Data processor for concurrent executing of instructions by plural execution units

An information processing apparatus for executing sequentially-ordered instructions, which apparatus requires suppression of the execution of a subset of the sequentially ordered instructions, said subset including those instructions succeeding, in the sequential order, one of the sequentially ordered instructions when a predetermined result for an interrupt is generated as a result of execution of the one instruction, comprising:

• a plurality of execution means, each for executing an operation:
• storage means, connected to said plurality of execution means for storing result data obtained by said plurality of execution means;
• control means, connected to said plurality of execution means, for controlling execution of operations by said plurality of execution means, said control means including,
• first means for detecting whether or not a plurality of the instructions satisfy a predetermined condition, for enabling two or more of said plurality of execution means to concurrently start execution of operations required by the plurality of instructions when the plurality of instructions satisfy the predetermined condition, and for writing into said storage means result data generated by said two or more of said plurality of execution means for said plurality of instructions wherein the total number of said plurality of instructions is not larger than a total number of said plurality of execution means;
• interrupt means, connected to said plurality of execution means and responsive to a predetermined result for an interrupt generated by one of said two or more of said plurality of execution means executing an operation required by one of the plurality of instructions, for generating an interrupt signal;
• said control means further including:
• second means, responsive to the interrupt signal generated by said interrupt means, for preventing writing of result data from each of a group of said two more of said plurality of execution means that executes an operation required by an instruction succeeding said one instruction among the plurality of instructions into said storage means;
• wherein the predetermined condition includes a first condition based on a first execution time period required for execution of an operation required by each of said plurality of instructions and on a second execution time period required for execution of an operation required by each of instructions preceding to said one said plurality of instructions;
• and
• wherein said first condition is predetermined so that prevention by said second means of writing of a result data for each of instructions succeeding to said one of the plurality of instructions can be done before writing of the result data into said storage by said control means if an interrupt signal is generated in the execution of said one instruction, irrespective of which of the plurality of instructions is said one instruction.