if (i instanceof IfInstruction) {
IfInstruction ii = (IfInstruction) i;
InstructionHandle target = ii.getTarget();
InstructionHandle next = head.getNext();
if (target.equals(next)) {
int consumed = ii.consumeStack(methodGen.getConstantPool());
if (consumed != 1 && consumed != 2) {
throw new IllegalStateException();
}
head.swapInstruction(consumed == 1 ? new POP() : new POP2());
}