From d9dc34cd569bcfe714fe8c708e58c028106e8b2e Mon Sep 17 00:00:00 2001 From: Tulio Magno Quites Machado Filho Date: Mon, 4 Jun 2012 13:46:37 -0500 Subject: Manual for platform-specific features and new __ppc_get_timebase inline. [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. --- sysdeps/powerpc/test-gettimebase.c | 46 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 sysdeps/powerpc/test-gettimebase.c (limited to 'sysdeps/powerpc/test-gettimebase.c') diff --git a/sysdeps/powerpc/test-gettimebase.c b/sysdeps/powerpc/test-gettimebase.c new file mode 100644 index 0000000000..0e828ff868 --- /dev/null +++ b/sysdeps/powerpc/test-gettimebase.c @@ -0,0 +1,46 @@ +/* Check __ppc_get_timebase() for architecture changes + Copyright (C) 2012 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 + . */ + +/* Test if __ppc_get_timebase() is compatible with the current processor and if + it's changing between reads. A read failure might indicate a Power ISA or + binutils change. */ + +#include +#include + +#include + +static int +do_test (void) +{ + uint64_t t1, t2, t3; + t1 = __ppc_get_timebase (); + printf ("Time Base = %"PRIu64"\n", t1); + t2 = __ppc_get_timebase (); + printf ("Time Base = %"PRIu64"\n", t2); + t3 = __ppc_get_timebase (); + printf ("Time Base = %"PRIu64"\n", t3); + if (t1 != t2 && t1 != t3 && t2 != t3) + return 0; + + printf ("Fail: timebase reads should always be different."); + return 1; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" -- cgit v1.2.3