[gcc(refs/users/marxin/heads/PR80223-pgo-attr-do-not-inline-v2)] inline: do not einline when no_profile_instrument_function is different

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

https://gcc.gnu.org/g:2e4fb87072abf07acd7384a338b1c83408c7985f

commit 2e4fb87072abf07acd7384a338b1c83408c7985f
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Jun 22 10:09:01 2021 +0200

    inline: do not einline when no_profile_instrument_function is different
    
            PR gcov-profile/80223
    
    gcc/ChangeLog:
    
            * ipa-inline.c (can_inline_edge_p): Similarly to sanitizer
            options, do not inline when no_profile_instrument_function
            attributes are different in early inliner. It's fine to inline
            it after PGO instrumentation.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/no_profile_instrument_function-attr-2.c: New test.

Diff:
---
 gcc/ipa-inline.c                                        | 17 +++++++++++++++++
 .../gcc.dg/no_profile_instrument_function-attr-2.c      | 15 +++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/gcc/ipa-inline.c b/gcc/ipa-inline.c
index 413446bcc46..012b326b5e9 100644
--- a/gcc/ipa-inline.c
+++ b/gcc/ipa-inline.c
@@ -396,6 +396,23 @@ can_inline_edge_p (struct cgraph_edge *e, bool report,
       e->inline_failed = CIF_SANITIZE_ATTRIBUTE_MISMATCH;
       inlinable = false;
     }
+  else if (profile_arc_flag
+	   && (lookup_attribute ("no_profile_instrument_function",
+				 DECL_ATTRIBUTES (caller->decl)) == NULL_TREE)
+	   != (lookup_attribute ("no_profile_instrument_function",
+				 DECL_ATTRIBUTES (callee->decl)) == NULL_TREE))
+    {
+      cgraph_node *origin = caller;
+      while (origin->clone_of)
+	origin = origin->clone_of;
+
+      if (!DECL_STRUCT_FUNCTION (origin->decl)->always_inline_functions_inlined)
+	{
+	  e->inline_failed = CIF_UNSPECIFIED;
+	  inlinable = false;
+	}
+    }
+
   if (!inlinable && report)
     report_inline_failed_reason (e);
   return inlinable;
diff --git a/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-2.c b/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-2.c
new file mode 100644
index 00000000000..472eca88efd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-2.c
@@ -0,0 +1,15 @@
+/* { dg-require-effective-target global_constructor } */
+/* { dg-options "-O2 -fprofile-generate -fprofile-update=single -fdump-tree-optimized" } */
+
+__attribute__ ((no_profile_instrument_function))
+int foo()
+{
+  return 0;
+}
+
+int bar()
+{
+  return foo();
+}
+
+/* { dg-final { scan-tree-dump-not" = foo \\(\\)" "optimized"} } */