diff options
Diffstat (limited to 'src/vppinfra/clib.h')
| -rw-r--r-- | src/vppinfra/clib.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/vppinfra/clib.h b/src/vppinfra/clib.h index 8aec1f16beb..dac41adb165 100644 --- a/src/vppinfra/clib.h +++ b/src/vppinfra/clib.h @@ -111,6 +111,14 @@ #define PREDICT_FALSE(x) __builtin_expect((x),0) #define PREDICT_TRUE(x) __builtin_expect((x),1) +/* + * Compiler barrier + * prevent compiler to reorder memory access accross this boundary + * prevent compiler to cache values in register (force reload) + * Not to be confused with CPU memory barrier below + */ +#define CLIB_COMPILER_BARRIER() asm volatile ("":::"memory") + /* Full memory barrier (read and write). */ #define CLIB_MEMORY_BARRIER() __sync_synchronize () |