* Function Entry::
* Profiling::
* Inlining::
+* Tail Calling::
@end menu
@node Frame Layout
return non-zero if the function can be inlined, otherwise it should
return 0.
+@node Tail Calling
+@subsection Permitting tail calls to functions
+@cindex tail calls
+@cindex sibling calls
+
+@table @code
+@findex FUNCTION_OK_FOR_SIBCALL
+@item FUNCTION_OK_FOR_SIBCALL (@var{decl})
+A C expression that evaluates to true if it is ok to perform a sibling
+call to @var{decl}.
+
+It is not uncommon for limitations of calling conventions to prevent
+tail calls to functions outside the current unit of translation, or
+during PIC compilation. Use this macro to enforce these restrictions,
+as the @code{sibcall} md pattern can not fail, or fall over to a
+``normal'' call.
+@end table
+
@node Varargs
@section Implementing the Varargs Macros
@cindex varargs implementation