1 | /* Measure memcmp functions. |
2 | Copyright (C) 2013-2022 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 TEST_MEMCMPEQ |
21 | # define TEST_NAME "__memcmpeq" |
22 | # define SIMPLE_MEMCMP simple_memcmpeq |
23 | #elif defined WIDE |
24 | # define TEST_NAME "wmemcmp" |
25 | # define SIMPLE_MEMCMP simple_wmemcmp |
26 | #else |
27 | # define TEST_NAME "memcmp" |
28 | # define SIMPLE_MEMCMP simple_memcmp |
29 | #endif |
30 | #include "bench-string.h" |
31 | #ifdef WIDE |
32 | |
33 | int |
34 | SIMPLE_MEMCMP (const wchar_t *s1, const wchar_t *s2, size_t n) |
35 | { |
36 | int ret = 0; |
37 | /* Warning! |
38 | wmemcmp has to use SIGNED comparison for elements. |
39 | memcmp has to use UNSIGNED comparison for elemnts. |
40 | */ |
41 | while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;} |
42 | return ret; |
43 | } |
44 | #else |
45 | # include <limits.h> |
46 | |
47 | int |
48 | SIMPLE_MEMCMP (const char *s1, const char *s2, size_t n) |
49 | { |
50 | int ret = 0; |
51 | |
52 | while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0); |
53 | return ret; |
54 | } |
55 | #endif |
56 | |
57 | # include "json-lib.h" |
58 | |
59 | typedef int (*proto_t) (const CHAR *, const CHAR *, size_t); |
60 | |
61 | IMPL (SIMPLE_MEMCMP, 0) |
62 | IMPL (MEMCMP, 1) |
63 | |
64 | static void |
65 | do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1, |
66 | const CHAR *s2, size_t len, int exp_result) |
67 | { |
68 | size_t i, iters = INNER_LOOP_ITERS_LARGE; |
69 | timing_t start, stop, cur; |
70 | |
71 | TIMING_NOW (start); |
72 | for (i = 0; i < iters; ++i) |
73 | { |
74 | CALL (impl, s1, s2, len); |
75 | } |
76 | TIMING_NOW (stop); |
77 | |
78 | TIMING_DIFF (cur, start, stop); |
79 | |
80 | json_element_double (ctx: json_ctx, d: (double) cur / (double) iters); |
81 | } |
82 | |
83 | static void |
84 | do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, |
85 | int exp_result) |
86 | { |
87 | size_t i; |
88 | CHAR *s1, *s2; |
89 | |
90 | if (len == 0) |
91 | return; |
92 | |
93 | align1 &= (4096 - CHARBYTES); |
94 | if (align1 + (len + 1) * CHARBYTES >= page_size) |
95 | return; |
96 | |
97 | align2 &= (4096 - CHARBYTES); |
98 | if (align2 + (len + 1) * CHARBYTES >= page_size) |
99 | return; |
100 | |
101 | json_element_object_begin (ctx: json_ctx); |
102 | json_attr_uint (ctx: json_ctx, name: "length" , d: (double) len); |
103 | json_attr_uint (ctx: json_ctx, name: "align1" , d: (double) align1); |
104 | json_attr_uint (ctx: json_ctx, name: "align2" , d: (double) align2); |
105 | json_attr_uint (ctx: json_ctx, name: "result" , d: (double) exp_result); |
106 | json_array_begin (ctx: json_ctx, name: "timings" ); |
107 | |
108 | s1 = (CHAR *)(buf1 + align1); |
109 | s2 = (CHAR *)(buf2 + align2); |
110 | |
111 | for (i = 0; i < len; i++) |
112 | s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % MAX_CHAR; |
113 | |
114 | s1[len] = align1; |
115 | s2[len] = align2; |
116 | s2[len - 1] -= exp_result; |
117 | |
118 | FOR_EACH_IMPL (impl, 0) |
119 | { |
120 | do_one_test (json_ctx, impl, s1, s2, len, exp_result); |
121 | } |
122 | |
123 | json_array_end (ctx: json_ctx); |
124 | json_element_object_end (ctx: json_ctx); |
125 | } |
126 | |
127 | int |
128 | test_main (void) |
129 | { |
130 | json_ctx_t json_ctx; |
131 | size_t i; |
132 | |
133 | test_init (); |
134 | |
135 | json_init (ctx: &json_ctx, indent_level: 0, stdout); |
136 | |
137 | json_document_begin (ctx: &json_ctx); |
138 | json_attr_string (ctx: &json_ctx, name: "timing_type" , TIMING_TYPE); |
139 | |
140 | json_attr_object_begin (ctx: &json_ctx, name: "functions" ); |
141 | json_attr_object_begin (ctx: &json_ctx, TEST_NAME); |
142 | json_attr_string (ctx: &json_ctx, name: "bench-variant" , s: "default" ); |
