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检索条件"任意字段=Proceedings of the ACM Sigplan 2003 Conference on Programming Language Design and Implementation"

共 1287 条记录，以下是341-350 订阅

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Towards an API for the Real Numbers 2020

Towards an API for the Real Numbers

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

作者： Boehm, Hans-J Google Mountain View CA 94043 USA

ISBN: (纸本)9781450376136

The real numbers are pervasive, both in daily life, and in mathematics. Students spend much time studying their properties. Yet computers and programming languages generally provide only an approximation geared towards performance, at the expense of many of the nice properties we were taught in high school. Although this is entirely appropriate for many applications, particularly those that are sensitive to arithmetic performance in the usual sense, we argue that there are others where it is a poor choice. If arithmetic computations and result are directly exposed to human users who are not floating point experts, floating point approximations tend to be viewed as bugs. For applications such as calculators, spreadsheets, and various verification tasks, the cost of precision sacrifices is high, and the performance benefit is often not critical. We argue that previous attempts to provide accurate and understandable results for such applications using the recursive reals were great steps in the right direction, but they do not suffice. Comparing recursive reals diverges if they are equal. In many cases, comparison of numbers, including equal ones, is both important, particularly in simple cases, and intractable in the general case. We propose an API for a real number type that explicitly provides decidable equality in the easy common cases, in which it is often unnatural not to. We describe a surprisingly compact and simple implementation in detail. The approach relies heavily on classical number theory results. We demonstrate the utility of such a facility in two applications: testing floating point functions, and to implement arithmetic in Google's Android calculator application.

关键词： real numbers API design comparison decidability

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Reticle: A Virtual Machine for programming Modern FPGAs 2021

Reticle: A Virtual Machine for Programming Modern FPGAs

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

作者： Vega, Luis McMahan, Joseph Sampson, Adrian Grossman, Dan Ceze, Luis Univ Washington Seattle WA 98195 USA Cornell Univ Ithaca NY 14853 USA

ISBN: (纸本)9781450383912

Modern field-programmable gate arrays (FPGAs) have recently powered high-profile efficiency gains in systems from datacenters to embedded devices by offering ensembles of heterogeneous, reconfigurable hardware units. programming stacks for FPGAs, however, are stuck in the past-they are based on traditional hardware languages, which were appropriate when FPGAs were simple, homogeneous fabrics of basic programmable primitives. We describe Reticle, a new low-level abstraction for FPGA programming that, unlike existing languages, explicitly represents the special-purpose units available on a particular FPGA device. Reticle has two levels: a portable intermediate language and a target-specific assembly language. We show how to use a standard instruction selection approach to lower intermediate programs to assembly programs, which can be both faster and more effective than the complex metaheuristics that existing FPGA toolchains use. We use Reticle to implement linear algebra operators and coroutines and find that Reticle compilation runs up to 100 times faster than current approaches while producing comparable or better run-time and utilization.

关键词： compilers FPGAs

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Teapot: language support for writing memory coherence protocols

Teapot: language support for writing memory coherence protoc...

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proceedings of the acm sigplan'96 conference on programming language design and implementation, PLDI

作者： Chandra, Satish Richards, Brad Larus, James R. Univ of Wisconsin-Madison Madison United States

Recent shared-memory parallel computer systems offer the exciting possibility of customizing memory coherence protocols to fit an application's semantics and sharing patterns. Custom protocols have been used to achieve message-passing performance - while retaining the convenient programming model of a global address space - and to implement high-level language constructs. Unfortunately, coherence protocols written in a conventional language such as C are difficult to write, debug, understand, or modify. This paper describes Teapot, a small, domain-specific language for writing coherence protocols. Teapot uses continuations to help reduce the complexity of writing protocols. Simple static analysis in the Teapot compiler eliminates much of the overhead of continuations and results in protocols that run nearly as fast as hand-written C code. A Teapot specification can be compiled both to an executable coherence protocol and to input for a model checking system, which permits the specification to be verified. We report our experiences coding and verifying several protocols written in Teapot, along with measurements of the overhead incurred by writing a protocol in a higher-level language.

关键词： Computer hardware description languages

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A system and language for building system-specific, static analyses 02

A system and language for building system-specific, static a...

