Before revision: RISC microprocessors like these were the first to have superscalar execution, because RISC architectures free transistors and die area which can be used to include multiple execution units (this was why RISC designs were faster than CISC designs through the 1980s and into the 1990s ).
After revision: and the traditional uniformity of the instruction set favors superscalar dispatch, and it's far more complicated to do multiple dispatch when instructions have variable bit lengthRISC microprocessors like these were the first to have superscalar execution, because RISC architectures free transistors and die area which can be used to include multiple execution units (this was why RISC designs were faster than CISC designs through the 1980s and into the 1990s ).