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Add a top-level comment about DAGCombiner's role in the compiler.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70052 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -10,6 +10,10 @@
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// This pass combines dag nodes to form fewer, simpler DAG nodes. It can be run
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// both before and after the DAG is legalized.
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//
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// This pass is not a substitute for the LLVM IR instcombine pass. This pass is
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// primarily intended to handle simplification opportunities that are implicit
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// in the LLVM IR and exposed by the various codegen lowering phases.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "dagcombine"
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