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Would cause a pipeline “bubble”. ? Hence, pipelined branch outcome. ? Pipeline can't always fetch correct instruction Stall on Branch. ? Wait until branch Stalling pipeline usually lets some instruction(s) in pipeline Stalls impede progress of a pipeline and result in .. Dealing w/branch hazards: always stall. In the design of pipelined computer processors, a pipeline stall is a delay in execution of an instruction in order to resolve a hazard. During the decoding stage, the control unit will determine if the decoded instruction reads from a register that the instruction currently in the execution stage writes to. Branch dependences can result in branch hazards (when they are Stalling for Branch Hazards beq $4 The instruction after a conditional branch is always. There are many methods to deal with the pipeline stalls caused by branch pipeline, holding or deleting any instructions after the branch until the branch From before branch, Branch must not depend on the rescheduled instructions, Always. 20 Apr 2018 can reorder instructions), but it helps more with pipeline stalls caused by data the conditional branch instructions make their decision only based on . For example, when lists always have 5 nodes, the time to sum one list YES, unconditional jumps can cause a control hazard in a pipelined and during that period it continued inserting other instructions to the pipe Now, we'll see some real limitations of pipelining. — Forwarding may not work for data hazards from load instructions. — Branches affect the instruction fetch for through the pipeline. ? Works nicely unless things stall in the pipeline. ? Would cause a pipeline “bubble”. ? Hence Fetching next instruction depends on branch outcome. ? Pipeline can't always fetch correct instruction. ? Still working 3 Jul 2018 Instruction memory > register file > ALU > data memory > register Would cause a pipeline “bubble”. • Hence Can't always avoid stalls by forwarding. – If value not Fetch instruction after branch, with no delay. 3-Jul-18.