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20d37de533
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.
(cherry picked from commit 4bd660be40)
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* Test string function in a transactionally executing RTM region.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <x86intrin.h>
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#include <cpu-features.h>
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#include <support/check.h>
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#include <support/test-driver.h>
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static int
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do_test_1 (const char *name, unsigned int loop, int (*prepare) (void),
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int (*function) (void))
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{
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if (!CPU_FEATURE_USABLE (RTM))
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return EXIT_UNSUPPORTED;
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int status = prepare ();
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if (status != EXIT_SUCCESS)
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return status;
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unsigned int i;
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unsigned int naborts = 0;
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unsigned int failed = 0;
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for (i = 0; i < loop; i++)
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{
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failed |= function ();
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if (_xbegin() == _XBEGIN_STARTED)
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{
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failed |= function ();
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_xend();
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}
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else
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{
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failed |= function ();
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++naborts;
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}
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}
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if (failed)
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FAIL_EXIT1 ("%s() failed", name);
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if (naborts)
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{
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/* NB: Low single digit (<= 5%) noise-level aborts are normal for
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TSX. */
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double rate = 100 * ((double) naborts) / ((double) loop);
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if (rate > 5)
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FAIL_EXIT1 ("TSX abort rate: %.2f%% (%d out of %d)",
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rate, naborts, loop);
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}
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return EXIT_SUCCESS;
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}
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static int do_test (void);
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#include <support/test-driver.c>
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