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, 285 insertions, 0 deletions

diff --git a/REORG.TODO/benchtests/bench-math-inlines.c b/REORG.TODO/benchtests/bench-math-inlines.c
new file mode 100644
index 0000000000..36fde52036
--- /dev/null
+++ b/REORG.TODO/benchtests/bench-math-inlines.c
@@ -0,0 +1,285 @@
+/* Measure math inline functions.
+   Copyright (C) 2015-2017 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/>.  */
+
+#define SIZE 1024
+#define TEST_MAIN
+#define TEST_NAME "math-inlines"
+#define TEST_FUNCTION test_main ()
+#include "bench-timing.h"
+#include "json-lib.h"
+#include "bench-util.h"
+
+#include <stdlib.h>
+#include <math.h>
+#include <stdint.h>
+
+#define BOOLTEST(func)					  \
+static int __attribute__((noinline))			  \
+func ## _f (double d, int i)				  \
+{							  \
+  if (func (d))						  \
+    return (int) d + i;					  \
+  else							  \
+    return 5;						  \
+}							  \
+static int						  \
+func ## _t (volatile double *p, size_t n, size_t iters)   \
+{							  \
+  int i, j;						  \
+  int res = 0;						  \
+  for (j = 0; j < iters; j++)				  \
+    for (i = 0; i < n; i++)				  \
+      if (func ## _f (p[i] * 2.0, i) != 0)		  \
+	res += 5;					  \
+  return res;						  \
+}
+
+#define VALUETEST(func)					  \
+static int __attribute__((noinline))			  \
+func ## _f (double d)					  \
+{							  \
+  return func (d);					  \
+}							  \
+static int						  \
+func ## _t (volatile double *p, size_t n, size_t iters)	  \
+{							  \
+  int i, j;						  \
+  int res = 0;						  \
+  for (j = 0; j < iters; j++)				  \
+    for (i = 0; i < n; i++)				  \
+      res += func ## _f (p[i] * 2.0);			  \
+  return res;						  \
+}
+
+typedef union
+{
+  double value;
+  uint64_t word;
+} ieee_double_shape_type;
+
+#define EXTRACT_WORDS64(i,d)				  \
+do {							  \
+  ieee_double_shape_type gh_u;				  \
+  gh_u.value = (d);					  \
+  (i) = gh_u.word;					  \
+} while (0)
+
+/* Inlines similar to existing math_private.h versions.  */
+
+static __always_inline int
+__isnan_inl (double d)
+{
+  uint64_t di;
+  EXTRACT_WORDS64 (di, d);
+  return (di & 0x7fffffffffffffffull) > 0x7ff0000000000000ull;
+}
+
+static __always_inline int
+__isinf_ns2 (double d)
+{
+  uint64_t di;
+  EXTRACT_WORDS64 (di, d);
+  return (di & 0x7fffffffffffffffull) == 0x7ff0000000000000ull;
+}
+
+static __always_inline int
+__finite_inl (double d)
+{
+  uint64_t di;
+  EXTRACT_WORDS64 (di, d);
+  return (di & 0x7fffffffffffffffull) < 0x7ff0000000000000ull;
+}
+
+#define __isnormal_inl(X) (__fpclassify (X) == FP_NORMAL)
+
+/* Inlines for the builtin functions.  */
+
+#define __isnan_builtin(X) __builtin_isnan (X)
+#define __isinf_ns_builtin(X) __builtin_isinf (X)
+#define __isinf_builtin(X) __builtin_isinf_sign (X)
+#define __isfinite_builtin(X) __builtin_isfinite (X)
+#define __isnormal_builtin(X) __builtin_isnormal (X)
+#define __fpclassify_builtin(X) __builtin_fpclassify (FP_NAN, FP_INFINITE,  \
+				  FP_NORMAL, FP_SUBNORMAL, FP_ZERO, (X))
+
+static double __attribute ((noinline))
+kernel_standard (double x, double y, int z)
+{
+  return x * y + z;
+}
+
+volatile double rem1 = 2.5;
+
+static __always_inline double
+remainder_test1 (double x)
+{
+  double y = rem1;
+  if (((__builtin_expect (y == 0.0, 0) && !__isnan_inl (x))
+	|| (__builtin_expect (__isinf_ns2 (x), 0) && !__isnan_inl (y))))
+    return kernel_standard (x, y, 10);
+
+  return remainder (x, y);
+}
+
+static __always_inline double
+remainder_test2 (double x)
+{
