https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128437
--- Comment #11 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #10)
> (In reply to Drea Pinski from comment #9)
> > (In reply to Uroš Bizjak from comment #8)
> > > (In reply to Drea Pinski from comment #7)
> > > > is not being deleting. I think this is due to this being a call_insn.
> > > > No
> > > > other target uses call here .... So back to a target specific issue.
> > >
> > > Please see bug 110606 comment 7. PPC defines it in the same way.
> >
> > I wonder if we mark the call as being pure/const things will just work.
> It already is marked as const:
>
> start_sequence ();
> rtx_insn *call_insn = emit_call_insn
> (gen_tls_local_dynamic_base_64 (Pmode, rax, caddr, rdi));
> CALL_INSN_ABI_ID (call_insn)
> = ix86_tls_get_addr_abi ().id ();
> insns = end_sequence ();
>
> /* Attach a unique REG_EQUAL, to allow the RTL optimizers to
> share the LD_BASE result with other LD model accesses. */
> eqv = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, const0_rtx),
> UNSPEC_TLS_LD_BASE);
>
> RTL_CONST_CALL_P (insns) = 1;
> emit_libcall_block (insns, base, rax, eqv);
The check in dce.cc is:
```
if (CALL_P (insn)
/* We cannot delete calls inside of the recursive dce because
this may cause basic blocks to be deleted and this messes up
the rest of the stack of optimization passes. */
&& (!df_in_progress)
/* We cannot delete pure or const sibling calls because it is
hard to see the result. */
&& (!SIBLING_CALL_P (insn))
/* We can delete dead const or pure calls as long as they do not
infinite loop. */
&& (RTL_CONST_OR_PURE_CALL_P (insn)
&& !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn))
/* Don't delete calls that may throw if we cannot do so. */
&& can_delete_call (insn))
return find_call_stack_args (as_a <rtx_call_insn *> (insn), false,
fast, arg_stores);
```
The question is what is failing here on why it is not being deletable too. Is
it find_call_stack_args or somethign else?
