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Is there a way to define a register class that is storage-only? I want to have an i8 register class that I can use for loads/stores/converts, but that does not support arithmetic. It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, as the legalizer just looks at whether or not the underlying type is legal (which it is). So come instruction selection time I still have i8 adds. Do I need to custom handle all 8-bit arithmetic, or...

...On Aug 8, 2013, at 7:35 AM, Justin Holewinski <justin.holewinski at gmail.com> wrote: > Is there a way to define a register class that is storage-only? I want to have an i8 register class that I can use for loads/stores/converts, but that does not support arithmetic. > > It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, as the legalizer just looks at whether or not the underlying type is legal (which it is). So come instruction selection time I still have i8 adds. Do I need to custom handle all 8-bit arithmetic, or...

...in Holewinski <justin.holewinski at gmail.com> > wrote: > > > Is there a way to define a register class that is storage-only? I want > to have an i8 register class that I can use for loads/stores/converts, but > that does not support arithmetic. > > > > It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and > SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, as the > legalizer just looks at whether or not the underlying type is legal (which > it is). So come instruction selection time I still have i8 adds. Do I > need to custom handle all...

...> > > > > > Is there a way to define a register class that is storage-only? I > want > > > to have an i8 register class that I can use for loads/stores/converts, > but > > > that does not support arithmetic. > > > > > > > > It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and > > > SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, as > the > > > legalizer just looks at whether or not the underlying type is legal > (which > > > it is). So come instruction selection time I still have i8 add...

...at gmail.com> > > wrote: > > > > > Is there a way to define a register class that is storage-only? I want > > to have an i8 register class that I can use for loads/stores/converts, but > > that does not support arithmetic. > > > > > > It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and > > SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, as the > > legalizer just looks at whether or not the underlying type is legal (which > > it is). So come instruction selection time I still have i8 adds. Do I > > need t...

...Is there a way to define a register class that is storage-only? I > > want > > > > to have an i8 register class that I can use for loads/stores/converts, > > but > > > > that does not support arithmetic. > > > > > > > > > > It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and > > > > SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, as > > the > > > > legalizer just looks at whether or not the underlying type is legal > > (which > > > > it is). So come instruction selection...

...s that is storage-only? > I > > > want > > > > > to have an i8 register class that I can use for > loads/stores/converts, > > > but > > > > > that does not support arithmetic. > > > > > > > > > > > > It seems addOperationAction(ISD::ADD, MVT::i8, Promote) and > > > > > SetPromotedToType(ISD::ADD, MVT::i8, MVT::i16) are not sufficient, > as > > > the > > > > > legalizer just looks at whether or not the underlying type is legal > > > (which > > > > > it is)....