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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/powerpc/powerpc32/power4/hp-timing.h
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1 /* High precision, low overhead timing functions. powerpc64 version.
2 Copyright (C) 2005-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
21 #define _HP_TIMING_H 1
23 /* We indeed have inlined functions. */
24 #define HP_TIMING_INLINE (1)
26 /* We use 64bit values for the times. */
27 typedef unsigned long long int hp_timing_t
;
29 /* That's quite simple. Use the `mftb' instruction. Note that the value
30 might not be 100% accurate since there might be some more instructions
31 running in this moment. This could be changed by using a barrier like
32 'lwsync' right before the `mftb' instruction. But we are not interested
33 in accurate clock cycles here so we don't do this. */
35 #define HP_TIMING_NOW(Var) \
37 unsigned int hi, lo, tmp; \
38 __asm__ __volatile__ ("1: mfspr %0,269;" \
43 : "=&r" (hi), "=&r" (lo), "=&r" (tmp) \
45 Var = ((hp_timing_t) hi << 32) | lo; \
48 #include <hp-timing-common.h>
50 #endif /* hp-timing.h */