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Hi Nikos, You can model your requirement in the *.td using RegisterClass as def SrcRegs : RegisterClass<"Src", [i32], 4, (add R0, R2, R4, R6 )>; def DstRegs : RegisterClass<"Dst", [i32], 4, (add R1, R3, R5, R7 )>; Thanks ~Umesh On Thu, Nov 7, 2013 at 8:25 PM, Stavropoulos Nikos < n.stavropoulos at think-silicon.com> wrote: > Hi all.

Hi all. if there is limitation for the registers to be used together in an instruction, should i try to change it in the register allocation pass or should i try it somewhere else?? example. lets say we have to add 2 registers addu rx ,ry ,rz there is a limitation that says that the two regs that will be added they can not have the same mod4 so we can add r1 , r2 but cannot add r1,r5.