Compiler/TDA2: EVE/VCOP Question about __agen

Part Number:TDA2

Tool/software: TI C/C++ Compiler

Hi, 

I try release next equation for agen

__agen kLeft = I1 * blockW * sizeof(*img) + I2 * VCOP_SIMD_WIDTH * sizeof(*img) - I3 * sizeof(*img);

There is no problems in host emulation. But eve compiler doesn't understand "-" near I3. In programming guide it is writen example with negative adress. I rewrite next way

.__agen kLeft = I3 * -sizeof(*img) + I1 * blockW * sizeof(*img) + I2 * VCOP_SIMD_WIDTH * sizeof(*img);

There is no compiler errors. but still result is wrong. Could your help me, whis syntax is right in this case?