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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. | ||
== Loop Unrolling in C/C++ Compilers == | |||
=== Loop unroll pragmas === | |||
* #pragma unroll(n) | |||
* #pragma nounroll | |||
Clang pragmas | |||
* #pragma clang loop unroll(enable) | |||
* #pragma clang loop unroll(disable) | |||
* #pragma clang loop unroll(full) | |||
* #pragma clang loop unroll_count(4) | |||
GCC | |||
* #pragma GCC unroll | |||
* #pragma GCC nounroll | |||
* #pragma GCC unroll(UNROLLCOUNT) | |||
OpenMP | |||
* #pragma omp unroll | |||
* #pragma omp unroll full | |||
* #pragma omp unroll partial | |||
* #pragma omp unroll partial(3) | |||
==Loop Unrolling Transformation in emmtrix Studio== | ==Loop Unrolling Transformation in emmtrix Studio== | ||
emmtrix Studio implements loop unrolling using #pragma directives or via the GUI. Unrolling will reduce the iteration count and increase the body of the loop, processing statements from multiple iteration steps in a single iteration. | emmtrix Studio implements loop unrolling using #pragma directives or via the GUI. Unrolling will reduce the iteration count and increase the body of the loop, processing statements from multiple iteration steps in a single iteration. | ||