if (Result != -1)
return ConstantInt::get(Type::getInt1Ty(Context), Result);
+ // If the right hand side is a bitcast, try using its inverse to simplify
+ // it by moving it to the left hand side.
+ if (ConstantExpr *CE2 = dyn_cast<ConstantExpr>(C2)) {
+ if (CE2->getOpcode() == Instruction::BitCast) {
+ Constant *CE2Op0 = CE2->getOperand(0);
+ Constant *Inverse = ConstantExpr::getBitCast(C1, CE2Op0->getType());
+ return ConstantExpr::getICmp(pred, Inverse, CE2Op0);
+ }
+ }
+
if (!isa<ConstantExpr>(C1) && isa<ConstantExpr>(C2)) {
// If C2 is a constant expr and C1 isn't, flip them around and fold the
// other way if possible.