diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/hp-timing.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/hp-timing.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sysdeps/powerpc/powerpc64/hp-timing.h b/sysdeps/powerpc/powerpc64/hp-timing.h index b58cca9003..e107a2dd49 100644 --- a/sysdeps/powerpc/powerpc64/hp-timing.h +++ b/sysdeps/powerpc/powerpc64/hp-timing.h @@ -1,5 +1,5 @@ /* High precision, low overhead timing functions. powerpc64 version. - Copyright (C) 2005 Free Software Foundation, Inc. + Copyright (C) 2005, 2008 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. @@ -85,7 +85,11 @@ typedef unsigned long long int hp_timing_t; running in this moment. This could be changed by using a barrier like 'lwsync' right before the `mftb' instruciton. But we are not interested in accurate clock cycles here so we don't do this. */ +#ifdef _ARCH_PWR4 +#define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mfspr %0,268" : "=r" (Var)) +#else #define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mftb %0" : "=r" (Var)) +#endif /* Use two 'mftb' instructions in a row to find out how long it takes. On current POWER4, POWER5, and 970 processors mftb take ~10 cycles. */ |