This patch makes MicroBlaze handle return and simple_return in
the same fashion as MIPS.
2011-12-29 Michael Eager <ea...@eagercon.com>
* config/microblaze/microblaze.md: Add expander for simple_return,
return, add return_internal and simple_return_internal insns.
Checked in, revision 182725.
--
Michael Eager ea...@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306 650-325-8077
Index: config/microblaze/microblaze.md
===================================================================
--- config/microblaze/microblaze.md (revision 182723)
+++ config/microblaze/microblaze.md (working copy)
@@ -82,6 +82,13 @@
;; # instructions (4 bytes each)
(define_attr "length" "" (const_int 4))
+(define_code_iterator any_return [return simple_return])
+
+;; <optab> expands to the name of the optab for a particular code.
+(define_code_attr optab [(return "return")
+ (simple_return "simple_return")])
+
+
;;----------------------------------------------------
;; Attribute describing the processor.
;;----------------------------------------------------
@@ -1936,9 +1943,21 @@
;; Trivial return. Make it look like a normal return insn as that
;; allows jump optimizations to work better .
-(define_insn "return"
- [(return)]
+(define_expand "return"
+ [(simple_return)]
"microblaze_can_use_return_insn ()"
+ {}
+)
+
+(define_expand "simple_return"
+ [(simple_return)]
+ ""
+ {}
+)
+
+(define_insn "*<optab>"
+ [(any_return)]
+ ""
{
if (microblaze_is_interrupt_handler ())
return "rtid\tr14, 0\;%#";
@@ -1947,15 +1966,14 @@
}
[(set_attr "type" "jump")
(set_attr "mode" "none")
- (set_attr "length" "4")])
+ (set_attr "length" "4")]
+)
;; Normal return.
-;; We match any mode for the return address, so that this will work with
-;; both 32 bit and 64 bit targets.
-(define_insn "return_internal"
- [(parallel [(use (match_operand:SI 0 "register_operand" ""))
- (return)])]
+(define_insn "<optab>_internal"
+ [(any_return)
+ (use (match_operand:SI 0 "register_operand" ""))]
""
{
if (microblaze_is_interrupt_handler ())
