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Summary: This patch extends the current capabilities in loop fusion to fuse guarded loops (as defined in https://reviews.llvm.org/D63885). The patch adds the necessary safety checks to ensure that it safe to fuse the guarded loops (control flow equivalent, no intervening code, and same guard conditions). It also provides an alternative method to perform the actual fusion of guarded loops. The mechanics to fuse guarded loops are slightly different then fusing non-guarded loops, so I opted to keep them separate methods. I will be cleaning this up in later patches, and hope to converge on a single method to fuse both guarded and non-guarded loops, but for now I think the review will be easier to keep them separate. Reviewers: jdoerfert, Meinersbur, dmgreen, etiotto, Whitney Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D65464 llvm-svn: 373018