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Single-Instruction Multiple-Data Execution
Single-Instruction Multiple-Data Execution
Single-Instruction Multiple-Data Execution

Single-Instruction Multiple-Data Execution (Synthesis Lectures on Computer Architecture)

Product ID : 38244283

Galleon Product ID 38244283
UPC / ISBN 1627057633
Shipping Weight 0.45 lbs
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Binding: Paperback
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Shipping Dimension 9.21 x 7.4 x 0.31 inches
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Author Christopher J. Hughes
Number Of Pages 121
Publication Date 2015-05-05

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About Single-Instruction Multiple-Data Execution

Having hit power limitations to even more aggressive out-of-order execution in processor cores, many architects in the past decade have turned to single-instruction multiple-data (SIMD) execution to increase single-threaded performance. SIMD execution, or having a single instruction drive execution of an identical operation on multiple data items, was already well established as a technique to efficiently exploit data parallelism. Furthermore, support for it was already included in many commodity processors. However, in the past decade, SIMD execution has seen a dramatic increase in the set of applications using it, which has motivated big improvements in hardware support in mainstream microprocessors. The easiest way to provide a big performance boost to SIMD hardware is to make it wider, i.e., increase the number of data items hardware operates on simultaneously. Indeed, microprocessor vendors have done this. However, as we exploit more data parallelism in applications, certain challenges can negatively impact performance. In particular, conditional execution, non-contiguous memory accesses, and the presence of some dependences across data items are key roadblocks to achieving peak performance with SIMD execution. This book first describes data parallelism, and why it is so common in popular applications. We then describe SIMD execution, and explain where its performance and energy benefits come from compared to other techniques to exploit parallelism. Finally, we describe SIMD hardware support in current commodity microprocessors. This includes both expected design tradeoffs, as well as unexpected ones, as we work to overcome challenges encountered when trying to map real software to SIMD execution.