https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104274
David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-02-10
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed (with --target=hppa64-hpux11.3)
pr97029.c.006t.gimple with x86_64 has...
VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
void setjmp (struct vj pl)
{
setjmp (pl);
}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...whereas with --target=hppa64-hpux11.3 has:
VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
void setjmp (struct vj pl)
{
struct vj pl.0;
setjmp (pl.0);
}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It still happens if I rename the function from "setjmp" to "foo".
It no longer happens if I add a dummy field to the struct.
The temporary "pl.0" is created on hppa by:
#4 0x0000000000aa7b3a in gimplify_parameters
(cleanup=cleanup@entry=0x7fffffffd9b0) at ../../src/gcc/function.cc:3939
3926 tree type = TREE_TYPE (data.arg.type);
3927 function_arg_info orig_arg (type, data.arg.named);
3928 if (reference_callee_copied (&all.args_so_far_v, orig_arg))
3929 {
3930 tree local, t;
3931
3932 /* For constant-sized objects, this is trivial; for
3933 variable-sized objects, we have to play games. */
3934 if (TREE_CODE (DECL_SIZE_UNIT (parm)) == INTEGER_CST
3935 && !(flag_stack_check == GENERIC_STACK_CHECK
3936 && compare_tree_int (DECL_SIZE_UNIT (parm),
3937 STACK_CHECK_MAX_VAR_SIZE) >
0))
3938 {
3939 local = create_tmp_var (type, get_name (parm));
3940 DECL_IGNORED_P (local) = 0;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
and never assigned to.
