diff options
| author | Rafael Espindola <rafael.espindola@gmail.com> | 2006-12-12 01:03:11 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2006-12-12 01:03:11 +0000 |
| commit | f64945d83c61e540a448de0d0d23cda67c92ebe5 (patch) | |
| tree | cd95462cdaace0fd9db95c1730ef135deb27a189 /lib/Target/ARM/ARMISelDAGToDAG.cpp | |
| parent | 12375467b2da620630cf6bacf90f90aacf8df7e3 (diff) | |
use MVN to handle small negative constants
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32459 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/ARMISelDAGToDAG.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMISelDAGToDAG.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp index 08864a7b6d..48d918c1d6 100644 --- a/lib/Target/ARM/ARMISelDAGToDAG.cpp +++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp @@ -781,6 +781,8 @@ public: virtual void InstructionSelectBasicBlock(SelectionDAG &DAG); bool SelectAddrMode1(SDOperand Op, SDOperand N, SDOperand &Arg, SDOperand &Shift, SDOperand &ShiftType); + bool SelectAddrMode1a(SDOperand Op, SDOperand N, SDOperand &Arg, + SDOperand &Shift, SDOperand &ShiftType); bool SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Arg, SDOperand &Offset); bool SelectAddrMode5(SDOperand Op, SDOperand N, SDOperand &Arg, @@ -883,6 +885,25 @@ bool ARMDAGToDAGISel::SelectAddrMode1(SDOperand Op, return true; } +bool ARMDAGToDAGISel::SelectAddrMode1a(SDOperand Op, + SDOperand N, + SDOperand &Arg, + SDOperand &Shift, + SDOperand &ShiftType) { + if (N.getOpcode() != ISD::Constant) + return false; + + uint32_t val = ~cast<ConstantSDNode>(N)->getValue(); + if(!isRotInt8Immediate(val)) + return false; + + Arg = CurDAG->getTargetConstant(val, MVT::i32); + Shift = CurDAG->getTargetConstant(0, MVT::i32); + ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32); + + return true; +} + bool ARMDAGToDAGISel::SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Arg, SDOperand &Offset) { //TODO: complete and cleanup! |