From 08da55eeff8fdacd232e69c76bc5142eb4b1474e Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 4 Apr 2006 01:02:22 +0000 Subject: [PATCH] Constant fold bitconvert(undef) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27391 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 6eb6570467f..a2b575ff31d 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1167,6 +1167,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, if (VT == Operand.getValueType()) return Operand; // noop conversion. if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x) return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0)); + if (OpOpcode == ISD::UNDEF) + return getNode(ISD::UNDEF, VT); break; case ISD::SCALAR_TO_VECTOR: assert(MVT::isVector(VT) && !MVT::isVector(Operand.getValueType()) &&