1/* Measure bzero functions.
2 Copyright (C) 2022-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#define TEST_MAIN
20#ifdef DO_MEMSET
21# define TEST_NAME "memset"
22#else
23# define TEST_NAME "bzero"
24#endif
25#define MIN_PAGE_SIZE 131072
26#include "bench-string.h"
27
28#include "json-lib.h"
29
30#ifdef DO_MEMSET
31void *generic_memset (void *, int, size_t);
32
33typedef void *(*proto_t) (void *, int, size_t);
34
35IMPL (memset, 1)
36IMPL (generic_memset, 0)
37
38#else
39static void
40memset_zero (void * s, size_t len)
41{
42 memset (s, '\0', len);
43}
44
45typedef void (*proto_t) (void *, size_t);
46
47IMPL (bzero, 1)
48IMPL (memset_zero, 0)
49#endif
50
51static void
52do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
53{
54 size_t i, iters = INNER_LOOP_ITERS8;
55 timing_t start, stop, cur;
56
57 TIMING_NOW (start);
58 for (i = 0; i < iters; ++i)
59 {
60#ifdef DO_MEMSET
61 CALL (impl, s, 0, n);
62#else
63 CALL (impl, s, n);
64#endif
65 }
66 TIMING_NOW (stop);
67
68 TIMING_DIFF (cur, start, stop);
69
70 json_element_double (ctx: json_ctx, d: (double) cur / (double) iters);
71}
72
73static void
74do_test (json_ctx_t *json_ctx, size_t align, size_t len)
75{
76 align &= 4095;
77 if ((align + len) * sizeof (CHAR) > page_size)
78 return;
79
80 json_element_object_begin (ctx: json_ctx);
81 json_attr_uint (ctx: json_ctx, name: "length", d: len);
82 json_attr_uint (ctx: json_ctx, name: "alignment", d: align);
83 json_array_begin (ctx: json_ctx, name: "timings");
84
85 FOR_EACH_IMPL (impl, 0)
86 {
87 do_one_test (json_ctx, impl, s: (CHAR *) (buf1) + align, n: len);
88 }
89
90 json_array_end (ctx: json_ctx);
91 json_element_object_end (ctx: json_ctx);
92}
93
94int
95test_main (void)
96{
97 json_ctx_t json_ctx;
98 size_t i;
99
100 test_init ();
101 alloc_bufs ();
102 json_init (ctx: &json_ctx, indent_level: 0, stdout);
103
104 json_document_begin (ctx: &json_ctx);
105 json_attr_string (ctx: &json_ctx, name: "timing_type", TIMING_TYPE);
106
107 json_attr_object_begin (ctx: &json_ctx, name: "functions");
108 json_attr_object_begin (ctx: &json_ctx, TEST_NAME);
109 json_attr_string (ctx: &json_ctx, name: "bench-variant", s: "default");
110
111 json_array_begin (ctx: &json_ctx, name: "ifuncs");
112 FOR_EACH_IMPL (impl, 0)
113 json_element_string (ctx: &json_ctx, s: impl->name);
114 json_array_end (ctx: &json_ctx);
115
116 json_array_begin (ctx: &json_ctx, name: "results");
117
118 for (i = 0; i < 18; ++i)
119 do_test (json_ctx: &json_ctx, align: 0, len: 1 << i);
120 for (i = 0; i < 64; ++i)
121 {
122 do_test (json_ctx: &json_ctx, align: i, len: i);
123 do_test (json_ctx: &json_ctx, align: 4096 - i, len: i);
124 do_test (json_ctx: &json_ctx, align: 4095, len: i);
125 if (i & (i - 1))
126 do_test (json_ctx: &json_ctx, align: 0, len: i);
127 }
128 for (i = 32; i < 1024; i+=32)
129 {
130 do_test (json_ctx: &json_ctx, align: 0, len: i);
131 do_test (json_ctx: &json_ctx, align: i, len: i);
132 }
133 do_test (json_ctx: &json_ctx, align: 1, len: 14);
134 do_test (json_ctx: &json_ctx, align: 3, len: 1024);
135 do_test (json_ctx: &json_ctx, align: 4, len: 64);
136 do_test (json_ctx: &json_ctx, align: 2, len: 25);
137
138 for (i = 33; i <= 256; i += 4)
139 {
140 do_test (json_ctx: &json_ctx, align: 0, len: 32 * i);
141 do_test (json_ctx: &json_ctx, align: i, len: 32 * i);
142 }
143
144 json_array_end (ctx: &json_ctx);
145 json_attr_object_end (ctx: &json_ctx);
146 json_attr_object_end (ctx: &json_ctx);
147 json_document_end (ctx: &json_ctx);
148
149 return ret;
150}
151
152#include <support/test-driver.c>
153
154#ifdef DO_MEMSET
155# define libc_hidden_builtin_def(X)
156# define libc_hidden_def(X)
157# define libc_hidden_weak(X)
158# define weak_alias(X,Y)
159# undef MEMSET
160# define MEMSET generic_memset
161# include <string/memset.c>
162#endif
163

source code of glibc/benchtests/bench-bzero.c