Question

Detect hazards in the following program. Associate the hazard type with the instruction causing the hazard.

1a. EX/MEM.RegisterRd = ID/EX.RegisterRn1

1b. EX/MEM.RegisterRd = ID/EX.RegisterRm2

2a. MEM/WB.RegisterRd = ID/EX.RegisterRn1

2b. MEM/WB.RegisterRd = ID/EX.RegisterRm2

LDUR X3, [X21, #43]

ADD X4, X3, X2

SUB X6, X8, X7

LSL X5, X1, #3

SUB X18, X9, X5

Answer 1

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Hazard means : Average execution cycles of program increases due to stalls is known as Hazard

It can be happen due to any type of dependencies between two or more instructions like Data dependency, control Dependency or Structural Dependency which causes Hazards

X3 causes dependency between I2 - I1

And X5 causes dependency between I5 - I4