ia64.md: Define new attribute "empty".

	* config/ia64/ia64.md: Define new attribute "empty".
	(prologue_use, nop_x, insn_group_barrier): Set it.

	* config/ia64/ia64.c (ia64_reorg): When looking for trailing call
	skip over "empty" insns.

From-SVN: r84059

gcc/ChangeLog

+2004-07-03  Andreas Schwab  <schwab@suse.de>
+
+	* config/ia64/ia64.md: Define new attribute "empty".
+	(prologue_use, nop_x, insn_group_barrier): Set it.
+
+	* config/ia64/ia64.c (ia64_reorg): When looking for trailing call
+	skip over "empty" insns.
+
 2004-07-03  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
 	* tree-inline.c (initialize_inlined_parameters): Pass proper function

gcc/config/ia64/ia64.c

@@ -7666,11 +7666,12 @@ ia64_reorg (void)
       insn = get_last_insn ();
       if (! INSN_P (insn))
         insn = prev_active_insn (insn);
-      if (GET_CODE (insn) == INSN
-	  && GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE
-	  && XINT (PATTERN (insn), 1) == UNSPECV_INSN_GROUP_BARRIER)
-	{
-	  saw_stop = 1;
+      /* Skip over insns that expand to nothing.  */
+      while (GET_CODE (insn) == INSN && get_attr_empty (insn) == EMPTY_YES)
+        {
+	  if (GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE
+	      && XINT (PATTERN (insn), 1) == UNSPECV_INSN_GROUP_BARRIER)
+	    saw_stop = 1;
 	  insn = prev_active_insn (insn);
 	}
       if (GET_CODE (insn) == CALL_INSN)

gcc/config/ia64/ia64.md

@@ -154,6 +154,10 @@
 
 (define_attr "predicable" "no,yes" (const_string "yes"))
 
+;; Empty.  True iff this insn does not generate any code.
+
+(define_attr "empty" "no,yes" (const_string "no"))
+
 
 
 ;; DFA descriptions of ia64 processors used for insn scheduling and
@@ -5425,7 +5429,8 @@
   ""
   ""
   [(set_attr "itanium_class" "ignore")
-   (set_attr "predicable" "no")])
+   (set_attr "predicable" "no")
+   (set_attr "empty" "yes")])
 
 ;; Allocate a new register frame.
 
@@ -5592,7 +5597,8 @@
   [(const_int 5)]
   ""
   ""
-  [(set_attr "itanium_class" "nop_x")])
+  [(set_attr "itanium_class" "nop_x")
+   (set_attr "empty" "yes")])
 
 ;; The following insn will be never generated.  It is used only by
 ;; insn scheduler to change state before advancing cycle.
@@ -5624,7 +5630,8 @@
   ""
   ";;"
   [(set_attr "itanium_class" "stop_bit")
-   (set_attr "predicable" "no")])
+   (set_attr "predicable" "no")
+   (set_attr "empty" "yes")])
 
 (define_expand "trap"
   [(trap_if (const_int 1) (const_int 0))]