Pipelined data processing system

A data processing system for executing each of a plurality of instructions in a plurality of stages in a pipeline mode, comprising:

• means for sequentially decoding executable instructions to produce data necessary for the execution of the respective stages;
• a first operation unit capable of carrying out operations requird by a plurality of instructions;
• first store means for storing data produced by the operation of the instructions by said first operation unit;
• a second operation unit capable of carrying out operations required by a portion of said plurality of instructions;
• second store means for storing data produced by the operation of the instructions by said second operation unit;
• and
• control means for controlling execution of the instruction including means for storing the data produced by said second operation unit into said second store means at least one operation stage earlier than the storing of the data produced by said first operation unit into said first store means, means for detecting an interruption, and means responsive to the detection of the interruption for storing the content of said first store means into said second store means.

A data processing system for executing each of a plurality of instructions in a plurality of stages in a pipeline mode, comprising:

• means for sequentially decoding executable instructions to produce data necessary for the execution of the respective stages;
• a first operation unit capable of carrying out operations required by a plurality of instructions;
• first store means for storing data produced by the operation of said instructions by said first operation unit;
• a second operation unit capable of carrying out operations required by a portion of said plurality of instructions;
• second store means for storing data produced by the operation of the instructions by said second operation unit;
• means for evacuating the content of said second store means before the data produced by said second operation unit is stored in said second store means;
• and
• control means for controlling the execution of the instructions including means for storing the data produced by said second operation unit into said second store means at least one operation stage earlier than the storing of the data produced by said first operation unit into said first store means, means for detecting an interruption, and means responsive to the detection of the interruption for restoring the evacuated content of said evacuation means to said second store means.