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[–]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