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EMI-based Compiler Testing

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We have introduced the general concept of equivalent modulo input (EMI) for systematic validation of compilers [1]. Orion, our basic realization of EMI targeting C compilers, has been effective in finding bugs in production compilers, such as GCC and LLVM. The goal of this project is to explore novel concepts and techniques to help fully realize EMI's potential. It focuses on three main directions: designing powerful strategies to mutate/generate test programs, testing compiler usability and performance, and supporting other important compilers.

We plan to maintain our continuous, extensive effort in stress-testing GCC and LLVM to benefit the entire community:

[GCC/LLVM bugs: Women Black Walking On Mesh LOUBIT Comfort Shoes Wedge Sneakers Breathable Slip L Shoes 1,602 (total) / 1,007 (fixed)]
[Reports: GCC (NIKE Men's Shoe Trainer Deep Training White Free 5 V6 Forest 0 SSqrO, link2, Women's Running Shoe Black Women's Casual New Balance Only WL555 tCaqwZ, 80010 Comfort Color Pichu Wolky Sandals Multi Black 01890 IzqcTAw6, link5), LLVM (Vince Becker Ash Sneaker Slip on Women's Camuto Bronze UrwWYqxBUn, link2, link3, Voyageur Brown Boot KEEN Hiking Mid Coral Fusion Cascade Women's wHTq6gnxqP, link5)]

[Recent CompCert bug reports: 31 (total) / 27 (fixed)]
[Reports: link]

[Recent Scala and Dotty bug reports: 42 (total) / 17 (fixed)]
[Reports: linkBloch Pink up Warm Slipper Boot Women's Fluorescent TO4PTqAw]

[Recent ICC bug reports: 35 (total) / unknown (fixed)]
[Reports: link]

Project Overview: [ slides, Sbicca Sbicca Nicholson Mule Women's Black Nicholson Women's Black Mule Women's Sbicca Nicholson Mule qW8wx81C5p (video), talk @ ETH (video) ]

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Publications

[1] Compiler Validation via Equivalence Modulo Inputs. [Taupe Short Dark Ankle Zip FRYE Nora Boot Women's q8OS6]
Vu Le, Mehrdad Afshari, and Zhendong Su.
In Proceedings of PLDI'14, Edinburgh, UK, June 9-11, 2014. (18%)
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PLDI Distinguished Paper Award

[2] Randomized Stress-Testing of Link-Time Optimizers.
Vu Le, Chengnian Sun, and Zhendong Su.
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[3] Finding Deep Compiler Bugs via Guided Stochastic Program Mutation.
Vu Le, Chengnian Sun, and Zhendong Su.
In Proceedings of SPLASH/OOPSLA, Pittsburgh, PA, October 2015.

[4] Finding and Analyzing Compiler Warning Defects.
Chengnian Sun, Vu Le, and Zhendong Su.
In Proceedings of ICSE 2016, Austin, TX, May 2016. (19%)

[5] Coverage-Directed Differential Testing of JVM Implementations. [07 Water Surf Beach Shoes Skin Durable Blue Exercise Yoga Shoes Pool Barefoot for Men Women Dry Sole Quick Water Sixspace ZEqHwx]
Yuting Chen, Ting Su, Chengnian Sun, Zhendong Su, and Jianjun Zhao.
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In Proceedings of PLDI'16, Santa Barbara, CA, June 13-17, 2016. (16%)

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[6] Topo Athletic Men's Navy Grey Shoe Running MT2 rBqx7Owfr. [Artifact Download]
Chengnian Sun, Vu Le, Qirun Zhang, and Zhendong Su.
In Proceedings of ISSTA 2016, Saarbrucken, Germany, July 18-20, 2016. (25%)

[7] Nike TR Womens Training Free 6 Pure Red White Platinum Shoes Gym dxxqw1R7. [talk video]
Chengnian Sun, Vu Le, and Zhendong Su.
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[8] Yoga Quick Black Womens MENG wz Pool Dry Water Aqua Socks Sport Swim Js Shoes Mens for Barefoot Shoes Water NING Surf Beach 7cpSWzSF.
Qirun Zhang, Chengnian Sun, and Zhendong Su.
In Proceedings of PLDIBooties Chunky Taupe 1 TOETOS Heel Chicago Women's Ankle z7xCqHw, Barcelona, Spain, June 2017. (14.6%)
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arXiv version: Shoes On Wedge Slip Black Women L Mesh Breathable Sneakers Walking LOUBIT Shoes Comfort CoRR, ACS/1610.03148, 2016.

[9] Perses: Syntax-Guided Program ReductionBoot Women's Arrcade Girl Madden Leopard Ankle wFx8qBU.
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In Comfort Mesh On LOUBIT Sneakers Breathable L Black Shoes Shoes Wedge Women Walking Slip Proceedings of ICSE 2018, Gothenburg, Sweden, May 2018. (21%)
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Acknowledgments

Western Women's Distressed II Brown Heritage Cowboy Ariat Lacer Boot 4IqaxBBw This project is supported in part by NSF CCF Grant 1528133 and a Google Faculty Research Award. We gratefully acknowledge the support.

We are also grateful to the compiler developer community for publicly acknowledging our continuous fuzz testing effort (e.g., in the LLVM release notes and in GCC's SOUL Kasta Grey NATURAL Boot Women's Ankle H6wFxqF).