public override void Transform(Context context, TransformContext transformContext)
{
//Debug.Assert(context.ConditionCode != ConditionCode.Equal);
var operand1 = context.Operand1;
var operand2 = context.Operand2;
var target = context.BranchTargets[0];
var branch = context.ConditionCode;
var branchUnsigned = context.ConditionCode.GetUnsigned();
var nextBlock = transformContext.Split(context);
var newBlocks = transformContext.CreateNewBlockContexts(4, context.Label);
// no branch
TransformContext.UpdatePHIInstructionTargets(nextBlock.Block.NextBlocks, context.Block, nextBlock.Block);
// Branch
TransformContext.UpdatePHIInstructionTarget(target, context.Block, newBlocks[3].Block);
var op0Low = transformContext.AllocateVirtualRegister32();
var op0High = transformContext.AllocateVirtualRegister32();
var op1Low = transformContext.AllocateVirtualRegister32();
var op1High = transformContext.AllocateVirtualRegister32();
context.SetInstruction(IRInstruction.GetLow32, op0Low, operand1);
context.AppendInstruction(IRInstruction.GetHigh32, op0High, operand1);
context.AppendInstruction(IRInstruction.GetLow32, op1Low, operand2);
context.AppendInstruction(IRInstruction.GetHigh32, op1High, operand2);
// Compare high (equal)
context.AppendInstruction(IRInstruction.Branch32, ConditionCode.Equal, null, op0High, op1High, newBlocks[1].Block);
context.AppendInstruction(IRInstruction.Jmp, newBlocks[0].Block);
// Compare high
newBlocks[0].AppendInstruction(IRInstruction.Branch32, branch, null, op0High, op1High, newBlocks[3].Block);
newBlocks[0].AppendInstruction(IRInstruction.Jmp, newBlocks[2].Block);
// Compare low
newBlocks[1].AppendInstruction(IRInstruction.Branch32, branchUnsigned, null, op0Low, op1Low, newBlocks[3].Block);
newBlocks[1].AppendInstruction(IRInstruction.Jmp, newBlocks[2].Block);
// No branch
newBlocks[2].AppendInstruction(IRInstruction.Jmp, nextBlock.Block);
// Branch
newBlocks[3].AppendInstruction(IRInstruction.Jmp, target);
}
