diff options
Diffstat (limited to 'lib/Target/X86/X86ISelDAGToDAG.cpp')
| -rw-r--r-- | lib/Target/X86/X86ISelDAGToDAG.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp index fb12ce5..5da7acf 100644 --- a/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -2187,7 +2187,7 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) { if (Opcode != ISD::AND && (Val & RemovedBitsMask) != 0) break; - unsigned ShlOp, Op; + unsigned ShlOp, AddOp, Op; MVT CstVT = NVT; // Check the minimum bitwidth for the new constant. @@ -2208,6 +2208,7 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) { case MVT::i32: assert(CstVT == MVT::i8); ShlOp = X86::SHL32ri; + AddOp = X86::ADD32rr; switch (Opcode) { default: llvm_unreachable("Impossible opcode"); @@ -2219,6 +2220,7 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) { case MVT::i64: assert(CstVT == MVT::i8 || CstVT == MVT::i32); ShlOp = X86::SHL64ri; + AddOp = X86::ADD64rr; switch (Opcode) { default: llvm_unreachable("Impossible opcode"); @@ -2232,6 +2234,9 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) { // Emit the smaller op and the shift. SDValue NewCst = CurDAG->getTargetConstant(Val >> ShlVal, CstVT); SDNode *New = CurDAG->getMachineNode(Op, dl, NVT, N0->getOperand(0),NewCst); + if (ShlVal == 1) + return CurDAG->SelectNodeTo(Node, AddOp, NVT, SDValue(New, 0), + SDValue(New, 0)); return CurDAG->SelectNodeTo(Node, ShlOp, NVT, SDValue(New, 0), getI8Imm(ShlVal)); } |