sysdeps/sparc/sparc64/hp-timing.h

   1 /* High precision, low overhead timing functions.  sparc64 version.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by David S. Miller <davem@redhat.com>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _HP_TIMING_H
  21 #define _HP_TIMING_H    1
  22
  23 #include <string.h>
  24 #include <sys/param.h>
  25 #include <_itoa.h>
  26
  27 #define HP_TIMING_AVAIL         (1)
  28 #define HP_TIMING_INLINE        (1)
  29
  30 typedef unsigned long int hp_timing_t;
  31
  32 #define HP_TIMING_ZERO(Var)     (Var) = (0)
  33
  34 #define HP_TIMING_NOW(Var) __asm__ __volatile__ ("rd %%tick, %0" : "=r" (Var))
  35
  36 #define HP_TIMING_DIFF_INIT() \
  37   do {                                                                        \
  38     int __cnt = 5;                                                            \
  39     GLRO(dl_hp_timing_overhead) = ~0ull;                                      \
  40     do                                                                        \
  41       {                                                                       \
  42         hp_timing_t __t1, __t2;                                               \
  43         HP_TIMING_NOW (__t1);                                                 \
  44         HP_TIMING_NOW (__t2);                                                 \
  45         if (__t2 - __t1 < GLRO(dl_hp_timing_overhead))                        \
  46           GLRO(dl_hp_timing_overhead) = __t2 - __t1;                          \
  47       }                                                                       \
  48     while (--__cnt > 0);                                                      \
  49   } while (0)
  50
  51 #define HP_TIMING_DIFF(Diff, Start, End)        (Diff) = ((End) - (Start))
  52
  53 #define HP_TIMING_ACCUM(Sum, Diff)                              \
  54 do {                                                            \
  55   hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead);    \
  56   hp_timing_t tmp1, tmp2;                                       \
  57   __asm__ __volatile__("1: ldx  [%3], %0\n\t"                   \
  58                        "add     %0, %2, %1\n\t"                 \
  59                        "casx    [%3], %0,  %1\n\t"              \
  60                        "cmp     %0, %1\n\t"                     \
  61                        "bne,pn  %%xcc, 1b\n\t"                  \
  62                        " nop"                                   \
  63                        : "=&r" (tmp1), "=&r" (tmp2)             \
  64                        : "r" (__diff), "r" (&(Sum))             \
  65                        : "memory", "g1", "g5", "g6");           \
  66 } while(0)
  67
  68 #define HP_TIMING_ACCUM_NT(Sum, Diff)   (Sum) += (Diff)
  69
  70 #define HP_TIMING_PRINT(Buf, Len, Val) \
  71   do {                                                                        \
  72     char __buf[20];                                                           \
  73     char *__cp = _itoa (Val, __buf + sizeof (__buf), 10, 0);                  \
  74     int __len = (Len);                                                        \
  75     char *__dest = (Buf);                                                     \
  76     while (__len-- > 0 && __cp < __buf + sizeof (__buf))                      \
  77       *__dest++ = *__cp++;                                                    \
  78     memcpy (__dest, " clock cycles", MIN (__len, sizeof (" clock cycles")));  \
  79   } while (0)
  80
  81 #endif  /* hp-timing.h */