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• W3043382192 abstract "Multicores are now ubiquitous, but programmers still write sequential code. Speculative parallelization is an enticing approach to parallelize code while retaining the ease of sequential programming, making parallelism pervasive. However, prior speculative parallelizing compilers and architectures achieved limited speedups due to high costs of recovering from misspeculation and hardware scalability bottlenecks. We present T4, a parallelizing compiler that successfully leverages recent hardware features for speculative execution, which present new opportunities and challenges for automatic parallelization. T4 transforms sequential programs into trees of tiny timestamped tasks. T4 introduces novel compiler techniques to expose parallelism aggressively across the entire program, breaking applications into tiny tasks of tens of instructions each. Task trees unfold their branches in parallel to enable high task-spawn throughput while exploiting selective aborts to recover from misspeculation cheaply. T4 exploits parallelism across function calls, loops, and loop nests; performs new transformations to reduce task spawn costs and avoid false sharing; and exploits data locality among fine-grain tasks. As a result, T4 scales several hard-to-parallelize SPECCPU2006 benchmarks to tens of cores, on which prior work attained little or no speedup." @default.
• W3043382192 created "2020-07-23" @default.
• W3043382192 creator A5023312480 @default.
• W3043382192 creator A5032901878 @default.
• W3043382192 creator A5068748926 @default.
• W3043382192 date "2020-05-01" @default.
• W3043382192 modified "2023-09-26" @default.
• W3043382192 title "T4: Compiling Sequential Code for Effective Speculative Parallelization in Hardware" @default.
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• W3043382192 doi "https://doi.org/10.1109/isca45697.2020.00024" @default.
• W3043382192 hasPublicationYear "2020" @default.
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