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1 | /* Measure memcpy functions with large data sizes. |
2 | Copyright (C) 2016 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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef MEMCPY_RESULT | |
20 | # define MEMCPY_RESULT(dst, len) dst | |
21 | # define START_SIZE (64 * 1024) | |
22 | # define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024) | |
23 | # define TEST_MAIN | |
24 | # define TEST_NAME "memcpy" | |
25 | # define TIMEOUT (20 * 60) | |
26 | # include "bench-string.h" | |
27 | ||
28 | IMPL (memcpy, 1) | |
29 | #endif | |
30 | ||
31 | typedef char *(*proto_t) (char *, const char *, size_t); | |
32 | ||
33 | static void | |
34 | do_one_test (impl_t *impl, char *dst, const char *src, | |
35 | size_t len) | |
36 | { | |
37 | size_t i, iters = 16; | |
38 | timing_t start, stop, cur; | |
39 | ||
40 | /* Must clear the destination buffer updated by the previous run. */ | |
41 | for (i = 0; i < len; i++) | |
42 | dst[i] = 0; | |
43 | ||
44 | if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len)) | |
45 | { | |
46 | error (0, 0, "Wrong result in function %s %p %p", impl->name, | |
47 | CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len)); | |
48 | ret = 1; | |
49 | return; | |
50 | } | |
51 | ||
52 | if (memcmp (dst, src, len) != 0) | |
53 | { | |
54 | error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"", | |
55 | impl->name, dst, src); | |
56 | ret = 1; | |
57 | return; | |
58 | } | |
59 | ||
60 | TIMING_NOW (start); | |
61 | for (i = 0; i < iters; ++i) | |
62 | { | |
63 | CALL (impl, dst, src, len); | |
64 | } | |
65 | TIMING_NOW (stop); | |
66 | ||
67 | TIMING_DIFF (cur, start, stop); | |
68 | ||
69 | TIMING_PRINT_MEAN ((double) cur, (double) iters); | |
70 | } | |
71 | ||
72 | static void | |
73 | do_test (size_t align1, size_t align2, size_t len) | |
74 | { | |
75 | size_t i, j; | |
76 | char *s1, *s2; | |
77 | ||
78 | align1 &= 63; | |
79 | if (align1 + len >= page_size) | |
80 | return; | |
81 | ||
82 | align2 &= 63; | |
83 | if (align2 + len >= page_size) | |
84 | return; | |
85 | ||
86 | s1 = (char *) (buf1 + align1); | |
87 | s2 = (char *) (buf2 + align2); | |
88 | ||
89 | for (i = 0, j = 1; i < len; i++, j += 23) | |
90 | s1[i] = j; | |
91 | ||
92 | printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); | |
93 | ||
94 | FOR_EACH_IMPL (impl, 0) | |
95 | do_one_test (impl, s2, s1, len); | |
96 | ||
97 | putchar ('\n'); | |
98 | } | |
99 | ||
100 | int | |
101 | test_main (void) | |
102 | { | |
103 | size_t i; | |
104 | ||
105 | test_init (); | |
106 | ||
107 | printf ("%23s", ""); | |
108 | FOR_EACH_IMPL (impl, 0) | |
109 | printf ("\t%s", impl->name); | |
110 | putchar ('\n'); | |
111 | ||
112 | for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) | |
113 | { | |
114 | do_test (0, 0, i + 7); | |
115 | do_test (0, 3, i + 15); | |
116 | do_test (3, 0, i + 31); | |
117 | do_test (3, 5, i + 63); | |
118 | } | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | #include "../test-skeleton.c" |