a 5-stage pipeline (IF, ID, EX, MEM, WB) processor implementa nat does use bypassing/forwarding and does NOT use delayed branches. Assume that register reads can occur in the same cycle that the register write-backs are done. For the below code, how many stalls will be observed? Assume that the loop runs a total of 1024 times. Label: Idw r8, 0(r10) ; load into r8 from MEM[0+r10] add r9, r8, r7; r9 = r8 + r7 stw r9, 0(r12); store r9 into MEM[0+r12] addi r10, r10, 4; r10 = r10 + 4 addi r12, r12, 4; r12 = r12 + 4 bne r10, r11, Label; branch to Label if r10 != r11

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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1. Consider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor implementation that does NOT use
bypassing/forwarding and does NOT use delayed branches. Assume that register reads can
occur in the same cycle that the register write-backs are done. For the below code, how many
stalls will be observed? Assume that the loop runs a total of 1024 times.
Label: Idw r8, 0(r10) ; load into r8 from MEM[0+r10]
add r9, r8, r7; r9 = r8 + r7
stw r9, 0(r12); store r9 into MEM[0+r12]
addi r10, r10, 4; r10 = r10 + 4
addi r12, r12, 4; r12 = r12 + 4
bne r10, r11, Label; branch to Label if r10 != r11
Transcribed Image Text:1. Consider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor implementation that does NOT use bypassing/forwarding and does NOT use delayed branches. Assume that register reads can occur in the same cycle that the register write-backs are done. For the below code, how many stalls will be observed? Assume that the loop runs a total of 1024 times. Label: Idw r8, 0(r10) ; load into r8 from MEM[0+r10] add r9, r8, r7; r9 = r8 + r7 stw r9, 0(r12); store r9 into MEM[0+r12] addi r10, r10, 4; r10 = r10 + 4 addi r12, r12, 4; r12 = r12 + 4 bne r10, r11, Label; branch to Label if r10 != r11
2. Consider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor implementation that uses
bypassing/forwarding and 1-cycle branch delay slot. For the below code, how many stalls will be
observed? Assume that the loop runs a total of 1024 times.
Label: Idw r8, 0(r10) ; load into r8 from MEM[0+r10]
add r9, r8, r7; r9 = r8 + r7
addi r10, r10, 4; r10 = r10 + 4
addi r12, r12, 4; r12 = r12 + 4
bne r10, r11, Label; branch to Label if r10 != r11
stw r9, -4(r12); store r9 into MEM[-4+r12]
Transcribed Image Text:2. Consider a 5-stage pipeline (IF, ID, EX, MEM, WB) processor implementation that uses bypassing/forwarding and 1-cycle branch delay slot. For the below code, how many stalls will be observed? Assume that the loop runs a total of 1024 times. Label: Idw r8, 0(r10) ; load into r8 from MEM[0+r10] add r9, r8, r7; r9 = r8 + r7 addi r10, r10, 4; r10 = r10 + 4 addi r12, r12, 4; r12 = r12 + 4 bne r10, r11, Label; branch to Label if r10 != r11 stw r9, -4(r12); store r9 into MEM[-4+r12]
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