2. Consider executing the following assembly code in MIPS five stage (IF, ID, EX, ME, WB) pipeline mod Loop: lw $t0, 0($s1) addi $t0,$t0, 1 sw $t0, 0(Ss1) addi $s1, $s1, 4 bne $s1, $s2, Loop wwww

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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2. Consider executing the following assembly code in MIPS five stage (IF, ID, EX, ME, WB) pipeline model:
Loop: lw $t0, 0($s1)
addi $t0,$t0, 1
sw $t0, 0($s1)
addi $s1, $s1, 4
bne $s1, $s2, Loop
Transcribed Image Text:2. Consider executing the following assembly code in MIPS five stage (IF, ID, EX, ME, WB) pipeline model: Loop: lw $t0, 0($s1) addi $t0,$t0, 1 sw $t0, 0($s1) addi $s1, $s1, 4 bne $s1, $s2, Loop
a. Assume there is only one memory port, data forwarding is not implemented, and branch instruction stalls until
the end of the WB stage. Complete the following pipeline execution diagram for one iteration. On average, how
many cycles are needed to finish one original iteration if there are infinite numbers of iterations?
1
2 3
8 9 10 11
12 13
15
lw $t0, 0(Ss1)
addi Sto, $t0, 1
sw $t0, 0(Ss1)
addi Ss1, $s1, 4
bne $$1,$s2, Loop
lw $t0, 0(Ss1)
(next iteration)
IF
ID
EX ME WB
b. Indicate all data dependences and their types (i.e., RAW, WAR, or WAW).
14
16 17 18
Transcribed Image Text:a. Assume there is only one memory port, data forwarding is not implemented, and branch instruction stalls until the end of the WB stage. Complete the following pipeline execution diagram for one iteration. On average, how many cycles are needed to finish one original iteration if there are infinite numbers of iterations? 1 2 3 8 9 10 11 12 13 15 lw $t0, 0(Ss1) addi Sto, $t0, 1 sw $t0, 0(Ss1) addi Ss1, $s1, 4 bne $$1,$s2, Loop lw $t0, 0(Ss1) (next iteration) IF ID EX ME WB b. Indicate all data dependences and their types (i.e., RAW, WAR, or WAW). 14 16 17 18
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