/* High precision, low overhead timing functions. IA-64 version.
- Copyright (C) 2001 Free Software Foundation, Inc.
+ Copyright (C) 2001-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 2001.
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. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#ifndef _HP_TIMING_H
#define _HP_TIMING_H 1
-#include <string.h>
-#include <sys/param.h>
-#include <stdio-common/_itoa.h>
-#include <ia64intrin.h>
-
-/* The macros defined here use the timestamp counter in IA-64. They
- provide a very accurate way to measure the time with very little
- overhead. The time values themself have no real meaning, only
- differences are interesting.
-
- 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 int hp_timing_t;
-/* Internal variable used to store the overhead of the measurement
- opcodes. */
-extern hp_timing_t __libc_hp_timing_overhead;
-
-/* Set timestamp value to zero. */
-#define HP_TIMING_ZERO(Var) (Var) = (0)
-
-
/* The Itanium/Merced has a bug where the ar.itc register value read
is not correct in some situations. The solution is to read again.
For now we always do this until we know how to recognize a fixed
processor implementation. */
-#define REPEAT_READ(val) __builtin_expect ((int) val == -1, 0)
+#define REPEAT_READ(val) __builtin_expect ((long int) val == -1, 0)
-/* That's quite simple. Use the `rdtsc' 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
- 'cpuid' right before the `rdtsc' instruciton. But we are not interested
- in accurate clock cycles here so we don't do this. */
+/* That's quite simple. Use the `ar.itc' instruction. */
#define HP_TIMING_NOW(Var) \
({ unsigned long int __itc; \
do \
while (REPEAT_READ (__itc)); \
Var = __itc; })
-/* Use two 'ar.itc' instructions in a row to find out how long it takes. */
-#define HP_TIMING_DIFF_INIT() \
- do { \
- int __cnt = 5; \
- __libc_hp_timing_overhead = ~0ul; \
- do \
- { \
- hp_timing_t __t1, __t2; \
- HP_TIMING_NOW (__t1); \
- HP_TIMING_NOW (__t2); \
- if (__t2 - __t1 < __libc_hp_timing_overhead) \
- __libc_hp_timing_overhead = __t2 - __t1; \
- } \
- while (--__cnt > 0); \
- } while (0)
-
-/* It's simple arithmetic for us. */
-#define HP_TIMING_DIFF(Diff, Start, End) (Diff) = ((End) - (Start))
-
-/* We have to jump through hoops to get this correctly implemented. */
-#define HP_TIMING_ACCUM(Sum, Diff) \
- do { \
- hp_timing_t __oldval; \
- hp_timing_t __diff = (Diff) - __libc_hp_timing_overhead; \
- hp_timing_t __newval; \
- do \
- { \
- __oldval = (Sum); \
- __newval = __oldval + __diff; \
- } \
- while (! __sync_bool_compare_and_swap (&Sum, __oldvar, __newval)); \
- } 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_word (Val, __buf + sizeof (__buf), 10, 0); \
- int __len = (Len); \
- char *__dest = (Buf); \
- while (__len-- > 0 && __cp < __buf + sizeof (__buf)) \
- *__dest++ = *__cp++; \
- memcpy (__dest, " clock cycles", MIN (__len, sizeof (" clock cycles"))); \
- } while (0)
+#include <hp-timing-common.h>
#endif /* hp-timing.h */
projects / thirdparty / glibc.git / blobdiff