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Even if I turn to -O0 [in other words, no optimisation passes at all], it takes the same amount of time. The time is spent in 12.94% lacsap lacsap [.] llvm::SDNode::use_iterator::operator== 7.68% lacsap lacsap [.] llvm::SDNode::use_iterator::operator* 7.53% lacsap lacsap [.] llvm::SelectionDAG::ReplaceAllUsesOfValueWith 7.28% lacsap

I've definitely "run into this problem", and I would very much love to remove my kludges [that are incomplete, because I keep finding places where I need to modify the code-gen to "fix" the same problem - this is probably par for the course from a complete amateur compiler writer and someone that has only spent the last 14 months working (as a hobby) with LLVM]. So whilst