1. A method of executing a linear algebra subroutine, said method comprising: for an execution code controlling operation of a floating point unit (FPU) performing said linear algebra subroutine execution, unrolling an instruction to preload data into a floating point register (FReg) of said FPU, said unrolling causing said instruction to load data into said FReg to be inserted into a sequence of instructions that execute said linear algebra subroutine on said FPU.