re PR target/1078 (Problems with attributes documentation)

2016-01-05  Sandra Loosemore <sandra@codesourcery.com>

	PR 1078
	gcc/
	* doc/extend.texi (MicroBlaze Function Attributes): Document
	interrupt_handler and fast_interrupt attributes.

From-SVN: r232081

gcc/ChangeLog

+2016-01-05  Sandra Loosemore <sandra@codesourcery.com>
+
+	PR 1078
+	* doc/extend.texi (MicroBlaze Function Attributes): Document
+	interrupt_handler and fast_interrupt attributes.
+
 2016-01-05  Sergei Trofimovich <siarheit@google.com>
 
 	PR other/60465

gcc/doc/extend.texi

@@ -4205,6 +4205,17 @@ the @code{rtbd} instead of @code{rtsd}.
 @smallexample
 void f () __attribute__ ((break_handler));
 @end smallexample
+
+@item interrupt_handler
+@itemx fast_interrupt 
+@cindex @code{interrupt_handler} function attribute, MicroBlaze
+@cindex @code{fast_interrupt} function attribute, MicroBlaze
+These attributes indicate that the specified function is an interrupt
+handler.  Use the @code{fast_interrupt} attribute to indicate handlers
+used in low-latency interrupt mode, and @code{interrupt_handler} for
+interrupts that do not use low-latency handlers.  In both cases, GCC
+emits appropriate prologue code and generates a return from the handler
+using @code{rtid} instead of @code{rtsd}.
 @end table
 
 @node Microsoft Windows Function Attributes