Define FUNCTION_ATTRIBUTE_INLINABLE_P, a target macro to allow functions with

target specific attributes to be inlined.

From-SVN: r33421

gcc/ChangeLog

+2000-04-25  Nick Clifton  <nickc@cygnus.com>
+
+	* integrate.c (FUNCTION_ATTRIBUTE_INLINABLE_P): If not
+	defined, define to return zero.
+	(function_cannot_inline_p): If a function has any target
+	specific attributes, then use the macro
+	FUNCTION_ATTRIBUTE_INLINABLE_P to allow the target to decide
+	whether it can be inlined.  If it cannot, issue a suitable
+	explanation.
+
+	* tm.texi: Add a new node 'Inlining' to document the new macro
+	FUNCTION_ATTRIBUTE_INLINABLE_P. 
+
 2000-04-25  Zack Weinberg  <zack@wolery.cumb.org>
 
 	* cpplib.h (struct cpp_buffer): Add 'mapped' flag; fix

gcc/integrate.c

@@ -62,6 +62,12 @@ extern struct obstack *function_maybepermanent_obstack;
    ? (1 + (3 * list_length (DECL_ARGUMENTS (DECL))) / 2) \
    : (8 * (8 + list_length (DECL_ARGUMENTS (DECL)))))
 #endif
+
+/* Decide whether a function with a target specific attribute 
+   attached can be inlined.  By default we disallow this.  */
+#ifndef FUNCTION_ATTRIBUTE_INLINABLE_P
+#define FUNCTION_ATTRIBUTE_INLINABLE_P(FNDECL) 0
+#endif
 
 static rtvec initialize_for_inline	PARAMS ((tree));
 static void note_modified_parmregs	PARAMS ((rtx, rtx, void *));
@@ -240,7 +246,14 @@ function_cannot_inline_p (fndecl)
   if (result && GET_CODE (result) == PARALLEL)
     return N_("inline functions not supported for this return value type");
 
-  return 0;
+  /* If the function has a target specific attribute attached to it,
+     then we assume that we should not inline it.  This can be overriden
+     by the target if it defines FUNCTION_ATTRIBUTE_INLINABLE_P.  */
+  if (DECL_MACHINE_ATTRIBUTES (fndecl)
+      && ! FUNCTION_ATTRIBUTE_INLINABLE_P (fndecl))
+    return N_("function with target specific attribute(s) cannot be inlined");
+
+  return NULL;
 }
 
 /* Map pseudo reg number into the PARM_DECL for the parm living in the reg.

gcc/tm.texi

@@ -2169,6 +2169,7 @@ This describes the stack layout and calling conventions.
 * Caller Saves::
 * Function Entry::
 * Profiling::
+* Inlining::
 @end menu
 
 @node Frame Layout
@@ -3671,6 +3672,17 @@ A C function or functions which are needed in the library to
 support block profiling.
 @end table
 
+@node Inlining
+@subsection Permitting inlining of functions with attributes
+@cindex inlining
+
+By default if a function has a target specific attribute attached to it,
+it will not be inlined.  This behaviour can be overridden if the target
+defines the @samp{FUNCTION_ATTRIBUTE_INLINABLE_P} macro.  This macro
+takes one argument, a @samp{DECL} describing the function.  It should
+return non-zero if the function can be inlined, otherwise it should
+return 0.
+
 @node Varargs
 @section Implementing the Varargs Macros
 @cindex varargs implementation