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| author | Chris Lattner <sabre@nondot.org> | 2006-05-05 21:34:35 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-05-05 21:34:35 +0000 |
| commit | e564dbb51ca1ad9ff6d88ae6120782a48bd040c2 (patch) | |
| tree | 889c227f1451f11d12efca976be4d48ed9abf766 /lib/CodeGen | |
| parent | 903236468c3ebb3f9ae8f51b6f2e68f10c7e1d3a (diff) | |
| download | llvm-e564dbb51ca1ad9ff6d88ae6120782a48bd040c2.tar.gz llvm-e564dbb51ca1ad9ff6d88ae6120782a48bd040c2.tar.bz2 llvm-e564dbb51ca1ad9ff6d88ae6120782a48bd040c2.tar.xz | |
Fold (fpext (load x)) -> (extload x)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28130 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
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(); } |