[PATCH] ipa-strub: Fix handling of _BitInt returns [PR113406]

[Jakub Jelinek]

Hi!

Seems pass_ipa_strub::execute contains a copy of the expand_thunk
code I've changed for _BitInt in r14-6805 PR112941 - larger _BitInts
are aggregate_value_p even when they are is_gimple_reg_type.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux,
ok for trunk?

2024-01-17  Jakub Jelinek  <ja...@redhat.com>

        PR middle-end/113406
        * ipa-strub.cc (pass_ipa_strub::execute): Check aggregate_value_p
        regardless of whether is_gimple_reg_type (restype) or not.

        * gcc.dg/bitint-70.c: New test.

--- gcc/ipa-strub.cc.jj 2024-01-03 11:51:28.374775006 +0100
+++ gcc/ipa-strub.cc    2024-01-16 10:51:03.987463928 +0100
@@ -3174,21 +3174,16 @@ pass_ipa_strub::execute (function *)
                                       resdecl,
                                       build_int_cst (TREE_TYPE (resdecl), 0));
                  }
-               else if (!is_gimple_reg_type (restype))
+               else if (aggregate_value_p (resdecl, TREE_TYPE (thunk_fndecl)))
                  {
-                   if (aggregate_value_p (resdecl, TREE_TYPE (thunk_fndecl)))
-                     {
-                       restmp = resdecl;
+                   restmp = resdecl;
 
-                       if (VAR_P (restmp))
-                         {
-                           add_local_decl (cfun, restmp);
-                           BLOCK_VARS (DECL_INITIAL (current_function_decl))
-                             = restmp;
-                         }
+                   if (VAR_P (restmp))
+                     {
+                       add_local_decl (cfun, restmp);
+                       BLOCK_VARS (DECL_INITIAL (current_function_decl))
+                         = restmp;
                      }
-                   else
-                     restmp = create_tmp_var (restype, "retval");
                  }
                else
                  restmp = create_tmp_reg (restype, "retval");
--- gcc/testsuite/gcc.dg/bitint-70.c.jj 2024-01-16 11:01:48.300524130 +0100
+++ gcc/testsuite/gcc.dg/bitint-70.c    2024-01-16 11:01:19.456924333 +0100
@@ -0,0 +1,14 @@
+/* PR middle-end/113406 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-std=c23 -fstrub=internal" } */
+/* { dg-require-effective-target strub } */
+
+#if __BITINT_MAXWIDTH__ >= 146
+_BitInt(146)
+#else
+_BitInt(16)
+#endif
+foo (void)
+{
+  return 0;
+}

        Jakub