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  1. ; ; (, Proceedings of the ACM on Programming Languages)
    A superoptimizing compiler—-one that performs a meaningful search of the program space as part of the optimization process—-can find optimization opportunities that are missed by even the best existing optimizing compilers. We created Minotaur: a superoptimizer for LLVM that uses program synthesis to improve its code generation, focusing on integer and floating-point SIMD code. On an Intel Cascade Lake processor, Minotaur achieves an average speedup of 7.3% on the GNU Multiple Precision library (GMP)’s benchmark suite, with a maximum speedup of 13%. On SPEC CPU 2017, our superoptimizer produces an average speedup of 1.5%, with a maximum speedup of 4.5% for 638.imagick. Every optimization produced by Minotaur has been formally verified, and several optimizations that it has discovered have been implemented in LLVM as a result of our work. 
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