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Estructura de Computadores (2025-26, Grado en Ingeniería del Software. Plan 2023 Grupo B, Grado en Ingeniería Informática. Plan 2023 Grupo B y Grado en Matemáticas + Ingeniería Informática. Plan 2023 Grupo B)
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Find the speed-up of a processor in which we have improved the ALU. With the new ALU, the speed-up of the arithmetic-logic operations is 54% (the remaining instructions -no arithmetic instructions- keep the same speed). We also know that the 28% of the computation time is dedicated to arithmetic-logic operations in the original processor (give the answer using three decimals).
Given the RISC-V instruction:
ADD x20,x11,x9
Calculate its codification accoding to the RISC-V format. GIVE THE RESULT IN DECIMAL (sugg. see slide 11)
Assume that after the execution of the comand "time" in Unix, you now that the percentage of the execution devoted to the CPU time is 80%. If the elapsed time is 140.1 s. and the System CPU time is 24.2 s., calculate the User CPU time