1 /* High precision, low overhead timing functions. Generic version. 2 Copyright (C) 1998-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 /* In case a platform supports timers in the hardware the following macros 20 and types must be defined: 21 22 - HP_TIMING_INLINE: this macro is non-zero if the functionality is not 23 implemented using function calls but instead uses some inlined code 24 which might simply consist of a few assembler instructions. We have to 25 know this since we might want to use the macros here in places where we 26 cannot make function calls. 27 28 - hp_timing_t: This is the type for variables used to store the time 29 values. This type must be integral. 30 31 - HP_TIMING_NOW: place timestamp for current time in variable given as 32 parameter. 33 */ 34 35 /* The target supports hp-timing. Share the common infrastructure. */ 36 37 #include <string.h> 38 #include <sys/param.h> 39 #include <_itoa.h> 40 41 /* Compute the difference between START and END, storing into DIFF. */ 42 #define HP_TIMING_DIFF(Diff, Start, End) ((Diff) = (End) - (Start)) 43 44 /* Accumulate ADD into SUM. No attempt is made to be thread-safe. */ 45 #define HP_TIMING_ACCUM_NT(Sum, Diff) ((Sum) += (Diff)) 46 47 #define HP_TIMING_PRINT_SIZE (3 * sizeof (hp_timing_t) + 1) 48 49 /* Write a decimal representation of the timing value into the given string. */ 50 #define HP_TIMING_PRINT(Dest, Len, Val) \ 51 do { \ 52 char __buf[HP_TIMING_PRINT_SIZE]; \ 53 char *__dest = (Dest); \ 54 size_t __len = (Len); \ 55 char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0); \ 56 size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len); \ 57 memcpy (__dest, __cp, __cp_len); \ 58 __dest[__cp_len - 1] = '\0'; \ 59 } while (0) 60