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Diffstat (limited to 'string/test-memcmp.c')
| -rw-r--r-- | string/test-memcmp.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/string/test-memcmp.c b/string/test-memcmp.c new file mode 100644 index 0000000000..d3cc560470 --- /dev/null +++ b/string/test-memcmp.c @@ -0,0 +1,222 @@ +/* Test and measure memcmp functions. + Copyright (C) 1999, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Written by Jakub Jelinek <jakub@redhat.com>, 1999. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define TEST_MAIN +#include "test-string.h" + +typedef int (*proto_t) (const char *, const char *, size_t); +int simple_memcmp (const char *, const char *, size_t); + +IMPL (simple_memcmp, 0) +IMPL (memcmp, 1) + +int +simple_memcmp (const char *s1, const char *s2, size_t n) +{ + int ret = 0; + + while (n-- + && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0); + return ret; +} + +static void +do_one_test (impl_t *impl, const char *s1, const char *s2, size_t len, + int exp_result) +{ + int result = CALL (impl, s1, s2, len); + if ((exp_result == 0 && result != 0) + || (exp_result < 0 && result >= 0) + || (exp_result > 0 && result <= 0)) + { + error (0, 0, "Wrong result in function %s %d %d", impl->name, + result, exp_result); + ret = 1; + return; + } + + if (HP_TIMING_AVAIL) + { + hp_timing_t start, stop, best_time = ~ (hp_timing_t) 0; + size_t i; + + for (i = 0; i < 32; ++i) + { + HP_TIMING_NOW (start); + CALL (impl, s1, s2, len); + HP_TIMING_NOW (stop); + HP_TIMING_BEST (best_time, start, stop); + } + + printf ("\t%zd", (size_t) best_time); + } +} + +static void +do_test (size_t align1, size_t align2, size_t len, int exp_result) +{ + size_t i; + char *s1, *s2; + + if (len == 0) + return; + + align1 &= 7; + if (align1 + len >= page_size) + return; + + align2 &= 7; + if (align2 + len >= page_size) + return; + + s1 = buf1 + align1; + s2 = buf2 + align2; + + for (i = 0; i < len; i++) + s1[i] = s2[i] = 1 + 23 * i % 255; + + s1[len] = align1; + s2[len] = align2; + s2[len - 1] -= exp_result; + + if (HP_TIMING_AVAIL) + printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s1, s2, len, exp_result); + + if (HP_TIMING_AVAIL) + putchar ('\n'); +} + +static void +do_random_tests (void) +{ + size_t i, j, n, align1, align2, pos, len; + int result, r; + unsigned char *p1 = buf1 + page_size - 512; + unsigned char *p2 = buf2 + page_size - 512; + + for (n = 0; n < ITERATIONS; n++) + { + align1 = random () & 31; + if (random () & 1) + align2 = random () & 31; + else + align2 = align1 + (random () & 24); + pos = random () & 511; + j = align1; + if (align2 > j) + j = align2; + if (pos + j >= 512) + pos = 511 - j - (random () & 7); + len = random () & 511; + if (len + j >= 512) + len = 511 - j - (random () & 7); + j = len + align1 + 64; + if (j > 512) j = 512; + for (i = 0; i < j; ++i) + p1[i] = random () & 255; + for (i = 0; i < j; ++i) + p2[i] = random () & 255; + + result = 0; + if (pos >= len) + memcpy (p2 + align2, p1 + align1, len); + else + { + memcpy (p2 + align2, p1 + align1, pos); + if (p2[align2 + pos] == p1[align1 + pos]) + { + p2[align2 + pos] = random () & 255; + if (p2[align2 + pos] == p1[align1 + pos]) + p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127); + } + + if (p1[align1 + pos] < p2[align2 + pos]) + result = -1; + else + result = 1; + } + + FOR_EACH_IMPL (impl, 1) + { + r = CALL (impl, p1 + align1, p2 + align2, len); + if ((r == 0 && result) + || (r < 0 && result >= 0) + || (r > 0 && result <= 0)) + { + error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd) %d != %d, p1 %p p2 %p", + n, impl->name, align1, align2, len, pos, r, result, p1, p2); + ret = 1; + } + } + } +} + +int +test_main (void) +{ + size_t i; + + test_init (); + + printf ("%23s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (i = 1; i < 16; ++i) + { + do_test (i, i, i, 0); + do_test (i, i, i, 1); + do_test (i, i, i, -1); + } + + for (i = 0; i < 16; ++i) + { + do_test (0, 0, i, 0); + do_test (0, 0, i, 1); + do_test (0, 0, i, -1); + } + + for (i = 1; i < 10; ++i) + { + do_test (0, 0, 2 << i, 0); + do_test (0, 0, 2 << i, 1); + do_test (0, 0, 2 << i, -1); + do_test (0, 0, 16 << i, 0); + do_test (8 - i, 2 * i, 16 << i, 0); + do_test (0, 0, 16 << i, 1); + do_test (0, 0, 16 << i, -1); + } + + for (i = 1; i < 8; ++i) + { + do_test (i, 2 * i, 8 << i, 0); + do_test (i, 2 * i, 8 << i, 1); + do_test (i, 2 * i, 8 << i, -1); + } + + do_random_tests (); + return ret; +} + +#include "../test-skeleton.c" |