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conference on programming language design and implementation (PLDI 02)

作者： Hallem, S Chelf, B Xie, YC Engler, D Stanford Univ Stanford CA 94305 USA

ISBN: (纸本)9781581134636

This paper presents a novel approach to bug-finding analysis and an implementation of that approach. Our goal is to find as many serious bugs as possible. To do so, we designed a flexible, easy-to-use extension language for specifying analyses and an efficient algorithm for executing these extensions. The language, metal, allows the users of our system to specify a broad class of analyses in terms that resemble the intuitive description of the rules that they check. The system, xgcc, executes these analyses efficiently using a context-sensitive, interprocedural analysis. Our prior work has shown that the approach described in this paper is effective: it has successfully found thousands of bugs in real systems code. This paper describes the underlying system used to achieve these results. We believe that our system is an effective framework for deploying new bug-finding analyses quickly and easily.

关键词： extensible compilation error detection reliability security verification

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Distributed REScala: An Update Algorithm for Distributed Reactive programming 14

Distributed REScala: An Update Algorithm for Distributed Rea...

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2014 acm International conference on Object-Oriented-programming-Systems-languages-and-Applications (OOPSLA 14)

作者： Drechsler, Joscha Salvaneschi, Guido Mogk, Ragnar Mezini, Mira Tech Univ Darmstadt Darmstadt Germany Univ Lancaster Lancaster LA1 4YW England

ISBN: (纸本)9781450325851

Reactive programming improves the design of reactive applications by relocating the logic for managing dependencies between dependent values away from the application logic to the language implementation. Many distributed applications are reactive. Yet, existing change propagation algorithms are not suitable in a distributed setting. We propose Distributed REScala, a reactive language with a change propagation algorithm that works without centralized knowledge about the topology of the dependency structure among reactive values and avoids unnecessary propagation of changes, while retaining safety guarantees (glitch freedom). Distributed REScala enables distributed reactive programming, bringing the benefits of reactive programming to distributed applications. We demonstrate the enabled design improvements by a case study. We also empirically evaluate the performance of our algorithm in comparison to other algorithms in a simulated distributed setting.

关键词： Reactive programming Scala Distributed programming

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Multi-modal Synthesis of Regular Expressions 2020

Multi-modal Synthesis of Regular Expressions

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

作者： Chen, Qiaochu Wang, Xinyu Ye, Xi Durrett, Greg Dillig, Isil Univ Texas Austin Austin TX 78712 USA Univ Michigan Ann Arbor MI 48109 USA

ISBN: (纸本)9781450376136

In this paper, we propose a multi-modal synthesis technique for automatically constructing regular expressions (regexes) from a combination of examples and natural language. Using multiple modalities is useful in this context because natural language alone is often highly ambiguous, whereas examples in isolation are often not sufficient for conveying user intent. Our proposed technique first parses the English description into a so-called hierarchical sketch that guides our programming-by-example (PBE) engine. Since the hierarchical sketch captures crucial hints, the PBE engine can leverage this information to both prioritize the search as well as make useful deductions for pruning the search space. We have implemented the proposed technique in a tool called Regel and evaluate it on over three hundred regexes. Our evaluation shows that Regel achieves 80% accuracy whereas the NLP-only and PBE-only baselines achieve 43% and 26% respectively. We also compare our proposed PBE engine against an adaptation of AlphaRegex, a state-of-the-art regex synthesis tool, and show that our proposed PBE engine is an order of magnitude faster, even if we adapt the search algorithm of AlphaRegex to leverage the sketch. Finally, we conduct a user study involving 20 participants and show that users are twice as likely to successfully come up with the desired regex using Regel compared to without it.

