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共 567 条记录，以下是181-190 订阅

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Example-Guided Synthesis of Relational Queries 2021

Example-Guided Synthesis of Relational Queries

引用

42nd acm sigplan International conference on programming language design and implementation (pldi)

作者： Thakkar, Aalok Naik, Aaditya Sands, Nathaniel Alur, Rajeev Naik, Mayur Raghothaman, Mukund Univ Penn Philadelphia PA 19104 USA Univ Southern Calif Los Angeles CA 90007 USA

ISBN: (纸本)9781450383912

Program synthesis tasks are commonly specified via input-output examples. Existing enumerative techniques for such tasks are primarily guided by program syntax and only make indirect use of the examples. We identify a class of synthesis algorithms for programming-by-examples, which we call Example-Guided Synthesis (EGS), that exploits latent structure in the provided examples while generating candidate programs. We present an instance of EGS for the synthesis of relational queries and evaluate it on 86 tasks from three application domains: knowledge discovery, program analysis, and database querying. Our evaluation shows that EGS outperforms state-of-the-art synthesizers based on enumerative search, constraint solving, and hybrid techniques in terms of synthesis time, quality of synthesized programs, and ability to prove unrealizability.

关键词： programming by example Example-Guided Synthesis

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Synthesising Graphics Card Programs from DSLs 12

Synthesising Graphics Card Programs from DSLs

引用

33rd acm sigplan conference on programming language design and implementation

作者： Cartey, Luke Lyngsoe, Rune de Moor, Oege Univ Oxford Oxford OX1 2JD England

ISBN: (纸本)9781450312059

Over the last five years, graphics cards have become a tempting target for scientific computing, thanks to unrivaled peak performance, often producing a runtime speed-up of x10 to x25 over comparable CPU solutions. However, this increase can be difficult to achieve, and doing so often requires a fundamental rethink. This is especially problematic in scientific computing, where experts do not want to learn yet another architecture. In this paper we develop a method for automatically parallelising recursive functions of the sort found in scientific papers. Using a static analysis of the function dependencies we identify sets - partitions - of independent elements, which we use to synthesise an efficient GPU implementation using polyhedral code generation techniques. We then augment our language with DSL extensions to support a wider variety of applications, and demonstrate the effectiveness of this with three case studies, showing significant performance improvement over equivalent CPU methods, and similar efficiency to hand-tuned GPU implementations.

关键词： language Performance gpu scientific applications program synthesis dynamic programming

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Taming the IXP network processor

Taming the IXP network processor

引用

conference on programming language design and implementation

作者： George, L Blume, M Toyota Technol Inst Chicago Chicago IL USA

We compile Nova, a new language designed for writing network processing applications, using a back end based on integer-linear programming (ILP) for register allocation, optimal bank assignment, and spills. The compiler's optimizer employs CPS as its intermediate representation;some of the invariants that this IR guarantees are essential for the formulation of a practical ILP model. Appel and George used a similar ILP-based technique for the IA32 to decide which variables reside in registers but deferred the actual assignment of colors to a later phase. We demonstrate how to carry over their idea to an architecture with many more banks, register aggregates, variables with multiple simultaneous register assignments, and, very importantly, one where bank- and register-assignment cannot be done in isolation from each other. Our approach performs well in practise-without causing an explosion in size or solve time of the generated integer linear programs.

关键词： network processors Intel IXA integer linear programming register allocation bank assignment programming languages code generation

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The liberty structural specification language: A high-level modeling language for component reuse

The liberty structural specification language: A high-level ...

引用

Proceedings of the 2004 acm sigplan conference on programming language design and implementation (pldi'04)

作者： Vachharajani, Manish Vachharajani, Neil August, David I. Department of Computer Science Princeton University Princeton NJ 08544 United States

Rapid exploration of the design space with simulation models is essential for quality hardware systems research and development. Despite striking commonalities across hardware systems, designers routinely fail to achieve high levels of reuse across models constructed in existing general-purpose and domain-specific languages. This lack of reuse adversely impacts hardware system design by slowing the rate at which ideas are evaluated. This paper presents an examination of existing languages to reveal their fundamental limitations regarding reuse in hardware modeling. With this understanding, a solution is described in the context of the design and implementation of the Liberty Structural Specification language (LSS), the input language for a publicly available high-level digital-hardware modeling tool called the Liberty Simulation Environment. LSS is the first language to enable low-overhead reuse by simultaneously supporting static inference based on hardware structure and flexibility via parameterizable structure. Through LSS, this paper also introduces a new type inference algorithm and a new programming language technique, called use-based specialization, which, in a manner analogous to type inference, customizes reusable components by statically inferring structural properties that otherwise would have had to have been specified manually.

