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package com.seaofnodes.simple;
import com.seaofnodes.simple.codegen.CodeGen;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class Chapter12Test {
@Test public void testSubZeroFloat() {
var code = new CodeGen("flt x = arg; return 0-x;").parse().opto().typeCheck();
// Compare strings so +0.0 and -0.0 remain distinct.
assertEquals("0.0", Eval2.eval(code,0));
assertEquals("-1.0", Eval2.eval(code,1));
}
@Test public void testDeadNumericReturns() {
for( String[] test : new String[][] {
{"if(1) return 7; else return 2.5;", "7"},
{"if(0) return 7; else return 2.5;", "2.5"},
{"return 7; return 2.5;", "7"},
{"return 2.5; return 7;", "2.5"}
} ) {
String src = test[0];
var code = new CodeGen(src).parse().opto().typeCheck();
assertEquals(src,test[1],Eval2.eval(code,0));
}
}
@Test
public void testJig() {
CodeGen code = new CodeGen(
"""
return 0;
""");
code.parse().opto();
assertEquals("return 0;", code.print());
assertEquals("0", Eval2.eval(code, 0));
}
@Test
public void testFloat() {
CodeGen code = new CodeGen(
"""
flt x = 3.14;
return 0;
""");
code.parse().opto();
assertEquals("return 0;", code.print());
assertEquals("0", Eval2.eval(code, 0));
}
@Test
public void testSquareRoot() {
CodeGen code = new CodeGen(
"""
flt guess = arg;
while( 1 ) {
flt next = (arg/guess + guess)/2;
if( next == guess ) break;
guess = next;
}
return guess;
""");
// TODO: One of the problems with <clinit> returning an OS error code,
// is it chops all results to int.
code.parse().opto();
assertEquals("return Phi(Loop,(flt)arg,((Phi_guess+(ToFloat/Phi_guess))*0.5f));", code.print());
assertEquals("3.0", Eval2.eval(code, 9));
assertEquals("1.414213562373095", Eval2.eval(code, 2));
}
@Test
public void testFPOps() {
CodeGen code = new CodeGen(
"""
flt x = arg;
return x+1==x;
""");
code.parse().opto();
assertEquals("return ((flt)arg==(ToFloat+1.0f));", code.print());
assertEquals("0", Eval2.eval(code, 1));
}
}
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