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structural hazards
instruction hazards in computer organization
data hazards
how to overcome data hazards
pipeline hazards and solutions
data hazard example
instruction hazards in pipelining
control hazards in pipelining
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
Structural Hazards. They arise from resource conflicts when the hardware cannot support all possible combinations of instructions in simultaneous overlapped execution. Data Hazards. Control Hazards.They arise from the pipelining of branches and other instructions that change the PC.
If you're a hardware designer OR a complier writer, you need to be aware of how HLL is mapped to assembly instructions AND what HW is used to execute a sequence of assembly instructions. • Otherwise, it is quite possible to always have built in inefficiencies. 4
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
5 Jan 2014
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).
Pipelining hazards and solutions - Three types of pipeline hazards. Data hazards arise because of the unavailability of an operand. For example, an instruction may require an operand that will be the result of a preceding, still uncompleted instruction. Structural hazards may arise from some combinations of instructions that
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.
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