FPU is located in:
float/src/DS3100/FPU.i3
float/src/VAX/FPU.i3
float/src/IRIX5/FPU.i3
float/src/IEEE-default/FPU.i3
float/src/SUN386/FPU.i3
float/src/SOLsun/FPU.i3
float/src/SPARC/FPU.i3