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2019 Mar 25
2
Overlapping register groups in old 8-bit MC6809 processor.
...; subregs, list<string> alt = []> : RegisterWithSubRegs<n, subregs> { field bits<4> Num = num; let Namespace = "MC6809"; let HWEncoding{3-0} = num; let AltNames = alt; } def sub_lo_byte : SubRegIndex<8, 8>; def sub_hi_byte : SubRegIndex<8>; def sub_lo_word : SubRegIndex<16, 16>; def sub_hi_word : SubRegIndex<16>; //===----------------------------------------------------------------------===// // Registers //===----------------------------------------------------------------------===// def IX : MC6809Reg<1, "x">; def IY...