If you use the -32 switch on the compiler command line, the 32-bit (ucode) compiler is invoked. If you use -64, the 64-bit compiler is run.
The default switches on Power Challenge Systems are -64 -mips4.
Although they are two separate and different compiler systems, the 32-bit and 64-bit compilers have similar command line interfaces. The following list summarizes the differences between the compilers in the switches that they support: