diff options
Diffstat (limited to 'REORG.TODO/sysdeps/powerpc/powerpc32/power4/hp-timing.h')
| -rw-r--r-- | REORG.TODO/sysdeps/powerpc/powerpc32/power4/hp-timing.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/powerpc/powerpc32/power4/hp-timing.h b/REORG.TODO/sysdeps/powerpc/powerpc32/power4/hp-timing.h new file mode 100644 index 0000000000..93cce4625a --- /dev/null +++ b/REORG.TODO/sysdeps/powerpc/powerpc32/power4/hp-timing.h @@ -0,0 +1,54 @@ +/* High precision, low overhead timing functions. powerpc64 version. + Copyright (C) 2005-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. + + 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/>. */ + +#ifndef _HP_TIMING_H +#define _HP_TIMING_H 1 + +/* We always assume having the timestamp register. */ +#define HP_TIMING_AVAIL (1) +#define HP_SMALL_TIMING_AVAIL (1) + +/* We indeed have inlined functions. */ +#define HP_TIMING_INLINE (1) + +/* We use 64bit values for the times. */ +typedef unsigned long long int hp_timing_t; + +/* That's quite simple. Use the `mftb' instruction. Note that the value + might not be 100% accurate since there might be some more instructions + running in this moment. This could be changed by using a barrier like + 'lwsync' right before the `mftb' instruction. But we are not interested + in accurate clock cycles here so we don't do this. */ + +#define HP_TIMING_NOW(Var) \ + do { \ + unsigned int hi, lo, tmp; \ + __asm__ __volatile__ ("1: mfspr %0,269;" \ + " mfspr %1,268;" \ + " mfspr %2,269;" \ + " cmpw %0,%2;" \ + " bne 1b;" \ + : "=&r" (hi), "=&r" (lo), "=&r" (tmp) \ + : : "cr0"); \ + Var = ((hp_timing_t) hi << 32) | lo; \ + } while (0) + +#include <hp-timing-common.h> + +#endif /* hp-timing.h */ |