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, 188 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/powerpc/fpu/e_rem_pio2f.c b/REORG.TODO/sysdeps/powerpc/fpu/e_rem_pio2f.c
new file mode 100644
index 0000000000..8563e7c5e4
--- /dev/null
+++ b/REORG.TODO/sysdeps/powerpc/fpu/e_rem_pio2f.c
@@ -0,0 +1,188 @@
+/* e_rem_pio2f.c -- float version of e_rem_pio2.c
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <math.h>
+
+#include <math_private.h>
+#include "s_float_bitwise.h"
+
+/* defined in sysdeps/powerpc/fpu/k_rem_pio2f.c */
+int __fp_kernel_rem_pio2f (float *x, float *y, float e0, int32_t nx);
+
+/* __ieee754_rem_pio2f(x,y)
+ *
+ * return the remainder of x rem pi/2 in y[0]+y[1]
+ */
+
+static const float npio2_hw[] = {
+  1.57077026e+00, 3.14154053e+00, 4.71228027e+00, 6.28308105e+00,
+  7.85388184e+00, 9.42456055e+00, 1.09953613e+01, 1.25661621e+01,
+  1.41369629e+01, 1.57077637e+01, 1.72783203e+01, 1.88491211e+01,
+  2.04199219e+01, 2.19907227e+01, 2.35615234e+01, 2.51323242e+01,
+  2.67031250e+01, 2.82739258e+01, 2.98447266e+01, 3.14155273e+01,
+  3.29863281e+01, 3.45566406e+01, 3.61279297e+01, 3.76982422e+01,
+  3.92695312e+01, 4.08398438e+01, 4.24111328e+01, 4.39814453e+01,
+  4.55527344e+01, 4.71230469e+01, 4.86943359e+01, 5.02646484e+01
+};
+
+
+static const float zero  = 0.0000000000e+00;
+static const float two8  = 2.5600000000e+02;
+
+static const float half    = 5.0000000000e-01;
+static const float invpio2 = 6.3661980629e-01;
+static const float pio2_1  = 1.5707855225e+00;
+static const float pio2_1t = 1.0804334124e-05;
+static const float pio2_2  = 1.0804273188e-05;
+static const float pio2_2t = 6.0770999344e-11;
+static const float pio2_3  = 6.0770943833e-11;
+static const float pio2_3t = 6.1232342629e-17;
+
+static const float pio4     = 7.8539801e-01;
+static const float pio3_4   = 2.3561945e+00;
+static const float pio2_24b = 1.5707951e+00;
+static const float pio2_2e7 = 2.0106054e+02;
+
+
+int32_t
+__ieee754_rem_pio2f (float x, float *y)
+{
+  float ax, z, n, r, w, t, e0;
+  float tx[3];
+  int32_t i, nx;
+
+  ax = __builtin_fabsf (x);
+  if (ax <= pio4)
+    {
+      y[0] = x;
+      y[1] = 0;
+      return 0;
+    }
+  if (ax < pio3_4)
+    {
+      if (x > 0)
+	{
+	  z = x - pio2_1;
+	  if (!__float_and_test28 (ax, pio2_24b))
+	    {
+	      y[0] = z - pio2_1t;
+	      y[1] = (z - y[0]) - pio2_1t;
+	    }
+	  else
+	    {
+	      z -= pio2_2;
+	      y[0] = z - pio2_2t;
+	      y[1] = (z - y[0]) - pio2_2t;
+	    }
+	  return 1;
+	}
+      else
+	{
+	  z = x + pio2_1;
+	  if (!__float_and_test28 (ax, pio2_24b))
+	    {
+	      y[0] = z + pio2_1t;
+	      y[1] = (z - y[0]) + pio2_1t;
+	    }
+	  else
+	    {
+	      z += pio2_2;
+	      y[0] = z + pio2_2t;
+	      y[1] = (z - y[0]) + pio2_2t;
+	    }
+	  return -1;
+	}
+    }
+  if (ax <= pio2_2e7)
+    {
+      n = __floorf (ax * invpio2 + half);
+      i = (int32_t) n;
+      r = ax - n * pio2_1;
+      w = n * pio2_1t;		/* 1st round good to 40 bit */
+      if (i < 32 && !__float_and_test24 (ax, npio2_hw[i - 1]))
+	{
+	  y[0] = r - w;
+	}
+      else
+	{
+	  float i, j;
+	  j = __float_and8 (ax);
+	  y[0] = r - w;
+	  i = __float_and8 (y[0]);
+	  if (j / i > 256.0 || j / i < 3.9062500e-3)
+	    {			/* 2nd iterations needed, good to 57 */
+	      t = r;
+	      w = n * pio2_2;
+	      r = t - w;
+	      w = n * pio2_2t - ((t - r) - w);
+	      y[0] = r - w;
+	      i = __float_and8 (y[0]);
+	      if (j / i > 33554432 || j / i < 2.9802322e-8)
+		{		/* 3rd iteration needed, 74 bits acc */
+		  t = r;
+		  w = n * pio2_3;
+		  r = t - w;
+		  w = n * pio2_3t - ((t - r) - w);
+		  y[0] = r - w;
+		}
+	    }
+	}
+      y[1] = (r - y[0]) - w;
+      if (x < 0)
+	{
+	  y[0] = -y[0];
+	  y[1] = -y[1];
+	  return -i;
+	}
+      else
+	{
+	  return i;
+	}
+    }
+
+  /* all other (large) arguments */
+  if (isnanf (x) || isinff (x))
+    {
+      y[0] = y[1] = x - x;
+      return 0;
+    }
+
+  /* set z = scalbn(|x|,ilogb(x)-7) */
+  e0 = __float_and8 (ax / 128.0);
+  z = ax / e0;
+
+  tx[0] = __floorf (z);
+  z = (z - tx[0]) * two8;
+  tx[1] = __floorf (z);
+  z = (z - tx[1]) * two8;
+  tx[2] = __floorf (z);
+
+  nx = 3;
+  while (tx[nx - 1] == zero)
+    nx--;
+
+  i = __fp_kernel_rem_pio2f (tx, y, e0, nx);
+  if (x < 0)
+    {
+      y[0] = -y[0];
+      y[1] = -y[1];
+      return -i;
+    }
+  return i;
+}