_pack (xhi, xlo);
+	return x*twolm54;
+}