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

[Jakub Jelinek <jakub@redhat.com>]

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  <jakub@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