------- Comment #56 from mikulas at artax dot karlin dot mff dot cuni dot cz 2009-09-27 09:36 ------- As for this "old code that assumes 16-byte alignment": this is wrong code generated by old versions of gcc. It only works as long as it is called from other gcc >= 3 code (call it from gcc < 3, icc or assembler and it crashes). So you don't have to realign the stack to make sure that the code works always (it doesn't, anyway). All you have to do with this old code is to make sure that you don't make things worse --- i.e. if it worked before, it should continue work after redesign. So all you need is to make a stack frame having a multiple of 16-bytes. No realign needed.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
