Home > Uncategorized > How Tomasulo (non Speculative) avoid WAW hazard

How Tomasulo (non Speculative) avoid WAW hazard

In non speculative Tomasulo, for each register, we designate how the corresponding register will get its value from.

i instruction : R1 = R3 + R4

i+1   instrction : R1  = R5 + R6

when i th instruction is in progress,  R1 will mark corresponding reservation station for this instruction who will provide value for R1.

Similarly, when (i+1)th instruction, is in progress, it will later update that value of R1 will come from the reservation station associated with (i+1) instruction.

Thus the value of (i+1) instruction will prevail avoiding WAW hazard.

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