[llvm-bugs] [Bug 35608] New: [X86] Remove Schedule classes from models that don't use them
llvm-bugs at lists.llvm.org
Sun Dec 10 08:50:01 PST 2017
Bug ID: 35608
Summary: [X86] Remove Schedule classes from models that don't
OS: Windows NT
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: llvm-dev at redking.me.uk
CC: llvm-bugs at lists.llvm.org
We currently have to specify all the InstrSchedModel classes even if the model
doesn't support it (e.g. WriteVarVecShift on pre-AVX2 machines).
We should be able to not have to include these as long as the model's
UnsupportedFeatures list agrees. Naturally if we try to attach the model to a
cpu that does support that feature we should error out (e.g. X86ScheduleHaswell
being used on KNL).
[Bug 32325] [META][X86] Improve implementation and use of X86 scheduler models
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