From 4bd660be40967cd69072f69ebc2ad32bfcc1f206 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Tue, 23 Feb 2021 06:33:10 -0800 Subject: x86: Add string/memory function tests in RTM region At function exit, AVX optimized string/memory functions have VZEROUPPER which triggers RTM abort. When such functions are called inside a transactionally executing RTM region, RTM abort causes severe performance degradation. Add tests to verify that string/memory functions won't cause RTM abort in RTM region. --- sysdeps/x86/tst-strncmp-rtm.c | 52 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 sysdeps/x86/tst-strncmp-rtm.c (limited to 'sysdeps/x86/tst-strncmp-rtm.c') diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c new file mode 100644 index 0000000000..236ad951b5 --- /dev/null +++ b/sysdeps/x86/tst-strncmp-rtm.c @@ -0,0 +1,52 @@ +/* Test case for strncmp inside a transactionally executing RTM region. + Copyright (C) 2021 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 + . */ + +#include + +#define LOOP 3000 +#define STRING_SIZE 1024 +char string1[STRING_SIZE]; +char string2[STRING_SIZE]; + +__attribute__ ((noinline, noclone)) +static int +prepare (void) +{ + memset (string1, 'a', STRING_SIZE - 1); + memset (string2, 'a', STRING_SIZE - 1); + if (strncmp (string1, string2, STRING_SIZE) == 0) + return EXIT_SUCCESS; + else + return EXIT_FAILURE; +} + +__attribute__ ((noinline, noclone)) +static int +function (void) +{ + if (strncmp (string1, string2, STRING_SIZE) == 0) + return 0; + else + return 1; +} + +static int +do_test (void) +{ + return do_test_1 ("strncmp", LOOP, prepare, function); +} -- cgit 1.4.1