diff options
Diffstat (limited to 'lib/Target/Mips/MipsISelDAGToDAG.cpp')
| -rw-r--r-- | lib/Target/Mips/MipsISelDAGToDAG.cpp | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/lib/Target/Mips/MipsISelDAGToDAG.cpp b/lib/Target/Mips/MipsISelDAGToDAG.cpp index 810dce1..cbcedb8 100644 --- a/lib/Target/Mips/MipsISelDAGToDAG.cpp +++ b/lib/Target/Mips/MipsISelDAGToDAG.cpp @@ -108,7 +108,6 @@ private: /// InstructionSelect - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. void MipsDAGToDAGISel::InstructionSelect() { - DEBUG(BB->dump()); // Codegen the basic block. DEBUG(errs() << "===== Instruction selection begins:\n"); DEBUG(Indent = 0); @@ -171,6 +170,27 @@ SelectAddr(SDValue Op, SDValue Addr, SDValue &Offset, SDValue &Base) return true; } } + + // When loading from constant pools, load the lower address part in + // the instruction itself. Instead of: + // lui $2, %hi($CPI1_0) + // addiu $2, $2, %lo($CPI1_0) + // lwc1 $f0, 0($2) + // Generate: + // lui $2, %hi($CPI1_0) + // lwc1 $f0, %lo($CPI1_0)($2) + if (Addr.getOperand(0).getOpcode() == MipsISD::Hi && + Addr.getOperand(1).getOpcode() == MipsISD::Lo) { + SDValue LoVal = Addr.getOperand(1); + if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>( + LoVal.getOperand(0))) { + if (!CP->getOffset()) { + Base = Addr.getOperand(0); + Offset = LoVal.getOperand(0); + return true; + } + } + } } Base = Addr; @@ -315,6 +335,16 @@ SDNode* MipsDAGToDAGISel::Select(SDValue N) { case ISD::GLOBAL_OFFSET_TABLE: return getGlobalBaseReg(); + case ISD::ConstantFP: { + ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(N); + if (N.getValueType() == MVT::f64 && CN->isExactlyValue(+0.0)) { + SDValue Zero = CurDAG->getRegister(Mips::ZERO, MVT::i32); + ReplaceUses(N, Zero); + return Zero.getNode(); + } + break; + } + /// Handle direct and indirect calls when using PIC. On PIC, when /// GOT is smaller than about 64k (small code) the GA target is /// loaded with only one instruction. Otherwise GA's target must |
