From 0e4b922680f55a8e28fc2c3db0b80a1c78d24918 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Thu, 21 Sep 2006 06:40:43 +0000 Subject: [PATCH] fold (aext (and (trunc x), cst)) -> (and x, cst). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30561 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 64014dcb054..f093bf46f68 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1897,6 +1897,21 @@ SDOperand DAGCombiner::visitANY_EXTEND(SDNode *N) { return DAG.getNode(ISD::TRUNCATE, VT, TruncOp); return DAG.getNode(ISD::ANY_EXTEND, VT, TruncOp); } + + // fold (aext (and (trunc x), cst)) -> (and x, cst). + if (N0.getOpcode() == ISD::AND && + N0.getOperand(0).getOpcode() == ISD::TRUNCATE && + N0.getOperand(1).getOpcode() == ISD::Constant) { + SDOperand X = N0.getOperand(0).getOperand(0); + if (X.getValueType() < VT) { + X = DAG.getNode(ISD::ANY_EXTEND, VT, X); + } else if (X.getValueType() > VT) { + X = DAG.getNode(ISD::TRUNCATE, VT, X); + } + uint64_t Mask = cast(N0.getOperand(1))->getValue(); + return DAG.getNode(ISD::AND, VT, X, DAG.getConstant(Mask, VT)); + } + // fold (aext (load x)) -> (aext (truncate (extload x))) if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() && (!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType()))) { -- 2.34.1