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Summary: Check to make sure that the caller and the callee have compatible function arguments before promoting arguments. This uses the same TargetTransformInfo queries that are used to determine if attributes are compatible for inlining. The goal here is to avoid breaking ABI when a called function's ABI depends on a target feature that is not enabled in the caller. This is a very conservative fix for PR37358. Ideally we would have a more sophisticated check for ABI compatiblity rather than checking if the attributes are compatible for inlining. Reviewers: echristo, chandlerc, eli.friedman, craig.topper Reviewed By: echristo, chandlerc Subscribers: nikic, xbolva00, rkruppe, alexcrichton, llvm-commits Differential Revision: https://reviews.llvm.org/D53554 llvm-svn: 351296
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