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e147725e
2016 Jan 27
3
DCE in the presence of control flow.
I have been looking at some internal codes looking for differences between Clang (specifically 3.7.1) and gcc (typically 4.8.1 but sometimes later).
One area where I bumped into was dead code elimination in the presence of complex control flow. I note that the “aggressive dead code elimination” (ADCE.cpp) treats all branch operations as live (isa<TerminatorInst>(I)). Doing more requires