/* Measure memcmp 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 "wmemcmp"

#else

# define TEST_NAME "memcmp"

#endif

#include "bench-string.h"

#ifdef WIDE

# include <inttypes.h>

# include <wchar.h>

# define MEMCMP wmemcmp

# define MEMCPY wmemcpy

# define SIMPLE_MEMCMP simple_wmemcmp

# define CHAR wchar_t

# define UCHAR wchar_t

# define CHARBYTES 4

# define CHAR__MIN WCHAR_MIN

# define CHAR__MAX WCHAR_MAX

int

simple_wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n)

{

  int ret = 0;

  /* Warning!

	wmemcmp has to use SIGNED comparison for elements.

	memcmp has to use UNSIGNED comparison for elemnts.

  */

  while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}

  return ret;

}

#else

# include <limits.h>

# define MEMCMP memcmp

# define MEMCPY memcpy

# define SIMPLE_MEMCMP simple_memcmp

# define CHAR char

# define MAX_CHAR 255

# define UCHAR unsigned char

# define CHARBYTES 1

# define CHAR__MIN CHAR_MIN

# define CHAR__MAX CHAR_MAX

int

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

{

  int ret = 0;

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

  return ret;

}

#endif

# include "json-lib.h"

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

IMPL (SIMPLE_MEMCMP, 0)

IMPL (MEMCMP, 1)

static void

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

	     const CHAR *s2, size_t len, 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, len);

    }

  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 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;

  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)

    {

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

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

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

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

      s1[len] = align1;

      s2[len] = align2;

      s2[len - 1] -= exp_result;

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

      realloc_bufs ();

    }

  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 < 16; ++i)

    {

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

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

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

    }

  for (i = 0; i < 16; ++i)

    {

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

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

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

    }

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

    {

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

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

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

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

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

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

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

    }

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

    {

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

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

      do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -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>