diff options
Diffstat (limited to 'sysdeps/mips/atomic-machine.h')
| -rw-r--r-- | sysdeps/mips/atomic-machine.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sysdeps/mips/atomic-machine.h b/sysdeps/mips/atomic-machine.h index 54c182b38b..16fef6b797 100644 --- a/sysdeps/mips/atomic-machine.h +++ b/sysdeps/mips/atomic-machine.h @@ -92,7 +92,15 @@ typedef uintmax_t uatomic_max_t; have no assembly alternative available and want to avoid the __sync_* builtins if at all possible. */ -#define USE_ATOMIC_COMPILER_BUILTINS 1 +# define USE_ATOMIC_COMPILER_BUILTINS 1 + +/* MIPS is an LL/SC machine. However, XLP has a direct atomic exchange + instruction which will be used by __atomic_exchange_n. */ +# ifdef _MIPS_ARCH_XLP +# define ATOMIC_EXCHANGE_USES_CAS 0 +# else +# define ATOMIC_EXCHANGE_USES_CAS 1 +# endif /* Compare and exchange. For all "bool" routines, we return FALSE if exchange succesful. */ @@ -213,7 +221,8 @@ typedef uintmax_t uatomic_max_t; /* This implementation using inline assembly will be removed once glibc requires GCC 4.8 or later to build. */ -#define USE_ATOMIC_COMPILER_BUILTINS 0 +# define USE_ATOMIC_COMPILER_BUILTINS 0 +# define ATOMIC_EXCHANGE_USES_CAS 1 /* Compare and exchange. For all of the "xxx" routines, we expect a "__prev" and a "__cmp" variable to be provided by the enclosing scope, |