https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65334
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
We ICE at:
0x080486d9 <+409>: cmp %eax,%ebx
0x080486db <+411>: jge 0x80486c8 <isub4_+392>
=> 0x080486dd <+413>: movdqa 0x80cf41c,%xmm7
0x080486e5 <+421>: movl $0x5,0x10(%edi)
0x080486ec <+428>: movups %xmm7,(%edi)
0x080486ef <+431>: mov %esi,0x30(%esp)
0x080486f3 <+435>: add $0x1c,%esp
0x080486f6 <+438>: pop %ebx
0x080486f7 <+439>: pop %esi
0x080486f8 <+440>: pop %edi
0x080486f9 <+441>: pop %ebp
so this is an alignment issue.
movdqa A.22.3410, %xmm7
movl $5, 16(%edi)
movups %xmm7, (%edi)
The var is defined as follows:
.long 1
.align 4
.type A.94.3694, @object
.size A.94.3694, 20
A.94.3694:
.long 1
.long 2
.long 3
.long 4
.long 5
.set A.22.3410,A.94.3694
so it is not actually aligned. Without ICF we get:
.align 16
.type A.22.3410, @object
.size A.22.3410, 20
A.22.3410:
.long 1
.long 2
.long 3
.long 4
.long 5
So this is an increase_alignment bug - it does not consider aliases.
