On Tue, Jun 28, 2005 at 03:31:59PM -0400, Robert Dewar wrote: > Gabriel Dos Reis wrote: > > >The strict aliasing rule by itself does not show it is not a high level > >assembly language. There are chips out there where you cannot access > >data willy-nilly through random register types. > > And there are chips for which signed arithmetic is not wrap around!
No, there are not. There are chips that possess a signed add instruction that traps, but those same chips possess an unsigned add instruction that does not trap, so any sane C compiler writer would choose the latter instruction. At the instruction level, there are no signed or unsigned operands, only signed or unsigned operations. I challenge you, Robert, to find us a C compiler that generates trapping instructions for integer adds by default. I do not believe that such a compiler exists.
