[PATCH] Select Elimination in InstCombine

[David Majnemer]

================
Comment at: lib/Transforms/InstCombine/InstCombineCompares.cpp:2438
@@ +2437,3 @@
+    auto *User = cast<Instruction>(U.getUser());
+    if (User != UI && !(DT && DT->dominates(DB, User->getParent())))
+      return false;
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`DT` is invariant of this loop, you could hoist it out of the loop (return false).

http://reviews.llvm.org/D5258