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* Fixed a reduction bug which occasionally led to infinite-cost (invalid)
register allocation solutions despite the existence finite-cost solutions.
* Significantly reduced memory usage (>50% reduction).
* Simplified a lot of the solver code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94514 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92830 91177308-0d34-0410-b5e6-96231b3b80d8
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stuff as it was only meant for debugging the solver.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78359 91177308-0d34-0410-b5e6-96231b3b80d8
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based solver, but I'll be working to improve that. The PBQP allocator has been updated to use the new solver.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78354 91177308-0d34-0410-b5e6-96231b3b80d8
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