[gcc(refs/users/marxin/heads/PR106816-mv-attributes)] ipa: propagate attributes for target attribute clones

[Martin Liska <marxin@gcc.gnu.org>]

https://gcc.gnu.org/g:816b951f2ae3f81485597170f83ce15e70a27c35

commit 816b951f2ae3f81485597170f83ce15e70a27c35
Author: Martin Liska <mliska@suse.cz>
Date:   Fri Mar 31 12:16:34 2023 +0200

    ipa: propagate attributes for target attribute clones
    
            PR ipa/106816
    
    gcc/ChangeLog:
    
            * config/i386/i386-features.cc (ix86_get_function_versions_dispatcher):
            Propagate function attributes for clones.
    
    gcc/testsuite/ChangeLog:
    
            * g++.target/i386/pr106816.C: New test.
    
    Co-Authored-By: H.J. Lu <hjl.tools@gmail.com>

Diff:
---
 gcc/config/i386/i386-features.cc         |  1 +
 gcc/testsuite/g++.target/i386/pr106816.C | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/gcc/config/i386/i386-features.cc b/gcc/config/i386/i386-features.cc
index c09abf8fc20..f2b0d59a73c 100644
--- a/gcc/config/i386/i386-features.cc
+++ b/gcc/config/i386/i386-features.cc
@@ -3379,6 +3379,7 @@ ix86_get_function_versions_dispatcher (void *decl)
       /* Right now, the dispatching is done via ifunc.  */
       dispatch_decl = make_dispatcher_decl (default_node->decl);
       TREE_NOTHROW (dispatch_decl) = TREE_NOTHROW (fn);
+      TREE_THIS_VOLATILE (dispatch_decl) = TREE_THIS_VOLATILE (fn);
 
       dispatcher_node = cgraph_node::get_create (dispatch_decl);
       gcc_assert (dispatcher_node != NULL);
diff --git a/gcc/testsuite/g++.target/i386/pr106816.C b/gcc/testsuite/g++.target/i386/pr106816.C
new file mode 100644
index 00000000000..0f5cc1f13dd
--- /dev/null
+++ b/gcc/testsuite/g++.target/i386/pr106816.C
@@ -0,0 +1,23 @@
+// PR ipa/106816
+
+// { dg-do compile }
+// { dg-require-ifunc "" }
+// { dg-options "-O2 -fdump-tree-optimized" }
+
+__attribute__((noreturn, target("default"))) void f()
+{
+  for (;;) {}
+}
+
+__attribute__((noreturn, target("sse4.2,bmi"))) void f()
+{
+  for (;;) {}
+}
+
+int main()
+{
+  f();
+  return 12345;
+}
+
+/* { dg-final { scan-tree-dump-not "12345" "optimized" } } */