Quartus compiler parameter expression evaluation with power operator (A**) faulty?

Hi

I have encountered a discrepancy between Quartus and ModelSim compilation of parameter expressions containing a power operator (A**B):

module quartus_pow_op_test #(
    parameter F_S_HZ = 100000000,
    parameter F_C_HZ = 300000,
    parameter N_BITS = 34
    )
(
    input  wire clk,
    input  wire reset
);
localparam POW_2_N_BITS_INT = 2**N_BITS;        // valid for N_BITS = 0...30
localparam POW_2_N_BITS_REAL = 2.0**N_BITS;

localparam PHASE_RATE_0 = ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (2.0**N_BITS);
localparam PHASE_RATE_1 = ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (2.0**34);
localparam PHASE_RATE_2 = ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (1.0*(2.0**34));
localparam PHASE_RATE_3 = ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (1.0*(2.0**N_BITS));
localparam PHASE_RATE_4 = ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * POW_2_N_BITS_REAL;

initial begin
    $display("DEBUG: F_S_HZ       = %0f", F_S_HZ);
    $display("DEBUG: F_C_HZ       = %0f", F_C_HZ);
    $display("DEBUG: N_BITS       = %0f", N_BITS);
    $display("DEBUG: 2**N_BITS    = %0f", POW_2_N_BITS_INT);
    $display("DEBUG: 2.0**N_BITS  = %0f (POW_2_N_BITS_REAL)", POW_2_N_BITS_REAL);
    $display("DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (2.0**N_BITS)       = %0f", PHASE_RATE_0);
    $display("DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (2.0**34)           = %0f", PHASE_RATE_1);
    $display("DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (1.0*(2.0**34))     = %0f", PHASE_RATE_2);
    $display("DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (1.0*(2.0**N_BITS)) = %0f", PHASE_RATE_3);
    $display("DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * POW_2_N_BITS_REAL   = %0f", PHASE_RATE_4);
end

endmodule

Result is:

DEBUG: F_S_HZ       = 100000000.000000
DEBUG: F_C_HZ       = 300000.000000
DEBUG: N_BITS       = 34.000000
DEBUG: 2**N_BITS    = 0.000000
DEBUG: 2.0**N_BITS  = 17179869184.000000 (POW_2_N_BITS_REAL)
DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (2.0**N_BITS)       = 0.000000
DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (2.0**34)           = 0.000000
DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (1.0*(2.0**34))     = 51539607.552000
DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * (1.0*(2.0**N_BITS)) = 0.000000
DEBUG: ((1.0*F_C_HZ)/(1.0*F_S_HZ)) * POW_2_N_BITS_REAL   = 51539607.552000

Note that some forms of the expression evaluate to (incorrect) zero - whereas ModelSim compiler evaluates all forms correctly.

Am I missing something here? Also is there a better way of produces info messages during Quartus compile than the above use of $display() in an initial section?

Thanks

Steve