/* Measure memset function throughput with large data sizes.

   Copyright (C) 2017-2018 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

#ifndef WIDE

# define TEST_NAME "memset"

#else

# define TEST_NAME "wmemset"

#endif /* WIDE */

#define START_SIZE 128

#define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)

#define TIMEOUT (20 * 60)

#include "bench-string.h"

#ifndef WIDE

# define MEMSET memset

# define CHAR char

# define SIMPLE_MEMSET simple_memset

# define MEMCMP memcmp

#else

# include <wchar.h>

# define MEMSET wmemset

# define CHAR wchar_t

# define SIMPLE_MEMSET simple_wmemset

# define MEMCMP wmemcmp

#endif /* WIDE */

#include <assert.h>

#include "json-lib.h"

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

CHAR *

inhibit_loop_to_libcall

SIMPLE_MEMSET (CHAR *s, int c, size_t n)

{

  CHAR *r = s, *end = s + n;

  while (r < end)

    *r++ = c;

  return s;

}

IMPL (SIMPLE_MEMSET, 1)

static void

do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,

	     int c __attribute ((unused)), size_t n)

{

  size_t i, iters = MIN_PAGE_SIZE / n;

  timing_t start, stop, cur;

  TIMING_NOW (start);

  for (i = 0; i < iters && s <= s_end; s_end -= n, i++)

    CALL (impl, s, c, n);

  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

  /* Get time taken per function call.  */

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

}

static void

do_test (json_ctx_t *json_ctx, int c, size_t len)

{

  json_element_object_begin (json_ctx);

  json_attr_uint (json_ctx, "length", len);

  json_attr_uint (json_ctx, "char", c);

  json_array_begin (json_ctx, "timings");

  FOR_EACH_IMPL (impl, 0)

    {

      do_one_test (json_ctx, impl, (CHAR *) buf1,

		   (CHAR *) buf1 + MIN_PAGE_SIZE - len, c, len);

      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", "walk");

  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 = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)

      /* Test length alignments from 0-16 bytes.  */

      for (int j = 0; j < i && j < 16; j++)

	do_test (&json_ctx, 65, i + j);

  for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)

      for (int j = 0; j < i && j < 16; j++)

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

  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>