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package ir_framework.tests;

import compiler.lib.ir_framework.*;

/*
 * @test
 * @bug 8373355
 * @summary Test that IR matching happens on the whole graph, not just nodes
 *          that can be found by traversing up from the Root.
 * @library /test/lib /
 * @run main ${test.main.class}
 */

public class TestIRFindFromAbove {
    public static boolean flag = false;
    public static int fld = 0;

    public static void main(String[] args) {
        TestFramework.run();
    }

    @Test
    @Warmup(0)
    // Simulate Xcomp with no warmup: ensure the flag branch is not an unstable if
    // but that we compile the infinite loop.
    @IR(counts = {IRNode.LOAD_I, "1", IRNode.STORE_I, "1", ".*NeverBranch.*", "0"},
        phase = CompilePhase.ITER_GVN1)
    @IR(counts = {IRNode.LOAD_I, "1", IRNode.STORE_I, "1", ".*NeverBranch.*", "1"},
        phase = CompilePhase.PHASEIDEALLOOP1)
    public static void test() {
        if (flag) {
            // This loop has no exit. So it is at first not connected down to Root.
            while (true) {
                // During PHASEIDEALLOOP1, we insert a NeverBranch here, with a fake
                // exit, that connects the loop down to Root.
                fld++; // LoadI and StoreI
            }
        }
    }
}