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, 191 insertions, 0 deletions

diff --git a/REORG.TODO/stdlib/gen-tst-strtod-round.c b/REORG.TODO/stdlib/gen-tst-strtod-round.c
new file mode 100644
index 0000000000..d792a245be
--- /dev/null
+++ b/REORG.TODO/stdlib/gen-tst-strtod-round.c
@@ -0,0 +1,191 @@
+/* Generate table of tests in tst-strtod-round.c from
+   tst-strtod-round-data.
+   Copyright (C) 2012-2017 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/>.  */
+
+/* Compile this program as:
+
+   gcc -std=gnu11 -O2 -Wall -Wextra gen-tst-strtod-round.c -lmpfr \
+     -o gen-tst-strtod-round
+
+   (use of current MPFR version recommended) and run it as:
+
+   gen-tst-strtod-round tst-strtod-round-data tst-strtod-round-data.h
+
+   The output file will be generated as tst-strtod-round-data.h
+*/
+
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <mpfr.h>
+
+/* Work around incorrect ternary value from mpfr_strtofr
+   <https://sympa.inria.fr/sympa/arc/mpfr/2012-08/msg00005.html>.  */
+#define WORKAROUND
+
+static int
+string_to_fp (mpfr_t f, const char *s, mpfr_rnd_t rnd)
+{
+#ifdef WORKAROUND
+  mpfr_t f2;
+  mpfr_init2 (f2, 100000);
+  int r0 = mpfr_strtofr (f2, s, NULL, 0, rnd);
+  int r = mpfr_set (f, f2, rnd);
+  r |= mpfr_subnormalize (f, r, rnd);
+  mpfr_clear (f2);
+  return r0 | r;
+#else
+  int r = mpfr_strtofr (f, s, NULL, 0, rnd);
+  r |= mpfr_subnormalize (f, r, rnd);
+  return r;
+#endif
+}
+
+void
+print_fp (FILE *fout, mpfr_t f, const char *suffix)
+{
+  if (mpfr_inf_p (f))
+    mpfr_fprintf (fout, "\t%sINF%s", mpfr_signbit (f) ? "-" : "", suffix);
+  else
+    mpfr_fprintf (fout, "\t%Ra%s", f, suffix);
+}
+
+static void
+round_str (FILE *fout, const char *s, int prec, int emin, int emax,
+	   bool ibm_ld)
+{
+  mpfr_t f;
+  mpfr_set_default_prec (prec);
+  mpfr_set_emin (emin);
+  mpfr_set_emax (emax);
+  mpfr_init (f);
+  int r = string_to_fp (f, s, MPFR_RNDD);
+  if (ibm_ld)
+    {
+      assert (prec == 106 && emin == -1073 && emax == 1024);
+      /* The maximum value in IBM long double has discontiguous
+	 mantissa bits.  */
+      mpfr_t max_value;
+      mpfr_init2 (max_value, 107);
+      mpfr_set_str (max_value, "0x1.fffffffffffff7ffffffffffffcp+1023", 0,
+		    MPFR_RNDN);
+      if (mpfr_cmpabs (f, max_value) > 0)
+	r = 1;
+      mpfr_clear (max_value);
+    }
+  mpfr_fprintf (fout, "\t%s,\n", r ? "false" : "true");
+  print_fp (fout, f, ",\n");
+  string_to_fp (f, s, MPFR_RNDN);
+  print_fp (fout, f, ",\n");
+  string_to_fp (f, s, MPFR_RNDZ);
+  print_fp (fout, f, ",\n");
+  string_to_fp (f, s, MPFR_RNDU);
+  print_fp (fout, f, "");
+  mpfr_clear (f);
+}
+
+static void
+round_for_all (FILE *fout, const char *s)
+{
+  static const struct fmt {
+    int prec;
+    int emin;
+    int emax;
+    bool ibm_ld;
+  } formats[] = {
+    { 24, -148, 128, false },
+    { 53, -1073, 1024, false },
+    /* This is the Intel extended float format.  */
+    { 64, -16444, 16384, false },
+    /* This is the Motorola extended float format.  */
+    { 64, -16445, 16384, false },
+    { 106, -1073, 1024, true },
+    { 113, -16493, 16384, false },
+  };
+  mpfr_fprintf (fout, "  TEST (\"");
+  const char *p;
+  for (p = s; *p; p++)
+    {
+      fputc (*p, fout);
+      if ((p - s) % 60 == 59 && p[1])
+	mpfr_fprintf (fout, "\"\n\t\"");
+    }
+  mpfr_fprintf (fout, "\",\n");
+  int i;
+  int n_formats = sizeof (formats) / sizeof (formats[0]);
+  for (i = 0; i < n_formats; i++)
+    {
+      round_str (fout, s, formats[i].prec, formats[i].emin,
+		 formats[i].emax, formats[i].ibm_ld);
+      if (i < n_formats - 1)
+	mpfr_fprintf (fout, ",\n");
+    }
+  mpfr_fprintf (fout, "),\n");
+}
+
+int
+main (int argc, char **argv)
+{
+  char *p = NULL;
+  size_t len;
+  ssize_t nbytes;
+  FILE *fin, *fout;
+  char *fin_name, *fout_name;
+
+  if (argc < 3)
+    {
+      fprintf (stderr, "Usage: %s <input> <output>\n", basename (argv[0]));
+      return EXIT_FAILURE;
+    }
+
+  fin_name = argv[1];
+  fout_name = argv[2];
+
+  fin = fopen (fin_name, "r");
+  if (fin == NULL)
+    {
+      perror ("Could not open input for reading");
+      return EXIT_FAILURE;
+    }
+
+  fout = fopen (fout_name, "w");
+  if (fout == NULL)
+    {
+      perror ("Could not open output for writing");
+      return EXIT_FAILURE;
+    }
+
+  fprintf (fout, "/* This file was generated by %s from %s.  */\n",
+	  __FILE__, fin_name);
+  fputs ("static const struct test tests[] = {\n", fout);
+  while ((nbytes = getline (&p, &len, fin)) != -1)
+    {
+      if (p[nbytes - 1] == '\n')
+	p[nbytes - 1] = 0;
+      round_for_all (fout, p);
+      free (p);
+      p = NULL;
+    }
+  fputs ("};\n", fout);
+
+  return EXIT_SUCCESS;
+}