Instruction Level Parallelism (ILP) Colin Stevens.

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Presentation transcript:

Instruction Level Parallelism (ILP) Colin Stevens

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 Parallelism ► for (i=1; i<=1000; i= i+1) x[i] = x[i] + y[i];  Thread level Parallelism (SMT, multi-core computers)

Making Computers Think Parallel ► Human  Write code yourself, directly controlling each processor ► Compiler  Let the compiler convert your sequential code into parallel instructions. ► Hardware

Implementations of ILP ► Pipelining ► Superscalar Architecture  Dependency checking on chip.  Multiple Processing Elements eg. ALU, Shift ► VLIW (Very Long Instruction Word Architecture)  Simple hardware, Complex Compiler ► Multi processor computers

► Pipelining ► Superscalar

Identifying parallel instructions ► Hardware Techniques  Out of order execution ► Window Size  Speculative execution ► Branch Prediction ► Branch Fanout ► Compiler Techniques  Register Renaming ADD $t0,$s1,$2 SW $t0, 0($s3) ADD $t0,s$4,$s5 SW $t0, 0($s6)  Unrolling loops ► Takes advantage of loop level parallelism

References ► ► ► ► ► ►