We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
Hi,
Store Buffer holds store operation before it is commited to Cache or Main Memory.
So only if the proper store buffer entry is drained, can we get the right data by a load operation. Am I right?
If yes, is it possible that we read a unexpected value after a write without a drain request(e.g. DMB)?
Thanks&Regards.
OK. Thanks very much.
So you mean that on a single cpu, whether store buffer is presence or absence and whether read from stroe buffer or waiting for store buffer drained during a load operation are both implemention defined. Is my understanding right?
That is correct, on both single- and multi- processors.
The single cpu reference was to highlight, through an example, that a cpu won't return wrong data as you feared (in the particular case of a cpu reading its own writes to a location not shared with other cpus).
Edit: For clarity.
OK, thank you very much!