kanishk rastogi wrote: > hi all, > I wanted to know if when i specify -O[0-3] flag to gcc does gcc > optimize the code even violating ABI for that specific arch. > If yes can i specify gcc not to violate the ABI .... > I am mostly concerned witht he ABI specification which tells how to > call another function.. > Only the -Os changes the value of -mpreferred-stack-boundary, breaking the ability to support vectorization or other alignment dependent code in the callee. That change can be over-ridden e.g. by -Os -mpreferred-stack-boundary=4. Evidently, this is a target dependent question. For example, double alignment is maintained by -Os for some targets but not others.
