[llvm-bugs] [Bug 35548] New: [X86] Warn if a scheduling instregex doesn't alter the default schedule

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35548

            Bug ID: 35548
           Summary: [X86] Warn if a scheduling instregex doesn't alter the
                    default schedule
           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,
                    andrew.v.tischenko at gmail.com, gadi.haber at intel.com,
                    llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com
            Blocks: 32325

Scheduler model instregex entries only need to be added if they alter the
behaviour of an instruction's default scheduling class/itinerary.

If the instregex is effectively useless, then tablegen should at least emit a
debug warning reporting that.


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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