关键词： Computer programming languages

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Mostly-Automated Verification of Low-Level Programs in Computational Separation Logic 11

Mostly-Automated Verification of Low-Level Programs in Compu...

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32nd acm sigplan conference on programming language design and implementation (pldi 11)

作者： Chlipala, Adam Harvard Univ Cambridge MA 02138 USA

ISBN: (纸本)9781450306638

Several recent projects have shown the feasibility of verifying low-level systems software. Verifications based on automated theorem-proving have omitted reasoning about first-class code pointers, which is critical for tasks like certifying implementations of threads and processes. Conversely, verifications that deal with first-class code pointers have featured long, complex, manual proofs. In this paper, we introduce the Bedrock framework, which supports mostly-automated proofs about programs with the full range of features needed to implement, e.g., language runtime systems. The heart of our approach is in mostly-automated discharge of verification conditions inspired by separation logic. Our take on separation logic is computational, in the sense that function specifications are usually written in terms of reference implementations in a purely functional language. Logical quantifiers are the most challenging feature for most automated verifiers;by relying on functional programs (written in the expressive language of the Coq proof assistant), we are able to avoid quantifiers almost entirely. This leads to some dramatic improvements compared to both past work in classical verification, which we compare against with implementations of data structures like binary search trees and hash tables;and past work in verified programming with code pointers, which we compare against with examples like function memoization and a cooperative threading library.

关键词： interactive proof assistants separation logic low-level programming languages functional programming

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Gillian, Part I: A Multi-language Platform for Symbolic Execution 2020

Gillian, Part I: A Multi-language Platform for Symbolic Exec...

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41st acm sigplan conference on programming language design and implementation (pldi)

作者： Santos, Jose Fragoso Maksimovic, Petar Ayoun, Sacha-Elie Gardner, Philippa Univ Lisbon INESC ID Inst Super Tecn Lisbon Portugal Imperial Coll London London England

ISBN: (纸本)9781450376136

We introduce Gillian, a platform for developing symbolic analysis tools for programming languages. Here, we focus on the symbolic execution engine at the heart of Gillian, which is parametric on the memory model of the target language. We give a formal description of the symbolic analysis and a modular implementation that closely follows this description. We prove a parametric soundness result, introducing restriction on abstract states, which generalises path conditions used in classical symbolic execution. We instantiate Gillian to obtain trusted symbolic testing tools for JavaScript and C, and use these tools to find bugs in real-world code, thus demonstrating the viability of our parametric approach.

关键词： Symbolic execution parametric semantics bug-finding bounded verification JavaScript C

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Heartbeat Scheduling: Provable Efficiency for Nested Parallelism 2018

Heartbeat Scheduling: Provable Efficiency for Nested Paralle...

引用

39th acm sigplan conference on programming language design and implementation (pldi)

作者： Acar, Umut A. Chargueraud, Arthur Guatto, Adrien Rainey, Mike Sieczkowski, Filip Carnegie Mellon Univ Pittsburgh PA 15213 USA INRIA Rocquencourt France Univ Strasbourg ICube Strasbourg France CREST Bloomington IN USA

ISBN: (纸本)9781450356985

A classic problem in parallel computing is to take a high-level parallel program written, for example, in nested-parallel style with fork-join constructs and run it efficiently on a real machine. The problem could be considered solved in theory, but not in practice, because the overheads of creating and managing parallel threads can overwhelm their benefits. Developing efficient parallel codes therefore usually requires extensive tuning and optimizations to reduce parallelism just to a point where the overheads become acceptable. In this paper, we present a scheduling technique that delivers provably efficient results for arbitrary nested-parallel programs, without the tuning needed for controlling parallelism overheads. The basic idea behind our technique is to create threads only at a beat (which we refer to as the "heartbeat") and make sure to do useful work in between. We specify our heartbeat scheduler using an abstract-machine semantics and provide mechanized proofs that the scheduler guarantees low overheads for all nested parallel programs. We present a prototype C++ implementation and an evaluation that shows that Heartbeat competes well with manually optimized Cilk Plus codes, without requiring manual tuning.

