diff options
Diffstat (limited to 'include/exec/memop.h')
| -rw-r--r-- | include/exec/memop.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/exec/memop.h b/include/exec/memop.h index acdb40a9b3..407a47d82c 100644 --- a/include/exec/memop.h +++ b/include/exec/memop.h @@ -91,8 +91,12 @@ typedef enum MemOp { * Depending on alignment, one or both will be single-copy atomic. * This is the atomicity e.g. of Arm FEAT_LSE2 LDP. * MO_ATOM_SUBALIGN: the operation is single-copy atomic by parts - * by the alignment. E.g. if the address is 0 mod 4, then each - * 4-byte subobject is single-copy atomic. + * by the alignment. E.g. if an 8-byte value is accessed at an + * address which is 0 mod 8, then the whole 8-byte access is + * single-copy atomic; otherwise, if it is accessed at 0 mod 4 + * then each 4-byte subobject is single-copy atomic; otherwise + * if it is accessed at 0 mod 2 then the four 2-byte subobjects + * are single-copy atomic. * This is the atomicity e.g. of IBM Power. * MO_ATOM_NONE: the operation has no atomicity requirements. * |