143 | |
144 | json_array_begin (ctx: &json_ctx, name: "ifuncs" ); |
145 | FOR_EACH_IMPL (impl, 0) |
146 | json_element_string (ctx: &json_ctx, s: impl->name); |
147 | json_array_end (ctx: &json_ctx); |
148 | |
149 | json_array_begin (ctx: &json_ctx, name: "results" ); |
150 | for (i = 1; i < 32; ++i) |
151 | { |
152 | do_test (json_ctx: &json_ctx, align1: i * CHARBYTES, align2: i * CHARBYTES, len: i, exp_result: 0); |
153 | do_test (json_ctx: &json_ctx, align1: i * CHARBYTES, align2: i * CHARBYTES, len: i, exp_result: 1); |
154 | do_test (json_ctx: &json_ctx, align1: i * CHARBYTES, align2: i * CHARBYTES, len: i, exp_result: -1); |
155 | } |
156 | |
157 | for (i = 0; i < 32; ++i) |
158 | { |
159 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: i, exp_result: 0); |
160 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: i, exp_result: 1); |
161 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: i, exp_result: -1); |
162 | do_test (json_ctx: &json_ctx, align1: 4096 - i, align2: 0, len: i, exp_result: 0); |
163 | do_test (json_ctx: &json_ctx, align1: 4096 - i, align2: 0, len: i, exp_result: 1); |
164 | do_test (json_ctx: &json_ctx, align1: 4096 - i, align2: 0, len: i, exp_result: -1); |
165 | } |
166 | |
167 | for (i = 33; i < 385; i += 32) |
168 | { |
169 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: i, exp_result: 0); |
170 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: i, exp_result: 1); |
171 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: i, exp_result: -1); |
172 | do_test (json_ctx: &json_ctx, align1: i, align2: 0, len: i, exp_result: 0); |
173 | do_test (json_ctx: &json_ctx, align1: 0, align2: i, len: i, exp_result: 1); |
174 | do_test (json_ctx: &json_ctx, align1: i, align2: i, len: i, exp_result: -1); |
175 | } |
176 | |
177 | for (i = 1; i < 10; ++i) |
178 | { |
179 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: 2 << i, exp_result: 0); |
180 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: 2 << i, exp_result: 1); |
181 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: 2 << i, exp_result: -1); |
182 | do_test (json_ctx: &json_ctx, align1: (8 - i) * CHARBYTES, align2: (2 * i) * CHARBYTES, len: 16 << i, exp_result: 0); |
183 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: 16 << i, exp_result: 0); |
184 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: 16 << i, exp_result: 1); |
185 | do_test (json_ctx: &json_ctx, align1: 0, align2: 0, len: 16 << i, exp_result: -1); |
186 | do_test (json_ctx: &json_ctx, align1: i, align2: 0, len: 2 << i, exp_result: 0); |
187 | do_test (json_ctx: &json_ctx, align1: 0, align2: i, len: 2 << i, exp_result: 1); |
188 | do_test (json_ctx: &json_ctx, align1: i, align2: i, len: 2 << i, exp_result: -1); |
189 | do_test (json_ctx: &json_ctx, align1: i, align2: 0, len: 16 << i, exp_result: 0); |
190 | do_test (json_ctx: &json_ctx, align1: 0, align2: i, len: 16 << i, exp_result: 1); |
191 | do_test (json_ctx: &json_ctx, align1: i, align2: i, len: 16 << i, exp_result: -1); |
192 | } |
193 | |
194 | for (i = 1; i < 10; ++i) |
195 | { |
196 | do_test (json_ctx: &json_ctx, align1: i * CHARBYTES, align2: 2 * (i * CHARBYTES), len: 8 << i, exp_result: 0); |
197 | do_test (json_ctx: &json_ctx, align1: i * CHARBYTES, align2: 2 * (i * CHARBYTES), len: 8 << i, exp_result: 1); |
198 | do_test (json_ctx: &json_ctx, align1: i * CHARBYTES, align2: 2 * (i * CHARBYTES), len: 8 << i, exp_result: -1); |
199 | } |
200 | |
201 | json_array_end (ctx: &json_ctx); |
202 | json_attr_object_end (ctx: &json_ctx); |
203 | json_attr_object_end (ctx: &json_ctx); |
204 | json_document_end (ctx: &json_ctx); |
205 | |
206 | return ret; |
207 | } |
208 | |
209 | #include <support/test-driver.c> |
210 | |