[X86] Remove Schedule classes from models that don't use them

[RKSimon]

Bugzilla Link	35608
Resolution	FIXED
Resolved on	Aug 09, 2018 06:22
Version	trunk
OS	Windows NT
Blocks	#31672 #36479 #36256
CC	@adibiagio,@legrosbuffle,@topperc
Fixed by commit(s)	334389

Extended Description

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).

[llvmbot]

If I understand correctly it should be closed by D47763, right?

[RKSimon]

Resolving - for models that don't support a class we tag with X86WriteResUnsupported / X86WriteResPairUnsupported - rL334389

[RKSimon]

mentioned in issue #36256

[RKSimon]

mentioned in issue #36479