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(Moving this discussion on list as this could be of general interest.) My current work-in-progress implementation is attempting to map out the blocks used by a landing pad before it starts outlining. It creates a table of catch and cleanup handlers with the block at which each one starts. During outlining I intend to have another mechanism to check to see if we’ve already outlined the handler

...39;ll have a phi-dependent branch that's really easy to analyze. It'd be good if the preparation pass could understand this much, and no more. :) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150213/474cdfe2/attachment.html>