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- /* High precision, low overhead timing functions. Generic version.
- Copyright (C) 1998-2019 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/>. */
- /* In case a platform supports timers in the hardware the following macros
- and types must be defined:
- - 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. This type must be integral.
- - HP_TIMING_NOW: place timestamp for current time in variable given as
- parameter.
- */
- /* The target supports hp-timing. Share the common infrastructure. */
- #include <string.h>
- #include <sys/param.h>
- #include <_itoa.h>
- /* Compute the difference between START and END, storing into DIFF. */
- #define HP_TIMING_DIFF(Diff, Start, End) ((Diff) = (End) - (Start))
- /* Accumulate ADD into SUM. No attempt is made to be thread-safe. */
- #define HP_TIMING_ACCUM_NT(Sum, Diff) ((Sum) += (Diff))
- /* Write a decimal representation of the timing value into the given string. */
- #define HP_TIMING_PRINT(Dest, Len, Val) \
- do { \
- char __buf[20]; \
- char *__dest = (Dest); \
- size_t __len = (Len); \
- char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0); \
- size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len); \
- memcpy (__dest, __cp, __cp_len); \
- memcpy (__dest + __cp_len, " cycles", \
- MIN (__len - __cp_len, sizeof (" cycles"))); \
- __dest[__len - 1] = '\0'; \
- } while (0)
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