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9b8cbc08e6
This patch adds support of `llvm.experimental.guard` intrinsics to non-trivial simple loop unswitching. These intrinsics represent implicit control flow which has pretty much the same semantics as usual conditional branches. The algorithm of dealing with them is following: - Consider guards as unswitching candidates; - If a guard is considered the best candidate, turn it into a branch; - Apply normal unswitching algorithm on this branch. The patch has no compile time effect on code that does not contain any guards. Differential Revision: https://reviews.llvm.org/D53744 Reviewed By: chandlerc llvm-svn: 345387