diff options
| -rw-r--r-- | ChangeLog | 10 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power4/hp-timing.c | 25 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power4/hp-timing.h | 152 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/hp-timing.h | 6 |
4 files changed, 191 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index 48f90f47f2..a45eec9a0b 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2008-04-03 Steven Munroe <sjmunroe@us.ibm.com> + + * sysdeps/powerpc/powerpc32/power4/hp-timing.c: New file. + * sysdeps/powerpc/powerpc32/power4/hp-timing.h: New file. + * sysdeps/powerpc/powerpc64/hp-timing.h [_ARCH_PWR4] (HP_TIMING_NOW): + For ISA 2.01 and later replace mftb with mfspr 268. + 2008-02-19 Steven Munroe <sjmunroe@us.ibm.com> [BZ #5768] @@ -51,7 +58,8 @@ 2008-04-09 Ulrich Drepper <drepper@redhat.com> [BZ #4314] - * sysdeps/i386/i686/memcpy.S: Optimize copying of aligned buffers. + * sysdeps/i386/i686/memcpy.S: Optimize copying of equally aligned + buffers. [BZ #5209] * sysdeps/unix/sysv/syscalls.list: The times syscall doesn't return diff --git a/sysdeps/powerpc/powerpc32/power4/hp-timing.c b/sysdeps/powerpc/powerpc32/power4/hp-timing.c new file mode 100644 index 0000000000..332fe8af99 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/power4/hp-timing.c @@ -0,0 +1,25 @@ +/* Support for high precision, low overhead timing functions. + powerpc64 version. + 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. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <hp-timing.h> + +/* We have to define the variable for the overhead. */ +hp_timing_t _dl_hp_timing_overhead; diff --git a/sysdeps/powerpc/powerpc32/power4/hp-timing.h b/sysdeps/powerpc/powerpc32/power4/hp-timing.h new file mode 100644 index 0000000000..5f719dd5a1 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/power4/hp-timing.h @@ -0,0 +1,152 @@ +/* High precision, low overhead timing functions. powerpc64 version. + 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. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; 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 <atomic.h> + +/* The macros defined here use the powerpc 64-bit time base register. + The time base is nominally clocked at 1/8th the CPU clock, but this + can vary. + + 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 long int hp_timing_t; + +/* Set timestamp value to zero. */ +#define HP_TIMING_ZERO(Var) (Var) = (0) + +/* That's quite simple. Use the `mftb' 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 + 'lwsync' right before the `mftb' instruciton. But we are not interested + in accurate clock cycles here so we don't do this. */ + +#define HP_TIMING_NOW(Var) \ + do { \ + union { long long ll; long ii[2]; } _var; \ + long tmp; \ + __asm__ __volatile__ ( \ + "1: mfspr %0,269;" \ + " mfspr %1,268;" \ + " mfspr %2,269;" \ + " cmpw %0,%2;" \ + " bne 1b;" \ + : "=r" (_var.ii[0]), "=r" (_var.ii[1]) , "=r" (tmp) \ + : : "cr0" \ + ); \ + Var = _var.ll; \ + } while (0) + + +/* 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. */ +#define HP_TIMING_DIFF_INIT() \ + do { \ + if (GLRO(dl_hp_timing_overhead) == 0) \ + { \ + int __cnt = 5; \ + GLRO(dl_hp_timing_overhead) = ~0ull; \ + do \ + { \ + hp_timing_t __t1, __t2; \ + HP_TIMING_NOW (__t1); \ + HP_TIMING_NOW (__t2); \ + if (__t2 - __t1 < GLRO(dl_hp_timing_overhead)) \ + GLRO(dl_hp_timing_overhead) = __t2 - __t1; \ + } \ + while (--__cnt > 0); \ + } \ + } while (0) + +/* It's simple arithmetic in 64-bit. */ +#define HP_TIMING_DIFF(Diff, Start, End) (Diff) = ((End) - (Start)) + +/* We need to insure that this add is atomic in threaded environments. We use + __arch_atomic_exchange_and_add_64 from atomic.h to get thread safety. */ +#define HP_TIMING_ACCUM(Sum, Diff) \ + do { \ + hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead); \ + __arch_atomic_exchange_and_add_64 (&(Sum), __diff); \ + } 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 (Val, __buf + sizeof (__buf), 10, 0); \ + size_t __len = (Len); \ + char *__dest = (Buf); \ + while (__len-- > 0 && __cp < __buf + sizeof (__buf)) \ + *__dest++ = *__cp++; \ + memcpy (__dest, " ticks", MIN (__len, sizeof (" ticks"))); \ + } while (0) + +#endif /* hp-timing.h */ 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. */ |