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> What you said is not true. On everything >= SuperSPARC and everything >= i387, the FPU is at least 64-bits.
I didn't deny that. Actually quite the opposite.
Often it's 80bit or even 128bit.
FPU Datatypes (differ from platform to platform):
float: most often 32bit
double: >= 64bit (eg. on ix86 it's 80bit internally)
long double: 80bit or 128bit
But ... the load/store of the 64bit/128bit values is slower for 32bit builds than for 64bit builds, amongst other things (eg. conversation etc.)
The performance for >=64bit floating point arithmetic (at least double precision) is *slower* for 32bit systems than on 64bit systems. It's not a huge difference, but noticable.