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Advantage of Zero register over the cost of implementing it ?

Hpc_me

Hi,

I've heard that the cost of implementing a register is more.

In ARMv8 there is a Zero register XZR/WZR, so what is the benefit of implementing such a register over the cost of implementing it?

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  • +1

    If you check out the AArch64 ISA you see the advantage: You can reduce the number of real opcodes if you have a dedicated register which returns 0 or discards the data written. I suspect the implementation is rather simple.

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  • +1

    If you check out the AArch64 ISA you see the advantage: You can reduce the number of real opcodes if you have a dedicated register which returns 0 or discards the data written. I suspect the implementation is rather simple.

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