/* Measure strcmp and wcscmp functions.

   Copyright (C) 2013-2018 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 TEST_MAIN

#ifdef WIDE

# define TEST_NAME "wcscmp"

#else

# define TEST_NAME "strcmp"

#endif

#include "bench-string.h"

#ifdef WIDE

# include <wchar.h>

# define L(str) L##str

# define STRCMP wcscmp

# define STRCPY wcscpy

# define STRLEN wcslen

# define MEMCPY wmemcpy

# define SIMPLE_STRCMP simple_wcscmp

# define STUPID_STRCMP stupid_wcscmp

# define CHAR wchar_t

# define UCHAR wchar_t

# define CHARBYTES 4

# define CHARBYTESLOG 2

# define CHARALIGN __alignof__ (CHAR)

# define MIDCHAR 0x7fffffff

# define LARGECHAR 0xfffffffe

# define CHAR__MAX WCHAR_MAX

# define CHAR__MIN WCHAR_MIN

/* Wcscmp uses signed semantics for comparison, not unsigned */

/* Avoid using substraction since possible overflow */

int

simple_wcscmp (const wchar_t *s1, const wchar_t *s2)

{

  wchar_t c1, c2;

  do

    {

      c1 = *s1++;

      c2 = *s2++;

      if (c2 == L'\0')

      return c1 - c2;

    }

  while (c1 == c2);

  return c1 < c2 ? -1 : 1;

}

int

stupid_wcscmp (const wchar_t *s1, const wchar_t *s2)

{

  size_t ns1 = wcslen (s1) + 1;

  size_t ns2 = wcslen (s2) + 1;

  size_t n = ns1 < ns2 ? ns1 : ns2;

  int ret = 0;

  wchar_t c1, c2;

  while (n--) {

    c1 = *s1++;

    c2 = *s2++;

    if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0)

      break;

  }

  return ret;

}

#else

# include <limits.h>

# define L(str) str

# define STRCMP strcmp

# define STRCPY strcpy

# define STRLEN strlen

# define MEMCPY memcpy

# define SIMPLE_STRCMP simple_strcmp

# define STUPID_STRCMP stupid_strcmp

# define CHAR char

# define UCHAR unsigned char

# define CHARBYTES 1

# define CHARBYTESLOG 0

# define CHARALIGN 1

# define MIDCHAR 0x7f

# define LARGECHAR 0xfe

# define CHAR__MAX CHAR_MAX

# define CHAR__MIN CHAR_MIN

/* Strcmp uses unsigned semantics for comparison. */

int

simple_strcmp (const char *s1, const char *s2)

{

  int ret;

  while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);

  return ret;

}

int

stupid_strcmp (const char *s1, const char *s2)

{

  size_t ns1 = strlen (s1) + 1;

  size_t ns2 = strlen (s2) + 1;

  size_t n = ns1 < ns2 ? ns1 : ns2;

  int ret = 0;

  while (n--)

    if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0)

      break;

  return ret;

}

#endif

# include "json-lib.h"

typedef int (*proto_t) (const CHAR *, const CHAR *);

IMPL (STUPID_STRCMP, 1)

IMPL (SIMPLE_STRCMP, 1)

IMPL (STRCMP, 1)

static void

do_one_test (json_ctx_t *json_ctx, impl_t *impl,

	     const CHAR *s1, const CHAR *s2,

	     int exp_result)

{

  size_t i, iters = INNER_LOOP_ITERS;

  timing_t start, stop, cur;

  TIMING_NOW (start);

  for (i = 0; i < iters; ++i)

    {

      CALL (impl, s1, s2);

    }

  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

  json_element_double (json_ctx, (double) cur / (double) iters);

}

static void

do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int

	 max_char, int exp_result)

{

  size_t i;

  CHAR *s1, *s2;

  if (len == 0)

    return;

  align1 &= 63;

  if (align1 + (len + 1) * CHARBYTES >= page_size)

    return;

  align2 &= 63;

  if (align2 + (len + 1) * CHARBYTES >= page_size)

    return;

  /* Put them close to the end of page.  */

  i = align1 + CHARBYTES * (len + 2);

  s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1);

  i = align2 + CHARBYTES * (len + 2);

  s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16)  + align2);

  for (i = 0; i < len; i++)

    s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;

  s1[len] = s2[len] = 0;

  s1[len + 1] = 23;

  s2[len + 1] = 24 + exp_result;

  s2[len - 1] -= exp_result;

  json_element_object_begin (json_ctx);

  json_attr_uint (json_ctx, "length", (double) len);

  json_attr_uint (json_ctx, "align1", (double) align1);

  json_attr_uint (json_ctx, "align2", (double) align2);

  json_array_begin (json_ctx, "timings");

  FOR_EACH_IMPL (impl, 0)

    do_one_test (json_ctx, impl, s1, s2, exp_result);

  json_array_end (json_ctx);

  json_element_object_end (json_ctx);

}

int

test_main (void)

{

  json_ctx_t json_ctx;

  size_t i;

  test_init ();

  json_init (&json_ctx, 0, stdout);

  json_document_begin (&json_ctx);

  json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);

  json_attr_object_begin (&json_ctx, "functions");

  json_attr_object_begin (&json_ctx, TEST_NAME);

  json_attr_string (&json_ctx, "bench-variant", "default");

  json_array_begin (&json_ctx, "ifuncs");

  FOR_EACH_IMPL (impl, 0)

    json_element_string (&json_ctx, impl->name);

  json_array_end (&json_ctx);

  json_array_begin (&json_ctx, "results");

  for (i = 1; i < 32; ++i)

    {

      do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0);

      do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1);

      do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1);

    }

  for (i = 1; i < 10 + CHARBYTESLOG; ++i)

    {

      do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0);

      do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0);

      do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1);

      do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1);

      do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1);

      do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1);

      do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1);

      do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1);

    }

  for (i = 1; i < 8; ++i)

    {

      do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0);

      do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0);

      do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1);

      do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1);

      do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1);

      do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1);

    }

  json_array_end (&json_ctx);

  json_attr_object_end (&json_ctx);

  json_attr_object_end (&json_ctx);

  json_document_end (&json_ctx);

  return ret;

}

#include <support/test-driver.c>