On Thu, Aug 28, 2014 at 10:37 AM, Ilya Enkovich <enkovich....@gmail.com> wrote: > 2014-08-28 1:39 GMT+04:00 Jeff Law <l...@redhat.com>: >> On 08/26/14 15:42, Ilya Enkovich wrote: >>> >>> diff --git a/gcc/calls.c b/gcc/calls.c >>> index 4285ec1..85dae6b 100644 >>> --- a/gcc/calls.c >>> +++ b/gcc/calls.c >>> @@ -1122,6 +1122,14 @@ initialize_argument_information (int num_actuals >>> ATTRIBUTE_UNUSED, >>> call_expr_arg_iterator iter; >>> tree arg; >>> >>> + if (targetm.calls.implicit_pic_arg (fndecl ? fndecl : fntype)) >>> + { >>> + gcc_assert (pic_offset_table_rtx); >>> + args[j].tree_value = make_tree (ptr_type_node, >>> + pic_offset_table_rtx); >>> + j--; >>> + } >>> + >>> if (struct_value_addr_value) >>> { >>> args[j].tree_value = struct_value_addr_value; >> >> So why do you need this? Can't this be handled in the call/call_value >> expanders or what about attaching the use to CALL_INSN_FUNCTION_USAGE from >> inside ix86_expand_call? Basically I'm not seeing the need for another >> target hook here. I think that would significantly simply the patch as >> well. > > GOT base address become an additional implicit arg with EBX relaxed > and I handled it as all other args. I can move EBX initialization into > ix86_expand_call. Would still need some hint from target to init > pic_offset_table_rtx with proper value in the beginning of function > expand.
Maybe you can you use get_hard_reg_initial_val for this? Uros.