https://bugs.llvm.org/show_bug.cgi?id=39828
Bug ID: 39828
Summary: [llvm-mca] Add a 'memory' event type to track
load/store queue usage.
Product: tools
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: llvm-mca
Assignee: unassignedb...@nondot.org
Reporter: andrea.dibia...@gmail.com
CC: andrea.dibia...@gmail.com, llvm-bugs@lists.llvm.org,
matthew.da...@sony.com
Once https://reviews.llvm.org/D54957 is committed, class SchedulerStatistics
will start correctly tracking the load/store queue consumption in the LSUnit.
However, SchedulerStatistics will work under the assumption that load/store
queue
entries are reserved at 'instruction dispatched' stage, and released at
'instruction executed' stage. This currently matches the behavior of LSUnit.
That design will minimize the number of events generated by the
Dispatch/Execute stages, at the cost of doing extra bookkeeping in method
`onEvent()`. It also introduces a subtle (not-so-nice) dependency with how the
LSUnit works internally.
In future, we should add a new "memory queue" event type, so that
SchedulerStatistics will stop making assumptions on when/how queue entries are
allocated by the LSUnit.
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