Hi,
this test started to fail very recently on 32-bit platforms with 64-bit HWI.
Not sure exactly why, but the issue is straightforward and was latent.
For the following reference, a call to ao_ref_init_from_ptr_and_size yields:
(gdb) p debug_generic_expr((tree_node *) 0x7ffff6e01200)
&a[0 ...]{lb: 4294967292 sz: 4}
(gdb) p debug_generic_expr(size)
20
(gdb) p dref
$36 = {ref = 0x0, base = 0x7ffff6dfd260, offset = -137438953344, size = 160,
max_size = 160, ref_alias_set = 0, base_alias_set = 0, volatile_p = false}
The offset is bogus. 'a' is an array with lower bound -4 so {lb: 4294967292
sz: 4} is actually {lb: -4 sz: 4}. The computation of the offset goes wrong
in get_addr_base_and_unit_offset_1 because it is not done in sizetype.
Fixed by copying the relevant bits from get_ref_base_and_extent, where the
computation is correctly done in sizetype.
Tested on x86_64-suse-linux, OK for the mainline?
2013-11-30 Eric Botcazou <ebotcazou@adacore.com>
* tree-dfa.h (get_addr_base_and_unit_offset_1) <case ARRAY_REF>: Do the
offset computation using the precision of the index type.
2013-11-30 Eric Botcazou <ebotcazou@adacore.com>
* gnat.dg/opt30.adb: New test.