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package com.seaofnodes.simple;
import com.seaofnodes.simple.node.*;
import com.seaofnodes.simple.type.*;
import org.junit.Test;
import static org.junit.Assert.*;
public class IntegerIdentityTest {
private static final String[] OPS = {"And","Or","Xor","Shl","Sar","Shr","Add","Mul","Div"};
@Test public void testIdentityWaitsForIntegerInput() {
new Parser("return 0;").parse();
for( String name : OPS ) {
Node lhs = input(Type.BOTTOM);
Node rhs = input(TypeInteger.constant(identity(name)));
Node op = op(name,lhs,rhs);
assertFalse(name,lhs._type.isa(op.compute()));
assertNull(name,op.idealize());
// Model a provisional input lifting to int. The same fold can now fire.
lhs._type = TypeInteger.BOT;
assertSame(name,lhs,op.idealize());
assertTrue(name,lhs._type.isa(op.compute()));
}
}
@Test public void testNonIntegerIdentityCannotEraseTheOperator() {
new Parser("return 0;").parse();
for( Type type : new Type[]{TypeFloat.constant(3.5)} )
for( String name : OPS ) {
Node lhs=input(type);
Node op=op(name,lhs,input(TypeInteger.constant(identity(name))));
assertNull(name,op.idealize());
}
}
@Test public void testIntegerIdentitiesAndMaskedShiftsStillFold() {
new Parser("return 0;").parse();
for( String name : OPS )
for( Type type : new Type[]{TypeInteger.BOT,TypeInteger.make(2,7),TypeInteger.constant(5)} ) {
Node lhs=input(type);
long[] identities = name.equals("And") ? new long[]{-1} :
name.equals("Shl") || name.equals("Sar") || name.equals("Shr") ? new long[]{0,64,-64} : new long[]{identity(name)};
for( long identity : identities ) {
Node op=op(name,lhs,input(TypeInteger.constant(identity)));
assertSame(name,lhs,op.idealize());
assertTrue(name,lhs._type.isa(op.compute()));
}
}
}
// These tests exercise idealize directly, before GVN or constant folding.
private static Node input(Type type) {
Node n = new ConstantNode(type);
n._type=type;
return n;
}
private static long identity(String name) {
return name.equals("And") ? -1 : name.equals("Mul") || name.equals("Div") ? 1 : 0;
}
private static Node op(String name, Node lhs, Node rhs) {
return switch(name) {
case "And" -> new AndNode(lhs,rhs);
case "Or" -> new OrNode(lhs,rhs);
case "Xor" -> new XorNode(lhs,rhs);
case "Shl" -> new ShlNode(lhs,rhs);
case "Sar" -> new SarNode(lhs,rhs);
case "Shr" -> new ShrNode(lhs,rhs);
case "Add" -> new AddNode(lhs,rhs);
case "Mul" -> new MulNode(lhs,rhs);
case "Div" -> new DivNode(lhs,rhs);
default -> throw new AssertionError(name);
};
}
}
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