关键词： parallel programming languages granularity control

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Thread-modular shape analysis 07

Thread-modular shape analysis

引用

conference on programming language design and implementation

作者： Gotsman, Alexey Berdine, Josh Cook, Byron Sagiv, Mooly Univ Cambridge Cambridge CB2 1TN England Microsoft Corp Redmond WA 98052 USA

ISBN: (纸本)9781595936332

We present the first shape analysis for multithreaded programs that avoids the explicit enumeration of execution-interleavings. Our approach is to automatically infer a resource invariant associated with each lock that describes the part of the heap protected by the lock. This allows us to use a sequential shape analysis on each thread. We show that resource invariants of a certain class can be characterized as least fixed points and computed via repeated applications of shape analysis only on each individual thread. Based on this approach, we have implemented a thread-modular shape analysis tool and applied it to concurrent heap-manipulating code from Windows device drivers.

关键词： abstract interpretation concurrent programming shape analysis static analysis

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Shangri-La: Achieving high performance from compiled network applications while enabling ease of programming

Shangri-La: Achieving high performance from compiled network...

引用

2005 acm sigplan conference on programming language design and implementation, pldi 05

作者： Chen, Michael K. Li, Xiao Feng Lian, Ruiqi Lin, Jason H. Liu, Lixia Liu, Tao Ju, Roy Microprocessor Technology Labs. Intel Corporation Santa Clara CA United States Intel China Research Center Ltd. Beijing China Institute of Computing Technology China Academy of Sciences Beijing China

programming network processors is challenging. To sustain high line rates, network processors have extremely tight memory access and instruction budgets. Achieving desired performance has traditionally required hand-coded assembly. Researchers have recently proposed high-level programming languages for packet processing, but the challenges of compiling these languages into code that is competitive with hand-tuned assembly remain unanswered. This paper describes the Shangri-La compiler, which accepts a packet program written in a C-like high-level language and applies scalar and specialized optimizations to generate a highly optimized binary. Hot code paths identified by profiling are mapped across processing elements to maximize processor utilization. Since our compilation target has no hardware caches, software-controlled caches are generated for frequently accessed application data structures. Packet handling optimizations significantly reduce perpacket memory access and instruction counts. Finally, a custom stack model maps stack frames to the fastest levels of the target processor's heterogeneous memory hierarchy. Binaries generated by the compiler were evaluated on the Intel 1XP2400 network processor with eight packet processing cores and eight threads per core. Our results show the importance of both traditional and specialized optimization techniques for achieving the maximum forwarding rates on three network applications, L3-Switch, MPLS and Firewall. Copyright 2005 acm.

关键词： Program processors

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Static array storage optimization in MATLAB 03

引用

conference on programming language design and implementation

作者： Joisha, PG Banerjee, P Northwestern Univ ECE Dept Evanston IL 60208 USA

ISBN: (纸本)9781581136623

An adaptation of the classic register allocation algorithm to the problem of array storage optimization in MATLAB is presented. The method involves the decomposition of an interference graph's color classes using inferred type information. A key trait is the use of symbolic types, along with control flow, in performing the decomposition. On a benchmark suite spanning the published test suites of some recent research MATLAB compilers, our implementation produces savings in the average virtual memory size, with respect to code generated by a commercial MATLAB compiler, of between 51% and 139% in 6 out of 11 programs, and savings between 0.7% and 47% in the remaining. In absolute terms, this ranged from 123KB to over 9MB. Substantial improvements in other categories of memory, such as resident sets and dynamic data (stack plus heap), were also observed and are reported. Speedups in execution times of at least over an order of magnitude in 4 programs, of over 100% in 4 of the remaining, and 10% and over in-the rest are also reported.

关键词： algorithms design languages performance

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