[llvm-bugs] [Bug 42792] New: Update llvm-exegesis to use libLLVMMCA to predict scheduling

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42792

            Bug ID: 42792
           Summary: Update llvm-exegesis to use libLLVMMCA to predict
                    scheduling
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-exegesis
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: andrea.dibiagio at gmail.com, clement.courbet at gmail.com,
                    gchatelet at google.com, lebedev.ri at gmail.com,
                    llvm-bugs at lists.llvm.org

The scheduling modelling in
llvm\tools\llvm-exegesis\lib\SchedClassResolution.cpp should be replaced to
call the equivalent functionality in libLLVMMCA.

We shouldn't have two implemenations, and there are minor differences between
them which means that we can't easily use llvm-exegesis to confirm the model
matches the hardware's behaviour [Bug #37697].

This will then let us easily check the models for special predicate cases (move
idioms, dependency breakers etc.)

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