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rdcycle
2015 Jan 11
2
[LLVMdev] Backend Tablegen Instruction Definition
...ISCV LLVM backend, I’m running into some trouble in defining the instruction formats for the system instruction. The system instructions follow a pre-defined instruction template (type-I), but differ 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} = 0b0...