关键词： Program Synthesis programming by Natural languages programming by Example Regular Expression

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Speculative Separation for Privatization and Reductions 12

Speculative Separation for Privatization and Reductions

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33rd acm sigplan conference on programming language design and implementation

作者： Johnson, Nick P. Kim, Hanjun Prabhu, Prakash Zaks, Ayal August, David I. Princeton Univ Princeton NJ 08544 USA Intel Corp Haifa Israel

ISBN: (纸本)9781450312059

Automatic parallelization is a promising strategy to improve application performance in the multicore era. However, common programming practices such as the reuse of data structures introduce artificial constraints that obstruct automatic parallelization. Privatization relieves these constraints by replicating data structures, thus enabling scalable parallelization. Prior privatization schemes are limited to arrays and scalar variables because they are sensitive to the layout of dynamic data structures. This work presents Privateer, the first fully automatic privatization system to handle dynamic and recursive data structures, even in languages with unrestricted pointers. To reduce sensitivity to memory layout, Privateer speculatively separates memory objects. Privateer's lightweight runtime system validates speculative separation and speculative privatization to ensure correct parallel execution. Privateer enables automatic parallelization of general-purpose C/C++ applications, yielding a geomean whole-program speedup of 11.4x over best sequential execution on 24 cores, while non-speculative parallelization yields only 0.93x.

关键词： languages Performance design Experimentation Automatic parallelization Separation Speculation

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A Play on Regular Expressions Functional Pearl 10

A Play on Regular Expressions Functional Pearl

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15th acm sigplan International conference on Functional programming

作者： Fischer, Sebastian Huch, Frank Wilke, Thomas Univ Kiel D-24098 Kiel Germany

ISBN: (纸本)9781605587943

Cody, Hazel, and Theo, two experienced Haskell programmers and an expert in automata theory, develop an elegant Haskell program for matching regular expressions: (i) the program is purely functional;(ii) it is overloaded over arbitrary semirings, which not only allows to solve the ordinary matching problem but also supports other applications like computing leftmost longest matchings or the number of matchings, all with a single algorithm;(iii) it is more powerful than other matchers, as it can be used for parsing every context-free language by taking advantage of laziness. The developed program is based on an old technique to turn regular expressions into finite automata which makes it efficient both in terms of worst-case time and space bounds and actual performance: despite its simplicity, the Haskell implementation can compete with a recently published professional C++ program for the same problem.

关键词： Algorithms design regular expressions finite automata Glushkov construction purely functional programming

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programming with Binders and Indexed Data-Types 12

Programming with Binders and Indexed Data-Types

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39th Annual acm sigplan-SIGACT Symposium on Principles of programming languages

作者： Cave, Andrew Pientka, Brigitte McGill Univ Montreal PQ H3A 2T5 Canada

ISBN: (纸本)9781450310833

We show how to combine a general purpose type system for an existing language with support for programming with binders and contexts by refining the type system of ML with a restricted form of dependent types where index objects are drawn from contextual LF. This allows the user to specify formal systems within the logical framework LF and index ML types with contextual LF objects. Our language design keeps the index language generic only requiring decidability of equality of the index language providing a modular design. To illustrate the elegance and effectiveness of our language, we give programs for closure conversion and normalization by evaluation. Our three key technical contribution are: 1) We give a bidirectional type system for our core language which is centered around refinement substitutions instead of constraint solving. As a consequence, type checking is decidable and easy to trust, although constraint solving may be undecidable. 2) We give a big-step environment based operational semantics with environments which lends itself to efficient implementation. 3) We prove our language to be type safe and have mechanized our theoretical development in the proof assistant Coq using the fresh approach to binding.

关键词： Logical frameworks higher-order abstract syntax dependent types recursive types

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Automatically closing open reactive programs

Automatically closing open reactive programs

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Colby, Christopher Godefroid, Patrice Jagadeesan, Lalita Jategaonkar Loyola Univ Chicago Chicago United States

We study in this paper the problem of analyzing implementations of open systems - systems in which only some of the components are present. We present an algorithm for automatically dosing an open concurrent reactive system with its most general environment, i.e., the environment that can provide any input at any time to the system. The result is a nondeterministic closed (i.e., self-executable) system which can exhibit all the possible reactive behaviors of the original open system. These behaviors can then be analyzed using VeriSoft, an existing tool for systematically exploring the state spaces of closed systems composed of multiple (possibly nondeterministic) processes executing arbitrary code. We have implemented the techniques introduced in this paper in a prototype tool for automatically closing open programs written in the C programming language. We discuss preliminary experimental results obtained with a large telephone-switching software application developed at Lucent Technologies.

关键词： Computer systems programming

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