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Are there a specific set of MIPS operations which cause a bubble or noOp? Or is it just dependent on which registers will be needed for subsequent calls? Outside of predictive methods for branching, does a branch always cause two noOps?

LW R2 0(R1)
Label1:         BEQ R2 R0 Label2    #not taken once then taken
        LW R3 0(R2)
        BEQ R3 R0 Label1    #taken
        ADD R1 R3 R1
Label2      AS R1 0(R2)
William Stidhem
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1 Answers1

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According to this, NOP (no operation):

sll $0,$0,0

I also believe that every instruction that has $0 as its destination register is a NOOP.

Thanakron Tandavas
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