kum writes: > Hi, > > UINT64 a64; // UINT64 has been typedefed as long long unsigned int > UINT32 a32, b32; > a32 = x; // some value > b32 = y; // some value > > a64 = a32 * b32; > a64 += a32 + b32; > > Is it necessary to type-cast both a32 and b32 to yield correct 64 bit > results? Without casting, I find that addition (even if the result > overflows) works while the multiplication does not. Is there a > compiler option to make this work without casting? I am using gcc > 4.1.1 on an xscale platform. You have to cast at leat one of the operands in a binary operation to get the widening to anything wider than int. Andrew.
