bit-shift operation in the compiler with CCS studio 3.3

We have encountered a problem with a bit-shift operation in the compiler with CCS studio 3.3. Let's consider the following example:

ulong sampleHolder;

for ( j = 0 ; j < 3; j++ ) 

{

   sampleHolder += (SampleData[j].data[index] << (j * 10) ); // 311 format

}

Here I try to bit shift the data in "SampleData" and store it in sampleHolder variable. I need to shift the data 0, 10 and 20 bits to the left. This works for bitshifting of 0 and 10 bits to the left but for 20 it fails (it returns 0).

After that I created a simple example:

ulong sampleHolder;

sampleHolder = 1 << 0;

sampleHolder = 1 << 10;

sampleHolder = 1 << 20;

This also works for the first and second time (0 and 10) but for 20 it fails. This should work properly because ulong is a 32 bit variable.

But then if I use multiplication instead of bit-shifting it works perfectly:

            sampleHolder = 0;

            multiplier = 1;

            for ( j = 0 ; j < 3 ; j++ ) 

            {

                        // Write 3 10 bit samples into a 4 byte variable

                        tempLong = SampleData[j].data[index] * multiplier;

                        sampleHolder += (tempLong); // 311 format

                        multiplier *= 1 << 10;

            }

Could you please analyse the included examples and tell us if we are doing something wrong or is it a compiler error?