Add a combined_fn enum

I'm working on a patch series that needs to be able to treat built-in
functions and internal functions in a similar way.  This patch adds a
new enum, combined_fn, that combines the two together.  It also adds
utility functions for seeing which combined_fn (if any) is called by
a given CALL_EXPR or gcall.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.

gcc/
	* tree-core.h (internal_fn): Move immediately after the definition
	of built_in_function.
	(combined_fn): New enum.
	* tree.h (as_combined_fn, builtin_fn_p, as_builtin_fn)
	(internal_fn_p, as_internal_fn): New functions.
	(get_call_combined_fn, combined_fn_name): Declare.
	* tree.c (get_call_combined_fn): New function.
	(combined_fn_name): Likewise.
	* gimple.h (gimple_call_combined_fn): Declare.
	* gimple.c (gimple_call_combined_fn): New function.

From-SVN: r230472

1 files changed, 33 insertions, 0 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 1d770c3..29c5f4c 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -9317,6 +9317,25 @@ get_callee_fndecl (const_tree call)
   return NULL_TREE;
 }
 
+/* If CALL_EXPR CALL calls a normal built-in function or an internal function,
+   return the associated function code, otherwise return CFN_LAST.  */
+
+combined_fn
+get_call_combined_fn (const_tree call)
+{
+  /* It's invalid to call this function with anything but a CALL_EXPR.  */
+  gcc_assert (TREE_CODE (call) == CALL_EXPR);
+
+  if (!CALL_EXPR_FN (call))
+    return as_combined_fn (CALL_EXPR_IFN (call));
+
+  tree fndecl = get_callee_fndecl (call);
+  if (fndecl && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL)
+    return as_combined_fn (DECL_FUNCTION_CODE (fndecl));
+
+  return CFN_LAST;
+}
+
 #define TREE_MEM_USAGE_SPACES 40
 
 /* Print debugging information about tree nodes generated during the compile,
@@ -13866,4 +13885,18 @@ set_source_range (tree expr, source_range src_range)
   SET_EXPR_LOCATION (expr, adhoc);
 }
 
+/* Return the name of combined function FN, for debugging purposes.  */
+
+const char *
+combined_fn_name (combined_fn fn)
+{
+  if (builtin_fn_p (fn))
+    {
+      tree fndecl = builtin_decl_explicit (as_builtin_fn (fn));
+      return IDENTIFIER_POINTER (DECL_NAME (fndecl));
+    }
+  else
+    return internal_fn_name (as_internal_fn (fn));
+}
+
 #include "gt-tree.h"