Fix PR58332

[Jan Hubicka <hubicka at ucw dot cz>]

Hi,
this patch makes inliner to not inline functions with -O0 optimization attribute
and also to not inline into functions.

Bootstrapped/regtested x86_64-linux, comitted.
	PR middle-end/58332
	* gcc.c-torture/compile/pr58332.c: New testcase.
	* cif-code.def (FUNCTION_NOT_OPTIMIZED): New CIF code.
	* ipa-inline.c (can_inline_edge_p): Do not downgrade
	FUNCTION_NOT_OPTIMIZED.
	* ipa-inline-analysis.c (compute_inline_parameters): Function
	not optimized is not inlinable unless it is alwaysinline.
	(inline_analyze_function): Force calls in not optimized
	function not inlinable.

Index: testsuite/gcc.c-torture/compile/pr58332.c
===================================================================
--- testsuite/gcc.c-torture/compile/pr58332.c	(revision 0)
+++ testsuite/gcc.c-torture/compile/pr58332.c	(revision 0)
@@ -0,0 +1,2 @@
+static inline int foo (int x) { return x + 1; }
+__attribute__ ((__optimize__ (0))) int bar (void) { return foo (100); }
Index: cif-code.def
===================================================================
--- cif-code.def	(revision 202656)
+++ cif-code.def	(working copy)
@@ -37,6 +37,9 @@ DEFCIFCODE(UNSPECIFIED , "")
    functions that have not been rejected for inlining yet.  */
 DEFCIFCODE(FUNCTION_NOT_CONSIDERED, N_("function not considered for inlining"))
 
+/* Caller is compiled with optimizations disabled.  */
+DEFCIFCODE(FUNCTION_NOT_OPTIMIZED, N_("caller is not optimized"))
+
 /* Inlining failed owing to unavailable function body.  */
 DEFCIFCODE(BODY_NOT_AVAILABLE, N_("function body not available"))
 
Index: ipa-inline.c
===================================================================
--- ipa-inline.c	(revision 202656)
+++ ipa-inline.c	(working copy)
@@ -275,7 +275,8 @@ can_inline_edge_p (struct cgraph_edge *e
     }
   else if (e->call_stmt_cannot_inline_p)
     {
-      e->inline_failed = CIF_MISMATCHED_ARGUMENTS;
+      if (e->inline_failed != CIF_FUNCTION_NOT_OPTIMIZED)
+        e->inline_failed = CIF_MISMATCHED_ARGUMENTS;
       inlinable = false;
     }
   /* Don't inline if the functions have different EH personalities.  */
Index: ipa-inline-analysis.c
===================================================================
--- ipa-inline-analysis.c	(revision 202656)
+++ ipa-inline-analysis.c	(working copy)
@@ -2664,7 +2664,11 @@ compute_inline_parameters (struct cgraph
   info->stack_frame_offset = 0;
 
   /* Can this function be inlined at all?  */
-  info->inlinable = tree_inlinable_function_p (node->symbol.decl);
+  if (!optimize && !lookup_attribute ("always_inline",
+				      DECL_ATTRIBUTES (node->symbol.decl)))
+    info->inlinable = false;
+  else
+    info->inlinable = tree_inlinable_function_p (node->symbol.decl);
 
   /* Type attributes can use parameter indices to describe them.  */
   if (TYPE_ATTRIBUTES (TREE_TYPE (node->symbol.decl)))
@@ -3678,6 +3682,22 @@ inline_analyze_function (struct cgraph_n
   if (optimize && !node->thunk.thunk_p)
     inline_indirect_intraprocedural_analysis (node);
   compute_inline_parameters (node, false);
+  if (!optimize)
+    {
+      struct cgraph_edge *e;
+      for (e = node->callees; e; e = e->next_callee)
+	{
+	  if (e->inline_failed == CIF_FUNCTION_NOT_CONSIDERED)
+	    e->inline_failed = CIF_FUNCTION_NOT_OPTIMIZED;
+	  e->call_stmt_cannot_inline_p = true;
+	}
+      for (e = node->indirect_calls; e; e = e->next_callee)
+	{
+	  if (e->inline_failed == CIF_FUNCTION_NOT_CONSIDERED)
+	    e->inline_failed = CIF_FUNCTION_NOT_OPTIMIZED;
+	  e->call_stmt_cannot_inline_p = true;
+	}
+    }
 
   pop_cfun ();
 }