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Diffstat (limited to 'REORG.TODO/benchtests/bench-strncpy.c')
| -rw-r--r-- | REORG.TODO/benchtests/bench-strncpy.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/REORG.TODO/benchtests/bench-strncpy.c b/REORG.TODO/benchtests/bench-strncpy.c new file mode 100644 index 0000000000..41d3575104 --- /dev/null +++ b/REORG.TODO/benchtests/bench-strncpy.c @@ -0,0 +1,210 @@ +/* Measure strncpy functions. + Copyright (C) 2013-2017 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/>. */ + +#ifdef WIDE +# include <wchar.h> +# define CHAR wchar_t +# define UCHAR wchar_t +# define BIG_CHAR WCHAR_MAX +# define SMALL_CHAR 1273 +# define MEMCMP wmemcmp +# define MEMSET wmemset +# define STRNLEN wcsnlen +#else +# define CHAR char +# define UCHAR unsigned char +# define BIG_CHAR CHAR_MAX +# define SMALL_CHAR 127 +# define MEMCMP memcmp +# define MEMSET memset +# define STRNLEN strnlen +#endif /* !WIDE */ + + +#ifndef STRNCPY_RESULT +# define STRNCPY_RESULT(dst, len, n) dst +# define TEST_MAIN +# ifndef WIDE +# define TEST_NAME "strncpy" +# else +# define TEST_NAME "wcsncpy" +# endif /* WIDE */ +# include "bench-string.h" +# ifndef WIDE +# define SIMPLE_STRNCPY simple_strncpy +# define STUPID_STRNCPY stupid_strncpy +# define STRNCPY strncpy +# else +# define SIMPLE_STRNCPY simple_wcsncpy +# define STUPID_STRNCPY stupid_wcsncpy +# define STRNCPY wcsncpy +# endif /* WIDE */ + +CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t); +CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t); + +IMPL (STUPID_STRNCPY, 0) +IMPL (SIMPLE_STRNCPY, 0) +IMPL (STRNCPY, 1) + +CHAR * +SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n) +{ + CHAR *ret = dst; + while (n--) + if ((*dst++ = *src++) == '\0') + { + while (n--) + *dst++ = '\0'; + return ret; + } + return ret; +} + +CHAR * +STUPID_STRNCPY (CHAR *dst, const CHAR *src, size_t n) +{ + size_t nc = STRNLEN (src, n); + size_t i; + + for (i = 0; i < nc; ++i) + dst[i] = src[i]; + for (; i < n; ++i) + dst[i] = '\0'; + return dst; +} +#endif /* !STRNCPY_RESULT */ + +typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t); + +static void +do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n) +{ + size_t i, iters = INNER_LOOP_ITERS; + timing_t start, stop, cur; + + if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n)) + { + error (0, 0, "Wrong result in function %s %p %p", impl->name, + CALL (impl, dst, src, n), dst); + ret = 1; + return; + } + + if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0) + { + error (0, 0, "Wrong result in function %s", impl->name); + ret = 1; + return; + } + + if (n > len) + { + size_t i; + + for (i = len; i < n; ++i) + if (dst [i] != '\0') + { + error (0, 0, "Wrong result in function %s", impl->name); + ret = 1; + return; + } + } + + TIMING_NOW (start); + for (i = 0; i < iters; ++i) + { + CALL (impl, dst, src, n); + } + TIMING_NOW (stop); + + TIMING_DIFF (cur, start, stop); + + TIMING_PRINT_MEAN ((double) cur, (double) iters); +} + +static void +do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char) +{ + size_t i; + CHAR *s1, *s2; + +/* For wcsncpy: align1 and align2 here mean alignment not in bytes, + but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)). */ + align1 &= 7; + if ((align1 + len) * sizeof (CHAR) >= page_size) + return; + + align2 &= 7; + if ((align2 + len) * sizeof (CHAR) >= page_size) + return; + + s1 = (CHAR *) (buf1) + align1; + s2 = (CHAR *) (buf2) + align2; + + for (i = 0; i < len; ++i) + s1[i] = 32 + 23 * i % (max_char - 32); + s1[len] = 0; + for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64; + ++i) + s1[i] = 32 + 32 * i % (max_char - 32); + + printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s2, s1, len, n); + + putchar ('\n'); +} + +static int +test_main (void) +{ + size_t i; + + test_init (); + + printf ("%28s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (i = 1; i < 8; ++i) + { + do_test (i, i, 16, 16, SMALL_CHAR); + do_test (i, i, 16, 16, BIG_CHAR); + do_test (i, 2 * i, 16, 16, SMALL_CHAR); + do_test (2 * i, i, 16, 16, BIG_CHAR); + do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR); + do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR); + do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR); + do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR); + } + + for (i = 1; i < 8; ++i) + { + do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR); + do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR); + do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR); + do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR); + } + + return ret; +} + +#include <support/test-driver.c> |