------- Comment #34 from gcc at troy dot rollo dot name 2007-03-06 03:51
-------
The problem looks like a bug in GCC's optimisation in 4.1.1 - for the following
code:
152 while (--delete_count>=0) {
153 zval *q = *(zval **)(--p);
154 *p = NULL;
(gdb) l
155 zval_ptr_dtor(&q);
156 }
157 EG(argument_stack).top_element = p;
('p' is declared as void **)
it is producing:
add %fp, -20, %l3
L1 clr %g1
add %l0, -4, %l0
st %g1, [ %fp + -20 ]
clr [ %l0 ]
call 0x261ea4 <_zval_ptr_dtor>
mov %l3, %o0
inc %l1
cmp %l2, %l1
bne L1
%l0 contains the pointer "p". %l3 contains &q (q is at %fp-20).
Notice that %g1 (which is set to 0 at L1) is always being stored
in "q".
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30819
