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Diffstat (limited to 'sysdeps/ia64/hp-timing.h')
| -rw-r--r-- | sysdeps/ia64/hp-timing.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/sysdeps/ia64/hp-timing.h b/sysdeps/ia64/hp-timing.h new file mode 100644 index 0000000000..df5bc16665 --- /dev/null +++ b/sysdeps/ia64/hp-timing.h @@ -0,0 +1,155 @@ +/* High precision, low overhead timing functions. IA-64 version. + Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _HP_TIMING_H +#define _HP_TIMING_H 1 + +#include <string.h> +#include <sys/param.h> +#include <stdio-common/_itoa.h> +#include <ia64intrin.h> + +/* The macros defined here use the timestamp counter in IA-64. They + provide a very accurate way to measure the time with very little + overhead. The time values themself have no real meaning, only + differences are interesting. + + The list of macros we need includes the following: + + - 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_ZERO: clear `hp_timing_t' object. + + - HP_TIMING_NOW: place timestamp for current time in variable given as + parameter. + + - HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the + HP_TIMING_DIFF macro. + + - HP_TIMING_DIFF: compute difference between two times and store it + in a third. Source and destination might overlap. + + - HP_TIMING_ACCUM: add time difference to another variable. This might + be a bit more complicated to implement for some platforms as the + operation should be thread-safe and 64bit arithmetic on 32bit platforms + is not. + + - HP_TIMING_ACCUM_NT: this is the variant for situations where we know + there are no threads involved. + + - 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. + +*/ + +/* We always assume having the timestamp register. */ +#define HP_TIMING_AVAIL (1) + +/* We indeed have inlined functions. */ +#define HP_TIMING_INLINE (1) + +/* We use 64bit values for the times. */ +typedef unsigned long int hp_timing_t; + +/* Internal variable used to store the overhead of the measurement + opcodes. */ +extern hp_timing_t __libc_hp_timing_overhead; + +/* Set timestamp value to zero. */ +#define HP_TIMING_ZERO(Var) (Var) = (0) + + +/* The Itanium/Merced has a bug where the ar.itc register value read + is not correct in some situations. The solution is to read again. + For now we always do this until we know how to recognize a fixed + processor implementation. */ +#define REPEAT_READ(val) __builtin_expect ((int) val == -1, 0) + +/* That's quite simple. Use the `rdtsc' instruction. Note that the value + might not be 100% accurate since there might be some more instructions + running in this moment. This could be changed by using a barrier like + 'cpuid' right before the `rdtsc' instruciton. But we are not interested + in accurate clock cycles here so we don't do this. */ +#define HP_TIMING_NOW(Var) \ + ({ unsigned long int __itc; \ + do \ + asm volatile ("mov %0=ar.itc" : "=r" (__itc) : : "memory"); \ + while (REPEAT_READ (__itc)); \ + Var = __itc; }) + +/* Use two 'ar.itc' instructions in a row to find out how long it takes. */ +#define HP_TIMING_DIFF_INIT() \ + do { \ + int __cnt = 5; \ + __libc_hp_timing_overhead = ~0ul; \ + do \ + { \ + hp_timing_t __t1, __t2; \ + HP_TIMING_NOW (__t1); \ + HP_TIMING_NOW (__t2); \ + if (__t2 - __t1 < __libc_hp_timing_overhead) \ + __libc_hp_timing_overhead = __t2 - __t1; \ + } \ + while (--__cnt > 0); \ + } while (0) + +/* It's simple arithmetic for us. */ +#define HP_TIMING_DIFF(Diff, Start, End) (Diff) = ((End) - (Start)) + +/* We have to jump through hoops to get this correctly implemented. */ +#define HP_TIMING_ACCUM(Sum, Diff) \ + do { \ + hp_timing_t __oldval; \ + hp_timing_t __diff = (Diff) - __libc_hp_timing_overhead; \ + hp_timing_t __newval; \ + do \ + { \ + __oldval = (Sum); \ + __newval = __oldval + __diff; \ + } \ + while (! __sync_bool_compare_and_swap (&Sum, __oldvar, __newval)); \ + } while (0) + +/* No threads, no extra work. */ +#define HP_TIMING_ACCUM_NT(Sum, Diff) (Sum) += (Diff) + +/* Print the time value. */ +#define HP_TIMING_PRINT(Buf, Len, Val) \ + do { \ + char __buf[20]; \ + char *__cp = _itoa_word (Val, __buf + sizeof (__buf), 10, 0); \ + int __len = (Len); \ + char *__dest = (Buf); \ + while (__len-- > 0 && __cp < __buf + sizeof (__buf)) \ + *__dest++ = *__cp++; \ + memcpy (__dest, " clock cycles", MIN (__len, sizeof (" clock cycles"))); \ + } while (0) + +#endif /* hp-timing.h */ |