/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2021 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/rand/rand.h" #include "libc/str/str.h" #include "libc/testlib/ezbench.h" #include "libc/testlib/fastrandomstring.h" #include "libc/testlib/testlib.h" int unfancy_memcmp(const void *a, const void *b, size_t n) { int c; size_t i; const unsigned char *x, *y; for (x = a, y = b, i = 0; i < n; ++i) { if ((c = x[i] - y[i])) { return c; } } return 0; } TEST(memcmp, test) { EXPECT_EQ(0, memcmp("hi", "hi", 2)); EXPECT_NE(0, memcmp("hi", "HI", 2)); EXPECT_EQ(-1, memcmp("a", "b", 1)); EXPECT_EQ(+1, memcmp("b", "a", 1)); } TEST(memcmp, fuzz) { int i, n; char a[32], b[32]; for (i = 0; i < 1000; ++i) { n = rand() & 31; rngset(a, n, rand64, -1); rngset(b, n, rand64, -1); ASSERT_EQ(unfancy_memcmp(a, b, n), memcmp(a, b, n), "n=%d", n); } } BENCH(memcmp, bench) { extern int funcmp(const void *a, const void *b, size_t n) asm("memcmp"); volatile int v; const char *volatile a; const char *volatile b; b = a = "123456789123456789123456789123456789123456789123456789"; EZBENCH2("memcmp same", donothing, v = funcmp(a, b, 7)); b = gc(strdup(b)); EZBENCH2("memcmp 1", donothing, v = funcmp(a, b, 1)); EZBENCH2("memcmp 2", donothing, v = funcmp(a, b, 2)); EZBENCH2("memcmp 3", donothing, v = funcmp(a, b, 3)); EZBENCH2("memcmp 4", donothing, v = funcmp(a, b, 4)); EZBENCH2("memcmp 5", donothing, v = funcmp(a, b, 5)); EZBENCH2("memcmp 6", donothing, v = funcmp(a, b, 6)); EZBENCH2("memcmp 7", donothing, v = funcmp(a, b, 7)); EZBENCH2("memcmp 8", donothing, v = funcmp(a, b, 8)); EZBENCH2("memcmp 9", donothing, v = funcmp(a, b, 9)); EZBENCH2("memcmp 16", donothing, v = funcmp(a, b, 16)); EZBENCH2("memcmp 32", donothing, v = funcmp(a, b, 32)); }