------- Comment #14 from hjl dot tools at gmail dot com 2008-02-12 23:45 ------- (In reply to comment #13)
> > I think it is wrong to set STACK_BOUNDARY to 128 for 32bit since it is > > hardware related, not ABI related. They should set > > PREFERRED_STACK_BOUNDARY > > instead, which is set to 128 already. On stack alignment branch, we > > introduced a new macro, ABI_STACK_BOUNDARY, to handle different ABIs. > > If you do not align the stack at a 128-bit boundary, your program will > crash. The hardware that it is related to is SSE2. Stack alignment is controlled by PREFERRED_STACK_BOUNDARY. When it is set to 128, gcc will generate codes aligned at 128bit. STACK_BOUNDARY is more or less "natural" hardware stack boundary, which should be the size of pointer. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34621
