test/compiler/regalloc/C1ObjectSpillInLogicOp.java

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/*
 * @test
 * @bug 8027751
 * @requires vm.gc=="G1" | vm.gc=="null"
 * @summary C1 crashes generating G1 post-barrier in Unsafe.getAndSetObject() intrinsic because of the new value spill
 * @run main/othervm -XX:+UseG1GC C1ObjectSpillInLogicOp
 *
 * G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT.
 * The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack.
 * There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT
 * can be spilled just fine, and in that case the xor emission will fail.
 */

import java.util.concurrent.atomic.*;

public class C1ObjectSpillInLogicOp {
  public static void main(String[] args) {
    AtomicReferenceArray<Integer> x = new AtomicReferenceArray(128);
    Integer y = new Integer(0);
    for (int i = 0; i < 50000; i++) {
      x.getAndSet(i % x.length(), y);
    }
  }
}