Hi I was playing with the number of physical registers for an experiment. I observe the following:
ARM config file has numPhysVecRegs to be 48. This means after gem5 initializes the rename map (in cpu constructor src/o3/cpu.cc ) the size of the free list should be 48 - architectural registers, i.e, 48 -32 = 16. However, I see that the free list size after the rename map initialization for VectorRegisters is 4. Which means the architectural registers are 44 in number. I am not sure if that's the case. Please correct me if I am wrong. Also, a free list size of 4 essentially means that considering instructions with single destination registers, there can be only 4 of them in flight at a moment till the new instruction commits and previous physical registers are freed up from the renameHistory buffer. But I think that's too less. This happens with the numPhysIntRegs (128), Post rename-map initialization it comes to be 86 ie 42 architectural registers. Which should not be the case. What do you think? Thanks -- *GS Nitesh Narayana <https://nitesh8998.gitlab.io/>* Departament d'Arquitectura de Computadors Webpage: nitesh8998.gitlab.io
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