[llvm-bugs] [Bug 37601] New: [X86] Scheduler models should use UnsupportedFeatures to indicate unsupported ISAs

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37601

            Bug ID: 37601
           Summary: [X86] Scheduler models should use UnsupportedFeatures
                    to indicate unsupported ISAs
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: andrea.dibiagio at gmail.com, clement.courbet at gmail.com,
                    craig.topper at gmail.com, gchatelet at google.com,
                    llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com
            Blocks: 32325

We've mentioned this several times: [Bug #17367] [Bug #26792], [Bug #35608]

But we still don't make use of this field to indicate unsupported ISAs and
reduce test ranges.

NOTE: We must be careful with some models are they are reused on CPUs that DO
support extra ISAs (Haswell on KnightsLanding/KnightsMill), plus SandyBridge is
used as our current 'modern Generic cpu model' so needs to touch all ISAs.


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=32325
[Bug 32325] [META][X86] Improve implementation and use of X86 scheduler models
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