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, 87 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_roundl.c b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_roundl.c
new file mode 100644
index 0000000000..0b70e24637
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_roundl.c
@@ -0,0 +1,87 @@
+/* Round to int long double floating-point values.
+   IBM extended format long double version.
+   Copyright (C) 2006-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This has been coded in assembler because GCC makes such a mess of it
+   when it's coded in C.  */
+
+#include <math.h>
+#include <math_ldbl_opt.h>
+#include <float.h>
+#include <ieee754.h>
+
+
+long double
+__roundl (long double x)
+{
+  double xh, xl, hi, lo;
+
+  ldbl_unpack (x, &xh, &xl);
+
+  /* Return Inf, Nan, +/-0 unchanged.  */
+  if (__builtin_expect (xh != 0.0
+			&& __builtin_isless (__builtin_fabs (xh),
+					     __builtin_inf ()), 1))
+    {
+      hi = __round (xh);
+      if (hi != xh)
+	{
+	  /* The high part is not an integer; the low part only
+	     affects the result if the high part is exactly half way
+	     between two integers and the low part is nonzero with the
+	     opposite sign.  */
+	  if (fabs (hi - xh) == 0.5)
+	    {
+	      if (xh > 0 && xl < 0)
+		xh = hi - 1;
+	      else if (xh < 0 && xl > 0)
+		xh = hi + 1;
+	      else
+		xh = hi;
+	    }
+	  else
+	    xh = hi;
+	  xl = 0;
+	}
+      else
+	{
+	  /* The high part is a nonzero integer.  */
+	  lo = __round (xl);
+	  if (fabs (lo - xl) == 0.5)
+	    {
+	      if (xh > 0 && xl < 0)
+		xl = lo + 1;
+	      else if (xh < 0 && lo > 0)
+		xl = lo - 1;
+	      else
+		xl = lo;
+	    }
+	  else
+	    xl = lo;
+	  xh = hi;
+	  ldbl_canonicalize_int (&xh, &xl);
+	}
+    }
+  else
+    /* Quiet signaling NaN arguments.  */
+    xh += xh;
+
+  return ldbl_pack (xh, xl);
+}
+
+long_double_symbol (libm, __roundl, roundl);