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5b77ac32b1
After much refactoring over the last 2 weeks to the reduction matching code, I think this change is finally ready. We effectively broke fmax/fmin vector reduction optimization when we started canonicalizing to intrinsics in instcombine, so this should restore that functionality for SLP. There are still FMF problems here as noted in the code comments, but we should be avoiding miscompiles on those for fmax/fmin by restricting to full 'fast' ops (negative tests are included). Fixing FMF propagation is a planned follow-up. Differential Revision: https://reviews.llvm.org/D94913 |
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