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Loop Unrolling Transformation: Difference between revisions
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Loop unrolling is an optimization technique that reduces the number of iterations in a loop by expanding its body to process multiple elements per iteration. This transformation decreases loop overhead, improves execution efficiency, and can enhance opportunities for parallelization. By reducing control flow instructions, loop unrolling minimizes branching and increases instruction-level parallelism, making it particularly useful for performance-critical applications. While it can lead to larger code size, the trade-off often results in significant runtime improvements. | Loop unrolling is an optimization technique that reduces the number of iterations in a loop by expanding its body to process multiple elements per iteration. This transformation decreases loop overhead, improves execution efficiency, and can enhance opportunities for parallelization. By reducing control flow instructions, loop unrolling minimizes branching and increases instruction-level parallelism, making it particularly useful for performance-critical applications. While it can lead to larger code size, the trade-off often results in significant runtime improvements. | ||
== Partial and Full Loop Unrolling == | |||
Loop unrolling can be either partial or full. Partial unrolling reduces the number of iterations by a factor of N, where N is the unroll factor. The remaining iterations are processed in a separate loop. Full unrolling processes all iterations in a single loop, eliminating the loop construct entirely. | |||
== Loop Unrolling in C/C++ Compilers == | == Loop Unrolling in C/C++ Compilers == | ||
Most C/C++ compilers automatically unroll loops when optimization flags are enabled. However, you can also use compiler-specific pragmas to control loop unrolling behavior. These pragmas allow you to specify the unroll factor, enable or disable unrolling, or provide additional directives for loop unrolling. | |||
=== Loop unroll pragmas === | === Loop unroll pragmas === | ||