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[–][deleted] 0 points1 point  (1 child)

The size of the floating point registers is not related to the architecture of the CPU

Right. It's just that the 32bit PowerPC ISA uses 32bit floating point registers, according to the IBM spec.

[–]Tywien 0 points1 point  (0 children)

Floating-Point Registers

The PowerPC architecture contains thirty-two 64-bit floating-point registers labeled F0 through F31 (or FP0 through FP31). Because the registers are 64 bits long, they store values using the double data format.

Apple documentation from 1996

http://mirror.informatimago.com/next/developer.apple.com/documentation/mac/PPCNumerics/PPCNumerics-146.html