John Boncek <jboncek@xxxxxxxxxx> writes: > I have turned on -Wcast-align in a big C++ project for ARM PXA270 > architecture and am receiving many warnings of the form: > > warning: cast from `BYTE*' to `short int*' increases required alignment of > target type > > This sounds like there will be a performance penalty to generate the correct > alignment for this. Is that correct? It depends on the actual value of the pointer. If you take the address of a short, cast it to char*, and then cast back to short*, you will get the warning, but there won't be any performance penalty. In other words, you will get that warning if you use char* like void*. If you are taking the address of a char array and then casting that to short*, then you may indeed have a performance penalty. And on some platforms your program won't work at all. Ian
