Extending the C/C++ Memory Model with Inline Assembly

Programs written in C/C++ often include inline assembly: a snippet of architecture-specific assembly code used to access low-level functionalities that are impossible or expensive to simulate in the source language. Although inline assembly is widely used, its semantics has not yet been formally stu...

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Veröffentlicht in:Proceedings of ACM on programming languages Jg. 8; H. OOPSLA2; S. 1081 - 1107
Hauptverfasser: de Vilhena, Paulo Emílio, Lahav, Ori, Vafeiadis, Viktor, Raad, Azalea
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY, USA ACM 08.10.2024
Schlagworte:
Architectures
Computer systems organization
Concurrency
Formal language definitions
Semantics and reasoning
Software and its engineering
Theory of computation
Concurrency
Weak Memory Models
Semantics of Programming Languages
ISSN:2475-1421, 2475-1421
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Zusammenfassung:Programs written in C/C++ often include inline assembly: a snippet of architecture-specific assembly code used to access low-level functionalities that are impossible or expensive to simulate in the source language. Although inline assembly is widely used, its semantics has not yet been formally studied. In this paper, we overcome this deficiency by investigating the effect of inline assembly on the consistency semantics of C/C++ programs. We propose the first memory model of the C++ Programming Language with support for inline assembly for Intel's x86 including non-temporal stores and store fences. We argue that previous provably correct compiler optimizations and correct compiler mappings should remain correct under such an extended model and we prove that this requirement is met by our proposed model.
ISSN:2475-1421
2475-1421
DOI:10.1145/3689749