search for: mxmtargetlow

...M IR. They cannot be matched to the 8bit unsigned immediate add during Instruction Selection and will eventually be moved in a register. It would be better to transform these adds with small negative immediates into subs during Target Lowering. So I tried to custom lower ISD::ADD in IselLowering: MxmTargetLowering::MxmTargetLowering(TargetMachine &TM) : TargetLowering(TM, new TargetLoweringObjectFileELF()) { [...] setOperationAction(ISD::ADD, MVT::i32, Custom); [...] } //check for immediate adds with constant values -256 < x < 0 and transform them //to sub SDValue MxmTargetLowering::LowerAD...