diff options
Diffstat (limited to 'sysdeps/i386/i686/hp-timing.h')
| -rw-r--r-- | sysdeps/i386/i686/hp-timing.h | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/sysdeps/i386/i686/hp-timing.h b/sysdeps/i386/i686/hp-timing.h index f2f24d3202..afb5c7123b 100644 --- a/sysdeps/i386/i686/hp-timing.h +++ b/sysdeps/i386/i686/hp-timing.h @@ -1,5 +1,5 @@ /* High precision, low overhead timing functions. i686 version. - Copyright (C) 1998 Free Software Foundation, Inc. + Copyright (C) 1998, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. @@ -84,10 +84,6 @@ /* We use 64bit values for the times. */ typedef unsigned long 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) @@ -101,17 +97,20 @@ extern hp_timing_t __libc_hp_timing_overhead; /* Use two 'rdtsc' instructions in a row to find out how long it takes. */ #define HP_TIMING_DIFF_INIT() \ do { \ - int __cnt = 5; \ - __libc_hp_timing_overhead = ~0ull; \ - do \ + if (GL(dl_hp_timing_overhead) == 0) \ { \ - 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; \ + int __cnt = 5; \ + GL(dl_hp_timing_overhead) = ~0ull; \ + do \ + { \ + hp_timing_t __t1, __t2; \ + HP_TIMING_NOW (__t1); \ + HP_TIMING_NOW (__t2); \ + if (__t2 - __t1 < GL(dl_hp_timing_overhead)) \ + GL(dl_hp_timing_overhead) = __t2 - __t1; \ + } \ + while (--__cnt > 0); \ } \ - while (--__cnt > 0); \ } while (0) /* It's simple arithmetic for us. */ @@ -122,7 +121,7 @@ extern hp_timing_t __libc_hp_timing_overhead; do { \ char __not_done; \ hp_timing_t __oldval = (Sum); \ - hp_timing_t __diff = (Diff) - __libc_hp_timing_overhead; \ + hp_timing_t __diff = (Diff) - GL(dl_hp_timing_overhead); \ do \ { \ hp_timing_t __newval = __oldval + __diff; \ |