------- Comment #3 from krebbel at gcc dot gnu dot org 2010-04-07 15:56 -------
Created an attachment (id=20328)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20328&action=view)
Reduced testcase
The check for valid sibcalls in the S/390 back-end relies on the decl to be
available in the DECL parameter:
/* The 31 bit PLT code uses register 12 (GOT pointer - caller saved)
which would have to be restored before the sibcall. */
if (!TARGET_64BIT && flag_pic && decl && !targetm.binds_local_p (decl))
return false;
The type cast of the function pointer in the testcase introduces a temporary
variable on 4.5 which is not linked with the function decl anymore:
x_1 = (void (*<T244>) (float) (*<T248>) (void *)) d;
D.1966_3 = x_1 (p_2(D)); [tail call]
return D.1966_3;
With 4.4:
D.1224 = (void (*<T242>) (float) (*<T246>) (void *)) d (p); [tail call]
return D.1224;
So we probably have to always reject sibcalls if the fndecl is not reachable.
--
krebbel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #20300|0 |1
is obsolete| |
AssignedTo|unassigned at gcc dot gnu |krebbel at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43635
