[llvm-bugs] [Bug 50355] New: [MCA] More flexible (per-group?) issue width

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Sat May 15 13:35:13 PDT 2021


https://bugs.llvm.org/show_bug.cgi?id=50355

            Bug ID: 50355
           Summary: [MCA] More flexible (per-group?) issue width
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-mca
          Assignee: unassignedbugs at nondot.org
          Reporter: lebedev.ri at gmail.com
                CC: andrea.dibiagio at gmail.com, llvm-bugs at lists.llvm.org,
                    matthew.davis at sony.com

Related to the bug #50350 and bug #50353.

One more thing to think about, we might also need to be able to specify
issue width in more cases. I believe, and please correct me if i'm wrong,
currently we can only specify a global issue width.
And that will be suboptimal after #50350:

AMD SOG 19h,2.10.1 Schedulers
The schedulers can receive up to six macro ops per cycle,
with a limit of two per scheduler. Each scheduler can issue
one micro op per cycle into each of its associated pipelines
shown in the diagram.

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