Figure 5.38 gives the organization of a high performance floating – point unit used in IBM System/370 model 195. It is an independent floating – point unit without any dependence on the fixed – point ALU for mantissa operations. This provides both operand buffering and instruction buffering. The FILOS is the operator stack. The FLR is the set of floating – point registers. The FLB is the set of operand buffers. There are three execution units. The reservation stations in each execution unit allows concurrent operations by the execution unit. The extended execution unit handles extended – precision floating – point operands.