diff options
Diffstat (limited to 'sysdeps/generic')
| -rw-r--r-- | sysdeps/generic/hp-timing-common.h | 62 | ||||
| -rw-r--r-- | sysdeps/generic/hp-timing.h | 32 |
2 files changed, 63 insertions, 31 deletions
diff --git a/sysdeps/generic/hp-timing-common.h b/sysdeps/generic/hp-timing-common.h new file mode 100644 index 0000000000..1d7e95ee80 --- /dev/null +++ b/sysdeps/generic/hp-timing-common.h @@ -0,0 +1,62 @@ +/* High precision, low overhead timing functions. Generic version. + Copyright (C) 1998-2014 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) diff --git a/sysdeps/generic/hp-timing.h b/sysdeps/generic/hp-timing.h index 49ddb91046..95c051dd57 100644 --- a/sysdeps/generic/hp-timing.h +++ b/sysdeps/generic/hp-timing.h @@ -20,39 +20,9 @@ #ifndef _HP_TIMING_H #define _HP_TIMING_H 1 - /* There are no generic definitions for the times. We could write something using the `gettimeofday' system call where available but the overhead of - the system call might be too high. - - 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. - - - HP_TIMING_NOW: place timestamp for current time in variable given as - parameter. - - - HP_TIMING_DIFF: compute difference between two times and store it - in a third. Source and destination might overlap. - - - HP_TIMING_ACCUM_NT: add time difference to another variable, without - being thread-safe. - - - 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. - -*/ + the system call might be too high. */ /* Provide dummy definitions. */ #define HP_TIMING_AVAIL (0) |