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63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
/* High precision, low overhead timing functions. Generic version.
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Copyright (C) 1998-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* In case a platform supports timers in the hardware the following macros
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and types must be defined:
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- HP_TIMING_AVAIL: test for availability.
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- HP_TIMING_INLINE: this macro is non-zero if the functionality is not
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implemented using function calls but instead uses some inlined code
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which might simply consist of a few assembler instructions. We have to
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know this since we might want to use the macros here in places where we
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cannot make function calls.
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- hp_timing_t: This is the type for variables used to store the time
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values. This type must be integral.
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- HP_TIMING_NOW: place timestamp for current time in variable given as
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parameter.
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*/
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/* The target supports hp-timing. Share the common infrastructure. */
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#include <string.h>
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#include <sys/param.h>
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#include <_itoa.h>
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/* Compute the difference between START and END, storing into DIFF. */
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#define HP_TIMING_DIFF(Diff, Start, End) ((Diff) = (End) - (Start))
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/* Accumulate ADD into SUM. No attempt is made to be thread-safe. */
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#define HP_TIMING_ACCUM_NT(Sum, Diff) ((Sum) += (Diff))
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/* Write a decimal representation of the timing value into the given string. */
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#define HP_TIMING_PRINT(Dest, Len, Val) \
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do { \
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char __buf[20]; \
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char *__dest = (Dest); \
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size_t __len = (Len); \
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char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0); \
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size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len); \
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memcpy (__dest, __cp, __cp_len); \
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memcpy (__dest + __cp_len, " cycles", \
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MIN (__len - __cp_len, sizeof (" cycles"))); \
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__dest[__len - 1] = '\0'; \
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} while (0)
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