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2015 Jan 11
2
[LLVMdev] Backend Tablegen Instruction Definition
...iffer in that they have no input registers (only the target). The system instructions are defined as: rdcycle Rt I’ve defined a stand-alone instruction definition (as opposed to using the type-I template) that is as follows: //rdcycle def RDCYCLE: InstRISCV<4, (outs GR32:$dst), (ins), ([set GC32:$dst])>{ field bits<32> Inst; bits<5> dst; let Inst{31-20} = 0b000000000000; let Inst{19-15} = 0b00000; let Inst{14-12} = 0b010; let Inst{11- 7} = dst; let Inst{6 - 0} = 0b1110011; } However, the compilation fails with...