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| author | Dan Gohman <gohman@apple.com> | 2009-04-25 17:09:45 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-04-25 17:09:45 +0000 |
| commit | 453998792034058e03404d4aaea3460f166cdcea (patch) | |
| tree | f20fd5a3d5df404209d65fa7c7a7abeed8f1d1b5 | |
| parent | df19948ea76f5a5ec213bfaf08a2c31bc1e1c924 (diff) | |
| download | bcm5719-llvm-453998792034058e03404d4aaea3460f166cdcea.tar.gz bcm5719-llvm-453998792034058e03404d4aaea3460f166cdcea.zip | |
Add a top-level comment about DAGCombiner's role in the compiler.
llvm-svn: 70052
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 72b3e3627ed..b937eaff757 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -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" |
