| commit | a86fa4455b22e4633118a6e4b5b0aa4c3dc9f24c | [log] [tgz] |
|---|---|---|
| author | Chris Lattner <sabre@nondot.org> | Tue Jan 11 04:25:13 2005 +0000 |
| committer | Chris Lattner <sabre@nondot.org> | Tue Jan 11 04:25:13 2005 +0000 |
| tree | 476aec41807cb4a698074e5823d720dc73476132 | |
| parent | 37ed28558f79e63251be4e59e4bfd55c39a4a3e4 [diff] [blame] |
shift X, 0 -> X llvm-svn: 19453
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index d173a95..ef0b076 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -612,6 +612,12 @@ } break; + case ISD::SHL: + case ISD::SRL: + case ISD::SRA: + if (C2 == 0) return N1; + break; + case ISD::AND: if (!C2) return N2; // X and 0 -> 0 if (N2C->isAllOnesValue())