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Evan, A test case is extremely hard to pin down. For months now, we've noticed our stage 2 LLVM ARM build has sporadic failures. Tests would start failing, then start working, then start failing, etc, for no apparent reason. The test case I have (llc.bc, which is all of llc in bitcode form, 44.8 MB), only works against r149814. And in this case, there are only 2 cases of the miscompile