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Add a top-level comment about DAGCombiner's role in the compiler.

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llvm-svn: 70052
This commit is contained in:
Dan Gohman 2009-04-25 17:09:45 +00:00
parent 9eb5ba6eb7
commit 60349bb21e
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -10,6 +10,10 @@
// This pass combines dag nodes to form fewer, simpler DAG nodes. It can be run
// both before and after the DAG is legalized.
//
// This pass is not a substitute for the LLVM IR instcombine pass. This pass is
// primarily intended to handle simplification opportunities that are implicit
// in the LLVM IR and exposed by the various codegen lowering phases.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "dagcombine"