------- Comment #21 from mikulas at artax dot karlin dot mff dot cuni dot cz
2009-08-08 10:41 -------
Hmm, it still generates the stack frame (and the alignment itself) when there
are structures containing long long and with -malign-double.
Example, compile with -O2 -fomit-frame-pointer -mpreferred-stack-boundary=2
-malign-double:
struct s {
long long a;
int b;
};
void f(struct s *x);
void g(void)
{
struct s x;
f(&x);
}
--- the stack is aligned although it doesn't have to be. Output:
g:
pushl %ebp
movl %esp, %ebp
andl $-8, %esp
subl $20, %esp
leal 4(%esp), %eax
movl %eax, (%esp)
call f
leave
ret
I compile the whole project with -malign-double (so I must use it on all
modules, even integer ones, as it's ABI thing) and I compile integer-only parts
with -mpreferred-stack-boundary=2.
I don't know if you can extend that hack for "structures containing long long"
... but the whole stack alignment thing really needs to be redesigned for
gcc-4.5.
--
mikulas at artax dot karlin dot mff dot cuni dot cz changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40667