+  double y = rem1;
+  if (((__builtin_expect (y == 0.0, 0) && !__builtin_isnan (x))
+	|| (__builtin_expect (__builtin_isinf (x), 0) && !__builtin_isnan (y))))
+    return kernel_standard (x, y, 10);
+
+  return remainder (x, y);
+}
+
+/* Create test functions for each possibility.  */
+
+BOOLTEST (__isnan)
+BOOLTEST (__isnan_inl)
+BOOLTEST (__isnan_builtin)
+BOOLTEST (isnan)
+
+BOOLTEST (__isinf)
+BOOLTEST (__isinf_builtin)
+BOOLTEST (__isinf_ns2)
+BOOLTEST (__isinf_ns_builtin)
+BOOLTEST (isinf)
+
+BOOLTEST (__finite)
+BOOLTEST (__finite_inl)
+BOOLTEST (__isfinite_builtin)
+BOOLTEST (isfinite)
+
+BOOLTEST (__isnormal_inl)
+BOOLTEST (__isnormal_builtin)
+BOOLTEST (isnormal)
+
+VALUETEST (__fpclassify)
+VALUETEST (__fpclassify_builtin)
+VALUETEST (fpclassify)
+
+VALUETEST (remainder_test1)
+VALUETEST (remainder_test2)
+
+typedef int (*proto_t) (volatile double *p, size_t n, size_t iters);
+
+typedef struct
+{
+  const char *name;
+  proto_t fn;
+} impl_t;
+
+#define IMPL(name) { #name, name ## _t }
+
+static impl_t test_list[] =
+{
+  IMPL (__isnan),
+  IMPL (__isnan_inl),
+  IMPL (__isnan_builtin),
+  IMPL (isnan),
+
+  IMPL (__isinf),
+  IMPL (__isinf_ns2),
+  IMPL (__isinf_ns_builtin),
+  IMPL (__isinf_builtin),
+  IMPL (isinf),
+
+  IMPL (__finite),
+  IMPL (__finite_inl),
+  IMPL (__isfinite_builtin),
+  IMPL (isfinite),
+
+  IMPL (__isnormal_inl),
+  IMPL (__isnormal_builtin),
+  IMPL (isnormal),
+
+  IMPL (__fpclassify),
+  IMPL (__fpclassify_builtin),
+  IMPL (fpclassify),
+
+  IMPL (remainder_test1),
+  IMPL (remainder_test2)
+};
+
+static void
+do_one_test (json_ctx_t *json_ctx, proto_t test_fn, volatile double *arr,
+	     size_t len, const char *testname)
+{
+  size_t iters = 500;
+  timing_t start, stop, cur;
+
+  json_attr_object_begin (json_ctx, testname);
+
+  TIMING_NOW (start);
+  test_fn (arr, len, iters);
+  TIMING_NOW (stop);
+  TIMING_DIFF (cur, start, stop);
+
+  json_attr_double (json_ctx, "duration", cur);
+  json_attr_double (json_ctx, "iterations", iters);
+  json_attr_double (json_ctx, "mean", cur / iters);
+  json_attr_object_end (json_ctx);
+}
+
+static volatile double arr1[SIZE];
+static volatile double arr2[SIZE];
+
+int
+test_main (void)
+{
+  json_ctx_t json_ctx;
+  size_t i;
+
+  bench_start ();
+
+  json_init (&json_ctx, 2, stdout);
+  json_attr_object_begin (&json_ctx, TEST_NAME);
+
+  /* Create 2 test arrays, one with 10% zeroes, 10% negative values,
+     79% positive values and 1% infinity/NaN.  The other contains
+     50% inf, 50% NaN.  This relies on rand behaving correctly.  */
+
+  for (i = 0; i < SIZE; i++)
+    {
+      int x = rand () & 255;
+      arr1[i] = (x < 25) ? 0.0 : ((x < 50) ? -1 : 100);
+      if (x == 255) arr1[i] = __builtin_inf ();
+      if (x == 254) arr1[i] = __builtin_nan ("0");
+      arr2[i] = (x < 128) ? __builtin_inf () : __builtin_nan ("0");
+    }
+
+  for (i = 0; i < sizeof (test_list) / sizeof (test_list[0]); i++)
+    {
+      json_attr_object_begin (&json_ctx, test_list[i].name);
+      do_one_test (&json_ctx, test_list[i].fn, arr2, SIZE, "inf/nan");
+      json_attr_object_end (&json_ctx);
+    }
+
+  for (i = 0; i < sizeof (test_list) / sizeof (test_list[0]); i++)
+    {
+      json_attr_object_begin (&json_ctx, test_list[i].name);
+      do_one_test (&json_ctx, test_list[i].fn, arr1, SIZE, "normal");
+      json_attr_object_end (&json_ctx);
+    }
+
+  json_attr_object_end (&json_ctx);
+  return 0;
+}
+
+#include "bench-util.c"
+#include "../test-skeleton.c"