[LoopUnroll] Don't verify domtree by default with +Asserts.
This verification is linear in the size of the function, so it can cause
a quadratic compile-time explosion in a function with many loops to
unroll.
Differential Revision: https://reviews.llvm.org/D54732
llvm-svn: 349871
diff --git a/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp b/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
index 86ac1a7..151a285 100644
--- a/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -615,7 +615,9 @@
// the original loop body.
if (Iter == 0)
DT->changeImmediateDominator(Exit, cast<BasicBlock>(LVMap[Latch]));
+#ifdef EXPENSIVE_CHECKS
assert(DT->verify(DominatorTree::VerificationLevel::Fast));
+#endif
}
auto *LatchBRCopy = cast<BranchInst>(VMap[LatchBR]);