diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c new file mode 100644 index 0000000000..81cb8aa746 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c @@ -0,0 +1,63 @@ +/* Check __ppc_get_timebase_freq() for architecture changes + Copyright (C) 2012-2017 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 + <http://www.gnu.org/licenses/>. */ + +/* Test if __ppc_get_timebase_freq() works and is different from zero. A read + failure might indicate a Linux Kernel change. + This test also use the frequency to compute the real elapsed time. */ + +#include <inttypes.h> +#include <stdio.h> +#include <stdint.h> + +#include <sys/platform/ppc.h> + +/* Maximum value of the Time Base Register: 2^60 - 1. */ +#define MAX_TB 0xFFFFFFFFFFFFFFF + +static int +do_test (void) +{ + uint64_t t1, t2, f, diff; + + t1 = __ppc_get_timebase (); + printf ("t1 = %"PRIu64"\n", t1); + + f = __ppc_get_timebase_freq (); + printf ("Time Base frequency = %"PRIu64" Hz\n", f); + + if (f == 0) { + printf ("Fail: The time base frequency can't be zero.\n"); + return 1; + } + + t2 = __ppc_get_timebase (); + printf ("t2 = %"PRIu64"\n", t2); + + if (t2 > t1) { + diff = t2 - t1; + } else { + diff = (MAX_TB - t2) + t1; + } + + printf ("Elapsed time = %1.2f usecs\n", (double) diff * 1000000 / f ); + + return 0; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |