diff options
| author | Chris Lattner <sabre@nondot.org> | 2005-12-07 18:02:05 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-12-07 18:02:05 +0000 |
| commit | cc2210b4fa9debfaafa2d385549b0c30448e9c12 (patch) | |
| tree | be6ab7436dc4b2691e397ddbcf3b3a20b6a4db6c /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | e80242a948c77651c7da128a1cebd346523bbcef (diff) | |
Only transform (sext (truncate x)) -> (sextinreg x) if before legalize or
if the target supports the resultant sextinreg
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24632 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index b7f6853f74..7adfecb222 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1547,7 +1547,9 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) { if (N0.getOpcode() == ISD::SEXTLOAD && VT == N0.getValueType()) return N0; // fold (sext (truncate x)) -> (sextinreg x) iff x size == sext size. - if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT) + if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&& + (!AfterLegalize || + TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, N0.getValueType()))) return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0), DAG.getValueType(N0.getValueType())); // fold (sext (load x)) -> (sextload x) |