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| author | Evan Cheng <evan.cheng@apple.com> | 2011-03-14 18:15:55 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2011-03-14 18:15:55 +0000 |
| commit | d2f3b0179763f9c169fe74b7dd19498ac66af1a0 (patch) | |
| tree | d08e79c57672f2da81f77369289a3e52f234d578 /llvm/lib/CodeGen/SelectionDAG | |
| parent | 37588097af55a87a72e9a903f5ac9774dcdff9aa (diff) | |
| download | bcm5719-llvm-d2f3b0179763f9c169fe74b7dd19498ac66af1a0.tar.gz bcm5719-llvm-d2f3b0179763f9c169fe74b7dd19498ac66af1a0.zip | |
Minor optimization. sign-ext/anyext of undef is still undef.
llvm-svn: 127598
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 8deaae935a6..2c97d35618d 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2482,6 +2482,8 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, "Vector element count mismatch!"); if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); + else if (OpOpcode == ISD::UNDEF) + return getUNDEF(VT); break; case ISD::ZERO_EXTEND: assert(VT.isInteger() && Operand.getValueType().isInteger() && @@ -2512,6 +2514,8 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, OpOpcode == ISD::ANY_EXTEND) // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x) return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); + else if (OpOpcode == ISD::UNDEF) + return getUNDEF(VT); // (ext (trunx x)) -> x if (OpOpcode == ISD::TRUNCATE) { |
