Added performance tests for UTF-8 decoding functions

https://bugzilla.gnome.org/show_bug.cgi?id=619418

glib/tests/Makefile.am

@@ -73,6 +73,10 @@ gvariant_LDADD      = $(progs_ldadd)
 TEST_PROGS         += mem-overflow
 mem_overflow_LDADD  = $(progs_ldadd)
 
+TEST_PROGS              += utf8-performance
+utf8_performance_SOURCES = utf8-performance.c
+utf8_performance_LDADD   = $(progs_ldadd)
+
 TEST_PROGS         += utils
 utils_LDADD         = $(progs_ldadd)
 

glib/tests/utf8-performance.c

@@ -0,0 +1,202 @@
+/* GLIB - Library of useful routines for C programming
+ *
+ * Copyright (C) 2010 Mikhail Zabaluev <mikhail.zabaluev@gmail.com>
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * This 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <string.h>
+
+#include <glib.h>
+
+#define NUM_ITERATIONS 500000
+
+static const char str_ascii[] =
+    "The quick brown fox jumps over the lazy dog";
+
+static const gchar str_latin1[] =
+    "Zwölf Boxkämpfer jagen Viktor quer über den großen Sylter Deich";
+
+/* Energizing GOELRO-talk in Russian, used by KDE */
+static const char str_cyrillic[] =
+    "Широкая электрификация южных губерний даст мощный толчок подъёму "
+    "сельского хозяйства.";
+
+/* First sentence from the Wikipedia article:
+ * http://zh.wikipedia.org/w/index.php?title=%E6%B1%89%E5%AD%97&oldid=13053137 */
+static const char str_chinese[] =
+    "漢字，亦稱中文字、中国字，在台灣又被稱為國字，是漢字文化圈廣泛使用的一種文字，屬於表意文字的詞素音節文字";
+
+typedef int (* GrindFunc) (const char *, gsize);
+
+static int
+grind_get_char (const char *str, gsize len)
+{
+  gunichar acc = 0;
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      const char *p = str;
+      while (*p) {
+	acc += g_utf8_get_char (p);
+	p = g_utf8_next_char (p);
+      }
+    }
+  return acc;
+}
+
+static int
+grind_get_char_validated (const char *str, gsize len)
+{
+  gunichar acc = 0;
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      const char *p = str;
+      while (*p) {
+	acc += g_utf8_get_char_validated (p, -1);
+	p = g_utf8_next_char (p);
+      }
+    }
+  return acc;
+}
+
+static int
+grind_utf8_to_ucs4 (const char *str, gsize len)
+{
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      gunichar *ustr;
+      ustr = g_utf8_to_ucs4 (str, -1, NULL, NULL, NULL);
+      g_free (ustr);
+    }
+  return 0;
+}
+
+static int
+grind_get_char_backwards (const char *str, gsize len)
+{
+  gunichar acc = 0;
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      const char *p = str + len;
+      do
+	{
+	  p = g_utf8_prev_char (p);
+	  acc += g_utf8_get_char (p);
+        }
+      while (p != str);
+    }
+  return acc;
+}
+
+static int
+grind_utf8_to_ucs4_sized (const char *str, gsize len)
+{
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      gunichar *ustr;
+      ustr = g_utf8_to_ucs4 (str, len, NULL, NULL, NULL);
+      g_free (ustr);
+    }
+  return 0;
+}
+
+static int
+grind_utf8_to_ucs4_fast (const char *str, gsize len)
+{
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      gunichar *ustr;
+      ustr = g_utf8_to_ucs4_fast (str, -1, NULL);
+      g_free (ustr);
+    }
+  return 0;
+}
+
+static int
+grind_utf8_to_ucs4_fast_sized (const char *str, gsize len)
+{
+  int i;
+  for (i = 0; i < NUM_ITERATIONS; i++)
+    {
+      gunichar *ustr;
+      ustr = g_utf8_to_ucs4_fast (str, len, NULL);
+      g_free (ustr);
+    }
+  return 0;
+}
+
+static void
+perform_for (GrindFunc grind_func, const char *str, const char *label)
+{
+  gsize len;
+  gulong bytes_ground;
+  gdouble time_elapsed;
+  gdouble result;
+
+  len = strlen (str);
+  bytes_ground = (gulong) len * NUM_ITERATIONS;
+
+  g_test_timer_start ();
+
+  grind_func (str, len);
+
+  time_elapsed = g_test_timer_elapsed ();
+
+  result = ((gdouble) bytes_ground / time_elapsed) * 1.0e-6;
+
+  g_test_maximized_result (result, "%-9s %6.1f MB/s", label, result);
+}
+
+static void
+perform (gconstpointer data)
+{
+  GrindFunc grind_func = (GrindFunc) data;
+
+  if (!g_test_perf ())
+    return;
+
+  perform_for (grind_func, str_ascii, "ASCII:");
+  perform_for (grind_func, str_latin1, "Latin-1:");
+  perform_for (grind_func, str_cyrillic, "Cyrillic:");
+  perform_for (grind_func, str_chinese, "Chinese:");
+}
+
+int
+main (int argc, char **argv)
+{
+  g_test_init (&argc, &argv, NULL);
+  g_test_add_data_func ("/utf8/perf/get_char",
+      grind_get_char, perform);
+  g_test_add_data_func ("/utf8/perf/get_char-backwards",
+      grind_get_char_backwards, perform);
+  g_test_add_data_func ("/utf8/perf/get_char_validated",
+      grind_get_char_validated, perform);
+  g_test_add_data_func ("/utf8/perf/utf8_to_ucs4",
+      grind_utf8_to_ucs4, perform);
+  g_test_add_data_func ("/utf8/perf/utf8_to_ucs4-sized",
+      grind_utf8_to_ucs4_sized, perform);
+  g_test_add_data_func ("/utf8/perf/utf8_to_ucs4_fast",
+      grind_utf8_to_ucs4_fast, perform);
+  g_test_add_data_func ("/utf8/perf/utf8_to_ucs4_fast-sized",
+      grind_utf8_to_ucs4_fast_sized, perform);
+  return g_test_run ();
+}