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Efficient Calling Conventions for Irregular Architectures

12/02/2021

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by Philipp K. Krause, et al.

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We empirically evaluated thousands of different C calling conventions for irregular microcontroller architectures, and found potential for improvement over the calling conventions previously used in the Small Device C Compiler (SDCC). The improvements in code size and speed are substantial enough that SDCC made changes to its default calling convention, breaking ABI compatibility.

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