https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28831
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #28 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
On
struct A { int i[100]; };
void f(struct A);
int main()
{
f((struct A){1});
f((struct A){2});
f((struct A){3});
}
I'm surprised that neither C nor C++ generates clobber stmts after the calls.
If we managed to have clobbers for those, guess some pass early before
expansion could attempt to optimize the cases where non-addressable (can we
trust TREE_ADDRESSABLE at that point?) aggregate automatic vars that are only
ever stored before some call after which the var is clobbered (with no other
call intermixed between the stores), then we could allocate the var in the
stack slot of the call. But if there are some calls in between, say to
initialize some field in the aggregate, then at least for
accumulate-outgoing-args we couldn't do that.
