NDLI: Free Rider: A Tool for Retargeting Platform-Specific Intrinsic Functions

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Free Rider: A Tool for Retargeting Platform-Specific Intrinsic Functions

Content Provider	ACM Digital Library
Author	Manilov, Stanislav Andrieu, Cedric Franke, Björn Magrath, Anthony
Abstract	Short-vector SIMD and DSP instructions are popular extensions to common Isas. These extensions deliver excellent performance and compact code for some compute-intensive applications, but they require specialised compiler support. To enable the programmer to explicitly request the use of such an instruction, many C compilers provide platform-specific intrinsic functions, whose implementation is handled specially by the compiler. The use of such intrinsics, however, inevitably results in non-portable code. In this paper we develop a novel methodology for retargeting such non-portable code, which maps intrinsics from one platform to another, taking advantage of similar intrinsics on the target platform. We employ a description language to specify the signature and semantics of intrinsics and perform graph-based pattern matching and high-level code transformations to derive optimised implementations exploiting the target's intrinsics, wherever possible. We demonstrate the effectiveness of our new methodology, implemented in the FREE RIDER tool, by automatically retargeting benchmarks derived from OpenCV samples and a complex embedded application optimised to run on an Arm Cortex-M4 to an Intel Edison module with Sse4.2 instructions. We achieve a speedup of up to 3.73 over a plain C baseline, and on average 96.0% of the speedup of manually ported and optimised versions of the benchmarks.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781450332576
DOI	10.1145/2670529.2754962
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-06-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Retargeting Compiler-known functions Intrinsics Graph pattern matching
Content Type	Text
Resource Type	Article

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