2. Refer to the following table for the data required. Arith Store Load Branch I

Question

2. Refer to the following table for the data required. Arith Store Load Branch Instructions for 500 150 10o 100o a program CPI 5 5 2 a. b. c. d. Calculate execution time of a program on a 2 GHz processor. Find global CPl of the program If number of load instructions can be reduced by one-half, what is the speed up and CPI? If number of store and arithmetic instructions can be reduced by one-half, what is the speed up and CPI? Write MIPS code to implement a leaf procedure for the following C function: int leaf_procedure (int x, int y) 3. int i, a; arxty i =x-2; a-a+i return a;

Explanation / Answer

3)

The MIPS code for implementing a leaf procedure for the given c function is given below:

code:

.file 1 ""

.section .mdebug.abi32

.previous

.nan legacy

.module fp=32

.module nooddspreg

.abicalls

.text

.align 2

.globl leaf_procedure

.set nomips16

.set nomicromips

.ent leaf_procedure

.type leaf_procedure, @function

leaf_procedure:

.frame $fp,24,$31 # vars= 8, regs= 1/0, args= 0, gp= 8

.mask 0x40000000,-4

.fmask 0x00000000,0

.set noreorder

.set nomacro

addiu $sp,$sp,-24

sw $fp,20($sp)

move $fp,$sp

sw $4,24($fp)

sw $5,28($fp)

movz $31,$31,$0

lw $3,24($fp)

lw $2,28($fp)

nop

addu $2,$3,$2

sw $2,8($fp)

lw $2,24($fp)

nop

addiu $2,$2,-2

sw $2,12($fp)

lw $3,8($fp)

lw $2,12($fp)

nop

addu $2,$3,$2

sw $2,8($fp)

lw $2,8($fp)

move $sp,$fp

lw $fp,20($sp)

addiu $sp,$sp,24

j $31

nop

.set macro

.set reorder

.end leaf_procedure

.size leaf_procedure, .-leaf_procedure

.ident "GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.1) 5.4.0 20160609"

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