Why are the temporary registers split in the MIPS ISA? [closed]

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I'm currently taking a class that covers the MIPS ISA and one thing that I noticed is the split in temporary registers:

Temporary registers $t0 to $t7 are stored in $8 to $15, but $t8 and $t9 are stored in $24 and $25. Why is this? Why not make the temporary registers consecutive?

来源：https://stackoverflow.com/questions/54351149/why-are-the-temporary-registers-split-in-the-mips-isa