[gcc r14-9578] nios2: Fix up nios2_setup_incoming_varargs [PR114175]

[Jakub Jelinek]

https://gcc.gnu.org/g:4c9d2810908004b7e04599b426aca5ee1bd16735

commit r14-9578-g4c9d2810908004b7e04599b426aca5ee1bd16735
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Mar 20 17:00:08 2024 +0100

    nios2: Fix up nios2_setup_incoming_varargs [PR114175]
    
    Like for x86-64, alpha or rs6000, nios2 seems to be affected too.
    
    Just visually checked differences in c23-stdarg-9.c assembly in a cross
    without/with the patch, committed to trunk.
    
    2024-03-20  Jakub Jelinek  <jakub@redhat.com>
    
            PR target/114175
            * config/nios2/nios2.cc (nios2_setup_incoming_varargs): Only skip
            nios2_function_arg_advance for TYPE_NO_NAMED_ARGS_STDARG_P functions
            if arg.type is NULL.

Diff:
---
 gcc/config/nios2/nios2.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/config/nios2/nios2.cc b/gcc/config/nios2/nios2.cc
index fba13c34dae..a981e5095ef 100644
--- a/gcc/config/nios2/nios2.cc
+++ b/gcc/config/nios2/nios2.cc
@@ -3525,7 +3525,8 @@ nios2_setup_incoming_varargs (cumulative_args_t cum_v,
 
   cfun->machine->uses_anonymous_args = 1;
   local_cum = *cum;
-  if (!TYPE_NO_NAMED_ARGS_STDARG_P (TREE_TYPE (current_function_decl)))
+  if (!TYPE_NO_NAMED_ARGS_STDARG_P (TREE_TYPE (current_function_decl))
+      || arg.type != NULL_TREE)
     nios2_function_arg_advance (local_cum_v, arg);
 
   regs_to_push = NUM_ARG_REGS - local_cum.regs_used;