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[BZ #13743] A new class of installed headers has been documented for low-level platform-specific functionality. PowerPC added the first instance with a function to provide time base register access (__ppc_get_timebase). This is required for applications that measure time at high frequencies with high precision that can't afford a syscall.
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* Check __ppc_get_timebase() for architecture changes
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Copyright (C) 2012 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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<http://www.gnu.org/licenses/>. */
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/* Test if __ppc_get_timebase() is compatible with the current processor and if
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it's changing between reads. A read failure might indicate a Power ISA or
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binutils change. */
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#include <inttypes.h>
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#include <stdio.h>
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#include <sys/platform/ppc.h>
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static int
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do_test (void)
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{
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uint64_t t1, t2, t3;
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t1 = __ppc_get_timebase ();
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printf ("Time Base = %"PRIu64"\n", t1);
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t2 = __ppc_get_timebase ();
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printf ("Time Base = %"PRIu64"\n", t2);
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t3 = __ppc_get_timebase ();
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printf ("Time Base = %"PRIu64"\n", t3);
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if (t1 != t2 && t1 != t3 && t2 != t3)
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return 0;
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printf ("Fail: timebase reads should always be different.");
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return 1;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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