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instruction level parallelism in computer architecture pdf
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Instruction-level Parallelism CILP) is a family of processor and compiler design techniques that speed up execution by causing individual machine operations to execute in parallel. Although ILP has appeared in the highest performance uniprocessors for the past 30 years, the 1980s saw it become a much more significant
SIMD instructions, Vector processors, GPUs. ? Multiprocessor. – Symmetric shared-memory multiprocessors. – Distributed-memory multiprocessors. – Chip-multiprocessors a.k.a. Multi-cores. ? Multicomputers a.k.a. clusters. ? Parallelism in Software. ? Instruction level parallelism. ? Task-level parallelism. ? Data parallelism.
Instruction Level Parallelism. Pipelining can overlap the execution of instructions when they are independent of one another. This potential overlap among instructions is called instruction-level parallelism (ILP) since the instructions can be evaluated in parallel.
Instruction-level parallelism. 0 By overlapping the execution of multiple instructions, we obtain ILP. 0 To maximize ILP, we want to execute instructions in program order except when it doesn't affect the result of the program. 0 Three types of dependences which can cause hazards. 0 True/data: an instruction depends on
What is a parallel instruction? ILP is a measure of the number of instructions that can be performed during a single clock cycle. Parallel instructions are a set of instructions that do not depend on each other to be executed. Hierarchy. Bit level Parallelism. 16 bit add on 8 bit processor. Instruction level Parallelism; Loop level
Instruction-level parallelism (ILP) is a measure of how many of the instructions in a computer program can be executed simultaneously. There are two approaches to instruction level parallelism: Hardware.
Scheduling. • Central problem to ILP processing. – need to determine when parallelism (independent instructions) exists. – in Pentium example, decode stage checks for multiple conditions: •is there a data dependency? – does one instruction generate a value needed by the other? – do both instructions write to the same
Instruction vs Machine Parallelism. • Instruction-level parallelism (ILP) of a program—a measure of the average number of instructions in a program that, in theory, a processor might be able to execute at the same time. • Mostly determined by the number of true (data) dependencies and procedural (control) dependencies in.
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