[llvm-bugs] [Bug 50355] New: [MCA] More flexible (per-group?) issue width
via llvm-bugs
llvm-bugs at lists.llvm.org
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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