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23 Aug 2016 There are situations, called hazards, that prevent the next instruction in the instruction stream from executing during its designated cycle There are three cl
Pipelining hazards. • Pipeline hazards prevent next instruction from executing during designated clock cycle. • There are 3 classes of hazards: – Structural Hazards: • Arise from resource conflicts. • HW cannot support all possible combinations of instructions. – Data Hazards: • Occur when given instruction depends on data
Pipelines Hazards. Structural hazards: As mentioned above, structural hazards are those that occur because of resource conflicts. Most common type: When a functional unit is not fully pipelined . The use of the functional unit requires more than one clock cycle. If an instruction follows an instruction that is using it, and the
Control Hazards. This is lecture from my old class notes; it is more in line with my research point of view and less consistent with your text, but it is a good alternate introduction to branch prediction. Control Hazards. Instructions that disrupt the sequential flow of control present problems for pipelines. The effects of these
Effects of WAR and WAW. • These hazards are sometimes called name dependencies, as they occur because the processor has a finite number of registers. • If the processor had an infinite number of registers, it could use a different register for the output of each instruction, and WAW and. WAR hazards would never occur
5 Jan 2014
Bubbling the pipeline, also termed a pipeline break or pipeline stall, is a method to preclude data, structural, and branch hazards. As instructions are fetched, control logic determines whether a hazard could/will occur.
Pipeline hazards are situations that prevent the next instruction in the instruction stream from executing during its designated clock cycles. Any condition that causes a stall in the pipeline operations can be called a hazard. There are primarily three types of hazards: i. Data Hazards. ii. Control Hazards or
Instruction Hazards. Scoreboards are designed to control the flow of data between registers and multiple arithmetic units in the presence of conflicts caused by hardware resource limitations (structural hazards) and by dependencies between instructions (data hazards).
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