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Re:Souper – A Superoptimizer for LLVM IR by fulafel on Wednesday October 28, 2015 @08:02AM (#10463907)
This has been done in '87 by Massalin: https://www.cs.arizona.edu/~collberg/Teaching/553/2011/Resou...

(both are brute force though, not solver-based)

Re:Souper – A Superoptimizer for LLVM IR by cwzwarich on Wednesday October 28, 2015 @08:16AM (#10463960)
Massalin's superoptimizer required humans to check the correctness of optimizations. It also didn't generate parameterized peephole optimizations; it directly optimized concrete instruction sequences.