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...appropriate basic blocks. Also, you can only use physical registers in COPY instructions, either as the source, or as the destination. You should not use non-reserved physical registers directly in instructions. For example, you'd have something like this: %virt_reg0 = COPY $phys_reg %virt_reg1 = some_instr %virt_reg0, ... $phys_reg = COPY %virt_reg1 The functions "load/store from stack slot" are used for spills/restores. They do exactly what their names suggest and they are not required to be used (unless, of course, you want to generate a load/store). In the code snippe...

...in appropriate basic blocks. Also, you can only use physical registers in COPY instructions, either as the source, or as the destination. You should not use non-reserved physical registers directly in instructions. For example, you'd have something like this: %virt_reg0 = COPY $phys_reg %virt_reg1 = some_instr %virt_reg0, ... $phys_reg = COPY %virt_reg1 The functions "load/store from stack slot" are used for spills/restores. They do exactly what their names suggest and they are not required to be used (unless, of course, you want to generate a load/store). In the code snippet...

Hi, In the context of MachineCode custom inserter, I'm trying to enforce the mapping of virtual register to a physical one. According to the documentation https://llvm.org/docs/CodeGenerator.html#mapping-virtual-registers-to-physical-registers There are two ways: the direct one and the indirect ones. The indirect ones refer VirtRegMap class that I've never found. So I tried the direct