Let's compare a CISC machine versus a RISC machine on a standard program. Assume the following characteristics of the two machines. CISC: CPI of 6 for load/store, 3 for ALU and 7 for branch, CPU clock rate of 3.5 GHz RISC: CPI of 1.2 and a CPU clock rate of 1.75 GHz Since the CISC machine has more complex instructions, the Instruction Count (1) for the CISC machine is 25% smaller than the Instruction Count (I) for the RISC machine The standard program has a breakdown of 38% loads, 10% stores, 35% ALU operations, and 17% branches. Which machine will run the standard program in less time and by how much?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter4: Processor Technology And Architecture
Section: Chapter Questions
Problem 2PE: If a microprocessor has a cycle time of 0.5 nanoseconds, what’s the processor clock rate? If the...
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Let's compare a CISC machine versus a RISC machine on a standard program. Assume the
following characteristics of the two machines.
CISC: CPI of 6 for load/store, 3 for ALU and 7 for branch, CPU clock rate of 3.5 GHz
RISC: CPI of 1.2 and a CPU clock rate of 1.75 GHz
Since the CISC machine has more complex instructions, the Instruction Count (1) for the
CISC machine is 25% smaller than the Instruction Count (I) for the RISC machine
The standard program has a breakdown of 38% loads, 10% stores, 35% ALU operations,
and 17% branches.
Which machine will run the standard program in less time and by how much?
Transcribed Image Text:Let's compare a CISC machine versus a RISC machine on a standard program. Assume the following characteristics of the two machines. CISC: CPI of 6 for load/store, 3 for ALU and 7 for branch, CPU clock rate of 3.5 GHz RISC: CPI of 1.2 and a CPU clock rate of 1.75 GHz Since the CISC machine has more complex instructions, the Instruction Count (1) for the CISC machine is 25% smaller than the Instruction Count (I) for the RISC machine The standard program has a breakdown of 38% loads, 10% stores, 35% ALU operations, and 17% branches. Which machine will run the standard program in less time and by how much?
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