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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /sysdeps/powerpc/powerpc64/hp-timing.h
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
downloadglibc-a334319f6530564d22e775935d9c91663623a1b4.tar.gz
(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/hp-timing.h')
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diff --git a/sysdeps/powerpc/powerpc64/hp-timing.h b/sysdeps/powerpc/powerpc64/hp-timing.h
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-/* High precision, low overhead timing functions. powerpc64 version.
- Copyright (C) 2005 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#ifndef _HP_TIMING_H
-#define _HP_TIMING_H 1
-
-#include <string.h>
-#include <sys/param.h>
-#include <stdio-common/_itoa.h>
-#include <atomic.h>
-
-/* The macros defined here use the powerpc 64-bit time base register.
- The time base is nominally clocked at 1/8th the CPU clock, but this
- can vary.
-
- The list of macros we need includes the following:
-
- - HP_TIMING_AVAIL: test for availability.
-
- - HP_TIMING_INLINE: this macro is non-zero if the functionality is not
- implemented using function calls but instead uses some inlined code
- which might simply consist of a few assembler instructions. We have to
- know this since we might want to use the macros here in places where we
- cannot make function calls.
-
- - hp_timing_t: This is the type for variables used to store the time
- values.
-
- - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
- - HP_TIMING_NOW: place timestamp for current time in variable given as
- parameter.
-
- - HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the
- HP_TIMING_DIFF macro.
-
- - HP_TIMING_DIFF: compute difference between two times and store it
- in a third. Source and destination might overlap.
-
- - HP_TIMING_ACCUM: add time difference to another variable. This might
- be a bit more complicated to implement for some platforms as the
- operation should be thread-safe and 64bit arithmetic on 32bit platforms
- is not.
-
- - HP_TIMING_ACCUM_NT: this is the variant for situations where we know
- there are no threads involved.
-
- - HP_TIMING_PRINT: write decimal representation of the timing value into
- the given string. This operation need not be inline even though
- HP_TIMING_INLINE is specified.
-
-*/
-
-/* We always assume having the timestamp register. */
-#define HP_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;
-
-/* Set timestamp value to zero. */
-#define HP_TIMING_ZERO(Var) (Var) = (0)
-
-/* 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' instruciton. But we are not interested
- in accurate clock cycles here so we don't do this. */
-#define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mftb %0" : "=r" (Var))
-
-/* Use two 'mftb' instructions in a row to find out how long it takes.
- On current POWER4, POWER5, and 970 processors mftb take ~10 cycles. */
-#define HP_TIMING_DIFF_INIT() \
- do { \
- if (GLRO(dl_hp_timing_overhead) == 0) \
- { \
- int __cnt = 5; \
- GLRO(dl_hp_timing_overhead) = ~0ull; \
- do \
- { \
- hp_timing_t __t1, __t2; \
- HP_TIMING_NOW (__t1); \
- HP_TIMING_NOW (__t2); \
- if (__t2 - __t1 < GLRO(dl_hp_timing_overhead)) \
- GLRO(dl_hp_timing_overhead) = __t2 - __t1; \
- } \
- while (--__cnt > 0); \
- } \
- } while (0)
-
-/* It's simple arithmetic in 64-bit. */
-#define HP_TIMING_DIFF(Diff, Start, End) (Diff) = ((End) - (Start))
-
-/* We need to insure that this add is atomic in threaded environments. We use
- __arch_atomic_exchange_and_add_64 from atomic.h to get thread safety. */
-#define HP_TIMING_ACCUM(Sum, Diff) \
- do { \
- hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead); \
- __arch_atomic_exchange_and_add_64 (&(Sum), __diff); \
- } while (0)
-
-/* No threads, no extra work. */
-#define HP_TIMING_ACCUM_NT(Sum, Diff) (Sum) += (Diff)
-
-/* Print the time value. */
-#define HP_TIMING_PRINT(Buf, Len, Val) \
- do { \
- char __buf[20]; \
- char *__cp = _itoa (Val, __buf + sizeof (__buf), 10, 0); \
- size_t __len = (Len); \
- char *__dest = (Buf); \
- while (__len-- > 0 && __cp < __buf + sizeof (__buf)) \
- *__dest++ = *__cp++; \
- memcpy (__dest, " ticks", MIN (__len, sizeof (" ticks"))); \
- } while (0)
-
-#endif /* hp-timing.h */