[llvm-bugs] [Bug 42286] New: [llvm-mca] Even better handling for "unsupported" instructions

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jun 14 08:26:47 PDT 2019


            Bug ID: 42286
           Summary: [llvm-mca] Even better handling for "unsupported"
           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

Currently, llvm-mca complains only if the instruction is marked
as unsupported in the sched model. That isn't ideal, in order to
get it right, one needs to somehow keep track of every instruction,
and mark unsupported as such, via InstRW.

But that info is already there, the llvm knows what instruction
sets are supported by what cpu.
It would be great to simply make use of that info.

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