Add test for optimization with qubit array alias

  EXPECT_EQ(countSubstring(llvm, "__quantum__qis__cnot"), 6);

}

TEST(qasm3PassManagerTester, checkQubitArrayAlias) {

  {

    // Check SSA value chain with alias

    // h-t-h == rx (t is equiv. to rz)

    const std::string src = R"#(OPENQASM 3;

include "qelib1.inc";

qubit q[6];

let my_reg = q[1, 3, 5];

h q[1];

t my_reg[0];

h q[1];

)#";

    auto llvm =

        qcor::mlir_compile(src, "test_kernel", qcor::OutputType::LLVMIR, false);

    std::cout << "LLVM:\n" << llvm << "\n";

    // Get the main kernel section only (there is the oracle LLVM section as

    // well)

    llvm = llvm.substr(llvm.find("@__internal_mlir_test_kernel"));

    const auto last = llvm.find_first_of("}");

    llvm = llvm.substr(0, last + 1);

    std::cout << "LLVM:\n" << llvm << "\n";

    EXPECT_EQ(countSubstring(llvm, "__quantum__qis"), 1);

    // One Rx

    EXPECT_EQ(countSubstring(llvm, "__quantum__qis__rx"), 1);

  }

  {

    // Check optimization can work with alias array

    const std::string src = R"#(OPENQASM 3;

include "qelib1.inc";

qubit q[4];

let first_and_last_qubit = q[0] || q[3];

cx q[0], q[3];

cx first_and_last_qubit[0], first_and_last_qubit[1];

)#";

    auto llvm =

        qcor::mlir_compile(src, "test_kernel", qcor::OutputType::LLVMIR, false);

    std::cout << "LLVM:\n" << llvm << "\n";

    // Get the main kernel section only (there is the oracle LLVM section as

    // well)

    llvm = llvm.substr(llvm.find("@__internal_mlir_test_kernel"));

    const auto last = llvm.find_first_of("}");

    llvm = llvm.substr(0, last + 1);

    std::cout << "LLVM:\n" << llvm << "\n";

    // Cancel all => No gates, extract, or alloc/dealloc:

    EXPECT_EQ(countSubstring(llvm, "__quantum__qis"), 0);

  }

}

int main(int argc, char **argv) {

  ::testing::InitGoogleTest(&argc, argv);

  auto ret = RUN_ALL_TESTS();