The Free On-line Dictionary of Computing (30 December 2018):

Microprocessor without Interlocked Pipeline Stages
MIPS project

    (MIPS) A project at Stanford University intended
   to simplify processor design by eliminating hardware
   interlocks between the five pipeline stages.  This means
   that only single execution cycle instructions can access the
   thirty two 32-bit general registers, so that the compiler
   can schedule them to avoid conflicts.  This also means that
   LOAD/STORE and branch instructions have a one-cycle delay to
   account for.  However, because of the importance of multiply
   and divide instructions, a special HI/LO pair of
   multiply/divide registers exist which do have hardware
   interlocks, since these take several cycles to execute and
   complicate instruction scheduling.

   The project eventually lead to the commercial MIPS R2000
   processor.

   (1995-02-09)