From e564dbb51ca1ad9ff6d88ae6120782a48bd040c2 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Fri, 5 May 2006 21:34:35 +0000 Subject: Fold (fpext (load x)) -> (extload x) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28130 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp') diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index a14a0761e7..872242e46f 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2413,6 +2413,20 @@ SDOperand DAGCombiner::visitFP_EXTEND(SDNode *N) { // fold (fp_extend c1fp) -> c1fp if (N0CFP) return DAG.getNode(ISD::FP_EXTEND, VT, N0); + + // fold (fpext (load x)) -> (fpext (fpround (extload x))) + if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() && + (!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType()))) { + SDOperand ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, VT, N0.getOperand(0), + N0.getOperand(1), N0.getOperand(2), + N0.getValueType()); + CombineTo(N, ExtLoad); + CombineTo(N0.Val, DAG.getNode(ISD::FP_ROUND, N0.getValueType(), ExtLoad), + ExtLoad.getValue(1)); + return SDOperand(N, 0); // Return N so it doesn't get rechecked! + } + + return SDOperand(); } -- cgit v1.2.3-18-g5258