diff options
Diffstat (limited to 'src/include/pg_config_manual.h')
| -rw-r--r-- | src/include/pg_config_manual.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h index ac434fabbc4..810be27e813 100644 --- a/src/include/pg_config_manual.h +++ b/src/include/pg_config_manual.h @@ -6,6 +6,9 @@ * for developers. If you edit any of these, be sure to do a *full* * rebuild (and an initdb if noted). * + * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * * src/include/pg_config_manual.h *------------------------------------------------------------------------ */ @@ -171,6 +174,21 @@ #endif /* + * On PPC machines, decide whether to use the mutex hint bit in LWARX + * instructions. Setting the hint bit will slightly improve spinlock + * performance on POWER6 and later machines, but does nothing before that, + * and will result in illegal-instruction failures on some pre-POWER4 + * machines. By default we use the hint bit when building for 64-bit PPC, + * which should be safe in nearly all cases. You might want to override + * this if you are building 32-bit code for a known-recent PPC machine. + */ +#ifdef HAVE_PPC_LWARX_MUTEX_HINT /* must have assembler support in any case */ +#if defined(__ppc64__) || defined(__powerpc64__) +#define USE_PPC_LWARX_MUTEX_HINT +#endif +#endif + +/* *------------------------------------------------------------------------ * The following symbols are for enabling debugging code, not for * controlling user-visible features or resource limits. |