On 03/05/2012 09:49 AM, Jonathan Wakely wrote: > On 5 March 2012 06:04, Jeffrey Walton wrote: >> Does C/C++ or GCC offer any alignment guarantees? > > Alignment requirements are implementation-defined, usually imposed by > the hardware. Or the system ABI. > C++ and GCC guarantee that data you declare or dynamically allocate > will be correctly aligned, they don't guarantee that playing tricks > with casts will produce correctly aligned data, whether that works > depends on the hardware. That's not quite right. As long as you follow the rules in the C and C++ standards, everything will be correctly aligned. If you do anything that is undefined according to the rules, all bets are off. Andrew.
