/* Measure strncmp 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 "wcsncmp"

#else

# define TEST_NAME "strncmp"

#endif /* !WIDE */

#include "bench-string.h"

#include "json-lib.h"

#ifdef WIDE

# include <wchar.h>

# define L(str) L##str

# define STRNCMP wcsncmp

# define SIMPLE_STRNCMP simple_wcsncmp

# define STUPID_STRNCMP stupid_wcsncmp

# define CHAR wchar_t

# define CHARBYTES 4

/* Wcsncmp uses signed semantics for comparison, not unsigned.

   Avoid using substraction since possible overflow.  */

int

simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)

{

  wchar_t c1, c2;

  while (n--)

    {

      c1 = *s1++;

      c2 = *s2++;

      if (c1 == L ('\0') || c1 != c2)

	return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);

    }

  return 0;

}

int

stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)

{

  wchar_t c1, c2;

  size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;

  n = ns1 < n ? ns1 : n;

  n = ns2 < n ? ns2 : n;

  while (n--)

    {

      c1 = *s1++;

      c2 = *s2++;

      if (c1 != c2)

	return c1 > c2 ? 1 : -1;

    }

  return 0;

}

#else

# define L(str) str

# define STRNCMP strncmp

# define SIMPLE_STRNCMP simple_strncmp

# define STUPID_STRNCMP stupid_strncmp

# define CHAR char

# define CHARBYTES 1

/* Strncmp uses unsigned semantics for comparison.  */

int

simple_strncmp (const char *s1, const char *s2, size_t n)

{

  int ret = 0;

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

	 && *s1++);

  return ret;

}

int

stupid_strncmp (const char *s1, const char *s2, size_t n)

{

  size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;

  int ret = 0;

  n = ns1 < n ? ns1 : n;

  n = ns2 < n ? ns2 : n;

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

  return ret;

}

#endif /* !WIDE */

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

IMPL (STUPID_STRNCMP, 0)

IMPL (SIMPLE_STRNCMP, 0)

IMPL (STRNCMP, 1)

static void

do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1, const CHAR

	     *s2, size_t n, 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, n);

    }

  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

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

}

static void

do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,

	       size_t n, int max_char, int exp_result)

{

  size_t i, align_n;

  CHAR *s1, *s2;

  align1 &= 15;

  align2 &= 15;

  align_n = (page_size - n * CHARBYTES) & 15;

  json_element_object_begin (json_ctx);

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

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

  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)

    {

      realloc_bufs ();

      s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);

      s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);

      if (align1 < align_n)

	s1 = (CHAR *) ((char *) s1 - (align_n - align1));

      if (align2 < align_n)

	s2 = (CHAR *) ((char *) s2 - (align_n - align2));

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

	s1[i] = s2[i] = 1 + 23 * i % max_char;

      if (len < n)

	{

	  s1[len] = 0;

	  s2[len] = 0;

	  if (exp_result < 0)

	    s2[len] = 32;

	  else if (exp_result > 0)

	    s1[len] = 64;

	}

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

    }

  json_array_end (json_ctx);

  json_element_object_end (json_ctx);

}

static void

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

	 n, int max_char, int exp_result)

{

  size_t i;

  CHAR *s1, *s2;

  if (n == 0)

    return;

  align1 &= 63;

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

    return;

  align2 &= 7;

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

    return;

  json_element_object_begin (json_ctx);

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

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

  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)

    {

      realloc_bufs ();

      s1 = (CHAR *) (buf1 + align1);

      s2 = (CHAR *) (buf2 + align2);

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

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

      s1[n] = 24 + exp_result;

      s2[n] = 23;

      s1[len] = 0;

      s2[len] = 0;

      if (exp_result < 0)

	s2[len] = 32;

      else if (exp_result > 0)

	s1[len] = 64;

      if (len >= n)

	s2[n - 1] -= exp_result;

      do_one_test (json_ctx, impl, s1, s2, n, 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 =0; i < 16; ++i)

    {

      do_test (&json_ctx, 0, 0, 8, i, 127, 0);

      do_test (&json_ctx, 0, 0, 8, i, 127, -1);

      do_test (&json_ctx, 0, 0, 8, i, 127, 1);

      do_test (&json_ctx, i, i, 8, i, 127, 0);

      do_test (&json_ctx, i, i, 8, i, 127, 1);

      do_test (&json_ctx, i, i, 8, i, 127, -1);

      do_test (&json_ctx, i, 2 * i, 8, i, 127, 0);

      do_test (&json_ctx, 2 * i, i, 8, i, 127, 1);

      do_test (&json_ctx, i, 3 * i, 8, i, 127, -1);

      do_test (&json_ctx, 0, 0, 8, i, 255, 0);

      do_test (&json_ctx, 0, 0, 8, i, 255, -1);

      do_test (&json_ctx, 0, 0, 8, i, 255, 1);

      do_test (&json_ctx, i, i, 8, i, 255, 0);

      do_test (&json_ctx, i, i, 8, i, 255, 1);

      do_test (&json_ctx, i, i, 8, i, 255, -1);

      do_test (&json_ctx, i, 2 * i, 8, i, 255, 0);

      do_test (&json_ctx, 2 * i, i, 8, i, 255, 1);

      do_test (&json_ctx, i, 3 * i, 8, i, 255, -1);

    }

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

    {

      do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 0);

      do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 1);

      do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, -1);

      do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, 0);

      do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, 1);

      do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, -1);

      do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 16 << i, 127, 0);

      do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 16 << i, 127, 1);

      do_test (&json_ctx, 2 * i, i, 8 << i, 16 << i, 255, 0);

      do_test (&json_ctx, 2 * i, i, 8 << i, 16 << i, 255, 1);

    }

  do_test_limit (&json_ctx, 4, 0, 21, 20, 127, 0);

  do_test_limit (&json_ctx, 0, 4, 21, 20, 127, 0);

  do_test_limit (&json_ctx, 8, 0, 25, 24, 127, 0);

  do_test_limit (&json_ctx, 0, 8, 25, 24, 127, 0);

  for (i = 0; i < 8; ++i)

    {

      do_test_limit (&json_ctx, 0, 0, 17 - i, 16 - i, 127, 0);

      do_test_limit (&json_ctx, 0, 0, 17 - i, 16 - i, 255, 0);

      do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, 0);

      do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, 1);

      do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, -1);

      do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, 0);

      do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, 1);

      do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, -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>