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Fix inliner funclet unwind memoization #66
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Summary: The inliner may need to determine where a given funclet unwinds to, and this determination may depend on other funclets throughout the funclet tree. The code that performs this walk in getUnwindDestToken memoizes results to avoid redundant computations. In the case that a funclet's unwind destination is derived from its ancestor, there's code to walk back down the tree from the ancestor updating the memo map of its descendants to record the unwind destination. This change fixes that code to account for the case that some descendant has a different unwind destination, which can happen if that unwind dest is a descendant of the EHPad being queried and thus didn't determine its unwind destination. Also update test inline-funclets.ll, which is supposed to cover such scenarios, to include a case that fails an assertion without this fix but passes with it. Fixes PR29151. Reviewers: majnemer Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D24117 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280610 91177308-0d34-0410-b5e6-96231b3b80d8
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Fixes an MSVC optimization bug (https://bugs.llvm.org//show_bug.cgi?id=29151), which is exposed by the shimmir patch.