diff options
| -rw-r--r-- | lib/Target/SparcV9/SparcV9PrologEpilogInserter.cpp | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/lib/Target/SparcV9/SparcV9PrologEpilogInserter.cpp b/lib/Target/SparcV9/SparcV9PrologEpilogInserter.cpp index b6169c76e8..349cef04f8 100644 --- a/lib/Target/SparcV9/SparcV9PrologEpilogInserter.cpp +++ b/lib/Target/SparcV9/SparcV9PrologEpilogInserter.cpp @@ -15,6 +15,7 @@ #include "llvm/CodeGen/MachineCodeForBasicBlock.h" #include "llvm/CodeGen/MachineCodeForInstruction.h" #include "llvm/CodeGen/MachineInstr.h" +#include "llvm/CodeGen/InstrSelectionSupport.h" #include "llvm/Pass.h" #include "llvm/Function.h" #include "llvm/BasicBlock.h" @@ -83,21 +84,38 @@ void InsertPrologEpilogCode::InsertPrologCode(Function &F) } else { - M = new MachineInstr(SETSW); - M->SetMachineOperandConst(0, MachineOperand::MO_SignExtendedImmed, - - (int) staticStackSize); - M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister, - Target.getRegInfo().getUnifiedRegNum( + // We have to put the stack size value into a register before SAVE. + // Use register %l0 to since it must be unused at function entry. + // Do this by creating a code sequence equivalent to: + // SETSW -(stackSize), %l0 + int32_t C = - (int) staticStackSize; + int uregNum = Target.getRegInfo().getUnifiedRegNum( Target.getRegInfo().getRegClassIDOfType(Type::IntTy), - SparcIntRegOrder::l0)); + SparcIntRegOrder::l0); + + M = new MachineInstr(SETHI); + M->SetMachineOperandConst(0, MachineOperand::MO_SignExtendedImmed, C); + M->SetMachineOperandReg(1, uregNum); + M->setOperandHi32(0); + mvec.push_back(M); + + M = new MachineInstr(OR); + M->SetMachineOperandReg(0, uregNum); + M->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed, C); + M->SetMachineOperandReg(2, uregNum); + M->setOperandLo32(1); mvec.push_back(M); + M = new MachineInstr(SRA); + M->SetMachineOperandReg(0, uregNum); + M->SetMachineOperandConst(1, MachineOperand::MO_UnextendedImmed, 0); + M->SetMachineOperandReg(2, uregNum); + mvec.push_back(M); + + // Now generate the SAVE using the value in register %l0 M = new MachineInstr(SAVE); M->SetMachineOperandReg(0, Target.getRegInfo().getStackPointer()); - M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister, - Target.getRegInfo().getUnifiedRegNum( - Target.getRegInfo().getRegClassIDOfType(Type::IntTy), - SparcIntRegOrder::l0)); + M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister, uregNum); M->SetMachineOperandReg(2, Target.getRegInfo().getStackPointer()); mvec.push_back(M); } |