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Sökning: db:Swepub > Persson Anders > Konferensbidrag > (2010-2011)

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1.
  • Axelsson, Emil, 1978-, et al. (författare)
  • Feldspar: A Domain Specific Language for Digital Signal Processing algorithms
  • 2010
  • Ingår i: Eighth ACM/IEEE International Conference on Formal Methods and Models for Codesign. - 978-142447885-9 ; s. 169-178
  • Konferensbidrag (refereegranskat)abstract
    • A new language, Feldspar, is presented, enabling high-level and platform-independent description of digital signal processing (DSP) algorithms. Feldspar is a pure functional language embedded in Haskell. It offers a high-level dataflow style of programming, as well as a more mathematical style based on vector indices. The key to generating efficient code from such descriptions is a high-level optimization technique called vector fusion. Feldspar is based on a low-level, functional core language which has a relatively small semantic gap to machine-oriented languages like C. The core language serves as the interface to the back-end code generator, which produces C. For very small examples, the generated code performs comparably to hand-written C code when run on a DSP target. While initial results are promising, to achieve good performance on larger examples, issues related to memory access patterns and array copying will have to be addressed.
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2.
  • Axelsson, Emil, 1978-, et al. (författare)
  • The Design and Implementation of Feldspar: an Embedded Language for Digital Signal Processing
  • 2010
  • Ingår i: IFL 2010, the 22nd Symposium on Implementation and Application of Functional Languages.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Feldspar is a Domain Specific Language, embedded in Haskell, for programming Digital Signal Processing algorithms. The final aim of a Feldspar program is to generate low level code with good performance. Still, we chose to provide the user with a purely functional DSL. The language is implemented as a minimal, deeply embedded core language, with shallow extensions built upon it. This paper presents full details of the essential parts of the implementation. Our initial conclusion is that this approach works well in our domain, although much work remains.
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3.
  • Axelsson, Emil, 1978-, et al. (författare)
  • The Design and Implementation of Feldspar: An Embedded Language for Digital Signal Processing
  • 2011
  • Ingår i: Lecture Notes in Computer Science, Implementation and Application of Functional Languages. - 03029743. - 978-3-642-24275-5 ; 6647, s. 121-136
  • Konferensbidrag (refereegranskat)abstract
    • Feldspar is a domain specific language, embedded in Haskell, for programming digital signal processing algorithms. The final aim of a Feldspar program is to generate low level code with good performance. Still, we chose to provide the user with a purely functional DSL. The language is implemented as a minimal, deeply embedded core language, with shallow extensions built upon it. This paper presents full details of the essential parts of the implementation. Our initial conclusion is that this approach works well in our domain, although much work remains.
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4.
  • Batani, D., et al. (författare)
  • Effects of laser prepulse on proton generation
  • 2010
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - Elsevier. - 0168-9002. ; 620:1, s. 76-82
  • Konferensbidrag (refereegranskat)abstract
    • Low-intensity laser prepulse ( < 10(13) W/cm(2), ns duration) are a major issue in experiments on laser-generation of protons, often limiting the performances of proton sources produced by high-intensity lasers (approximate to 10(19) W/cm(2), ps or fs duration) Several effects are associated to the prepulse and are discussed in this contribution: i) Destruction of thin foil targets by the shock generated by the laser prepulse ii) Creation of preplasma on target front side affecting laser absorption iii) Deformation of target rear side iv) Whole displacement of thin foil targets affecting focusing condition In particular, we show that under oblique high-intensity irradiation and for low prepulse intensities, the proton beam is directed away from the target normal. Deviation is towards the laser forward direction, with an angle that increases with the level and duration of the ASE pedestal. Also, for a given laser pulse, beam deviation increases with proton energy. The observations are discussed in terms of Target Normal Sheath Acceleration, in combination with a laser-controllable shock wave locally deforming the target surface. (C) 2010 Elsevier B.V. All rights reserved.
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5.
  • Batani, D., et al. (författare)
  • Effects of laser prepulse on proton generation
  • 2010
  • Ingår i: Radiation Effects and Defects in Solids. - Taylor & Francis. - 1042-0150. ; 165:6-10, s. 794-802
  • Konferensbidrag (refereegranskat)abstract
    • Prepulse is a major issue for laser generation of protons, often limiting the performances of laser sources. Here, we show the use of prepulse (1013W/cm2, ns duration) to actively manipulate the proton beam direction. Under oblique high-intensity irradiation (approximate to 1019W/cm2, ps duration) of the thin foil target, and for low prepulse intensities, the proton beam is directed away from the ounperturbedo target normal. Observations are discussed in terms of target normal sheath acceleration, in combination with a laser-controllable shock locally deforming the target surface.
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8.
  • Dévai, Gergely, et al. (författare)
  • Efficient Code Generation from the High-level Domain-specific Language Feldspar for DSPs
  • 2010
  • Ingår i: ODES-8: 8th Workshop on Optimizations for DSP and Embedded Systems, workshop associated with IEEE/ACM International Symposium on Code Generation and Optimization (CGO).
  • Konferensbidrag (refereegranskat)abstract
    • Software for digital signal processors (DSPs) is traditionally highly hardware-dependent and hence porting it to new processors usually requires significant design effort. In this paper we present Feldspar (Functional Embedded Language for DSP and Parallelism), an embedded, high-level, domain-specific language for DSP algorithm design and the compilation techniques we developed for generating C code from specifications written in Feldspar. While Feldspar allows description of algorithms on specification level, we show that with the right set of abstractions and transformations this high level, functional specification can be transformed into C code that is comparable or better than reference, hand-crafted C language implementations. The Feldspar compiler is highly modular and plugin-based, hence future hardware-specific plugins will enable automatic generation of efficient, hardware-specific code. This approach enables the encapsulation of knowledge of hardware completely in the compiler and thus allows description of algorithms in completely hardware-independent, portable manner.
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