Actually add bench-memcpy-random

git-add and commit the benchmark that Wilco posted on the list.

1 files changed, 157 insertions, 0 deletions

diff --git a/benchtests/bench-memcpy-random.c b/benchtests/bench-memcpy-random.c
new file mode 100644
index 0000000000..4cd620966d
--- /dev/null
+++ b/benchtests/bench-memcpy-random.c
@@ -0,0 +1,157 @@
+/* Measure memcpy performance.
+   Copyright (C) 2016-2017 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 MIN_PAGE_SIZE 131072
+#define TEST_MAIN
+#define TEST_NAME "memcpy-random"
+#include "bench-string.h"
+#include <assert.h>
+
+IMPL (memcpy, 0)
+
+#define NUM_COPIES 4096
+
+typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
+typedef struct { uint8_t align; uint8_t freq; } align_data_t;
+
+#define SIZE_NUM 1024
+#define SIZE_MASK (SIZE_NUM-1)
+static uint8_t size_arr[SIZE_NUM];
+
+/* Frequency data for memcpy of less than 256 bytes based on SPEC2006.  */
+static freq_data_t size_freq[] =
+{
+  {  8, 576}, {104,  94}, { 24,  78}, { 48,  58}, { 32,  48}, { 16,  46},
+  {  1,  30}, { 96,  12}, { 72,  11}, {216,  11}, {192,   8}, { 12,   7},
+  {144,   5}, {  2,   4}, { 64,   4}, {120,   4}, {  4,   3}, { 40,   2},
+  {  7,   2}, {168,   2}, {160,   2}, {128,   1}, {  3,   1}, {  9,   1},
+  {176,   1}, {240,   1}, { 11,   1}, {  0,   1}, {  5,   1}, {  6,   1},
+  { 80,   1}, { 52,   1}, {152,   1}, { 10,   1}, { 56,   1}, { 51,   1},
+  { 14,   1}, {208,   1}, {  0,   0}
+};
+
+#define ALIGN_NUM 256
+#define ALIGN_MASK (ALIGN_NUM-1)
+static uint8_t src_align_arr[ALIGN_NUM];
+static uint8_t dst_align_arr[ALIGN_NUM];
+
+/* Source alignment frequency for memcpy based on SPEC2006.  */
+static align_data_t src_align_freq[] =
+{
+  {16, 144}, {8, 86}, {3, 23}, {1, 3}, {0, 0}
+};
+
+/* Destination alignment frequency for memcpy based on SPEC2006.  */
+static align_data_t dst_align_freq[] =
+{
+  {16, 197}, {8, 30}, {3, 23}, {1, 6}, {0, 0}
+};
+
+typedef struct
+{
+  uint16_t src;
+  uint16_t dst;
+  uint16_t len;
+} copy_t;
+
+static copy_t copy[NUM_COPIES];
+
+typedef char *(*proto_t) (char *, const char *, size_t);
+
+static void
+init_copy_distribution (void)
+{
+  int i, j, freq, size, n;
+
+  for (n = i = 0; (freq = size_freq[i].freq) != 0; i++)
+    for (j = 0, size = size_freq[i].size; j < freq; j++)
+      size_arr[n++] = size;
+  assert (n == SIZE_NUM);
+
+  for (n = i = 0; (freq = src_align_freq[i].freq) != 0; i++)
+    for (j = 0, size = src_align_freq[i].align; j < freq; j++)
+      src_align_arr[n++] = size - 1;
+  assert (n == ALIGN_NUM);
+
+  for (n = i = 0; (freq = dst_align_freq[i].freq) != 0; i++)
+    for (j = 0, size = dst_align_freq[i].align; j < freq; j++)
+      dst_align_arr[n++] = size - 1;
+  assert (n == ALIGN_NUM);
+}
+
+
+static void
+do_one_test (impl_t *impl, char *dst, char *src, copy_t *copy, size_t n)
+{
+  timing_t start, stop, cur;
+  size_t iters = INNER_LOOP_ITERS * 20;
+
+  TIMING_NOW (start);
+  for (int i = 0; i < iters; ++i)
+    for (int j = 0; j < n; j++)
+      CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
+  TIMING_NOW (stop);
+
+  TIMING_DIFF (cur, start, stop);
+
+  TIMING_PRINT_MEAN ((double) cur, (double) iters);
+}
+
+static void
+do_test (size_t max_size)
+{
+  for (int i = 0; i < max_size; i++)
+    buf1[i] = i * 3;
+
+  /* Create a random set of copies with the given size and alignment
+     distributions.  */
+  for (int i = 0; i < NUM_COPIES; i++)
+    {
+      copy[i].dst = (rand () & (max_size - 1)) | 1;
+      copy[i].dst &= ~dst_align_arr[rand () & ALIGN_MASK];
+      copy[i].src = (rand () & (max_size - 1)) | 3;
+      copy[i].src &= ~src_align_arr[rand () & ALIGN_MASK];
+      copy[i].len = size_arr[rand () & SIZE_MASK];
+    }
+
+  printf ("Memory size %6zd:", max_size);
+
+  FOR_EACH_IMPL (impl, 0)
+    do_one_test (impl, (char *) buf2, (char *) buf1, copy, NUM_COPIES);
+
+  putchar ('\n');
+}
+
+int
+test_main (void)
+{
+  test_init ();
+  init_copy_distribution ();
+
+  printf ("%23s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+  for (int i = 4; i <= 64; i = i * 2)
+    do_test (i * 1024);
+
+  return ret;
+}
+
+#include <support/test-driver.c>