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Fixed a bug where moves due to phis were being neglected.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5019 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2002-12-13 12:33:31 +00:00
parent 84b7207df8
commit 0868667f78
1 changed files with 19 additions and 23 deletions
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42
lib/CodeGen/RegAllocSimple.cpp
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@ -253,7 +253,7 @@ bool RegAllocSimple::runOnMachineFunction(MachineFunction &Fn) {
if (targetReg.isVirtualRegister()) {
physReg = getFreeReg(virtualReg);
} else {
physReg = targetReg.getAllocatedRegNum();
physReg = virtualReg;
}
// Find the register class of the target register: should be the
@ -293,29 +293,25 @@ bool RegAllocSimple::runOnMachineFunction(MachineFunction &Fn) {
++opI;
// insert the move just before the return/branch
if (MII.isReturn(opMI->getOpcode()) || MII.isBranch(opMI->getOpcode()))
// Retrieve the constant value from this op, move it to target
// register of the phi
if (opVal.getType() == MachineOperand::MO_SignExtendedImmed ||
opVal.getType() == MachineOperand::MO_UnextendedImmed)
{
// Retrieve the constant value from this op, move it to target
// register of the phi
if (opVal.getType() == MachineOperand::MO_SignExtendedImmed ||
opVal.getType() == MachineOperand::MO_UnextendedImmed)
{
opI = RegInfo->moveImm2Reg(opBlock, opI, physReg,
(unsigned) opVal.getImmedValue(),
dataSize);
saveVirtRegToStack(opBlock, opI, virtualReg, physReg);
} else {
// Allocate a physical register and add a move in the BB
unsigned opVirtualReg = (unsigned) opVal.getAllocatedRegNum();
unsigned opPhysReg; // = getFreeReg(opVirtualReg);
opI = moveUseToReg(opBlock, opI, opVirtualReg, opPhysReg);
opI = RegInfo->moveReg2Reg(opBlock, opI, physReg, opPhysReg,
dataSize);
// Save that register value to the stack of the TARGET REG
saveVirtRegToStack(opBlock, opI, virtualReg, opPhysReg);
}
}
opI = RegInfo->moveImm2Reg(opBlock, opI, physReg,
(unsigned) opVal.getImmedValue(),
dataSize);
saveVirtRegToStack(opBlock, opI, virtualReg, physReg);
} else {
// Allocate a physical register and add a move in the BB
unsigned opVirtualReg = (unsigned) opVal.getAllocatedRegNum();
unsigned opPhysReg; // = getFreeReg(opVirtualReg);
opI = moveUseToReg(opBlock, opI, opVirtualReg, physReg);
//opI = RegInfo->moveReg2Reg(opBlock, opI, physReg, opPhysReg,
// dataSize);
// Save that register value to the stack of the TARGET REG
saveVirtRegToStack(opBlock, opI, virtualReg, physReg);
}
// make regs available to other instructions
clearAllRegs();