re PR target/35695 (-funroll-loops breaks inline float divide)

PR target/35695
* config/ia64/div.md (recip_approx_rf): Use UNSPEC not DIV.
* config/ia64/ia64.c (rtx_needs_barrier): Handle
UNSPEC_FR_RECIP_APPROX_RES.
* config/ia64/ia64.md (UNSPEC_FR_RECIP_APPROX_RES): Define.

From-SVN: r133772

gcc/ChangeLog

+2008-03-31  James E. Wilson  <wilson@tuliptree.org>
+
+	PR target/35695
+	* config/ia64/div.md (recip_approx_rf): Use UNSPEC not DIV.
+	* config/ia64/ia64.c (rtx_needs_barrier): Handle
+	UNSPEC_FR_RECIP_APPROX_RES.
+	* config/ia64/ia64.md (UNSPEC_FR_RECIP_APPROX_RES): Define.
+
 2008-03-31  Volker Reichelt  <v.reichelt@netcologne.de>
 
 	PR c/35750

gcc/config/ia64/div.md

@@ -199,8 +199,9 @@
 
 (define_insn "recip_approx_rf"
   [(set (match_operand:RF 0 "fr_register_operand" "=f")
-        (div:RF (match_operand:RF 1 "fr_register_operand" "f")
-                (match_operand:RF 2 "fr_register_operand" "f")))
+        (unspec:RF [(match_operand:RF 1 "fr_register_operand" "f")
+		    (match_operand:RF 2 "fr_register_operand" "f")]
+		   UNSPEC_FR_RECIP_APPROX_RES))
    (set (match_operand:BI 3 "register_operand" "=c")
         (unspec:BI [(match_dup 1) (match_dup 2)] UNSPEC_FR_RECIP_APPROX))
    (use (match_operand:SI 4 "const_int_operand" ""))]

gcc/config/ia64/ia64.c

@@ -5898,6 +5898,7 @@ rtx_needs_barrier (rtx x, struct reg_flags flags, int pred)
 	case UNSPEC_FR_RECIP_APPROX:
 	case UNSPEC_SHRP:
 	case UNSPEC_COPYSIGN:
+	case UNSPEC_FR_RECIP_APPROX_RES:
 	  need_barrier = rtx_needs_barrier (XVECEXP (x, 0, 0), flags, pred);
 	  need_barrier |= rtx_needs_barrier (XVECEXP (x, 0, 1), flags, pred);
 	  break;

gcc/config/ia64/ia64.md

@@ -86,6 +86,7 @@
    (UNSPEC_LDCCLR               43)
    (UNSPEC_CHKACLR              45)
    (UNSPEC_CHKS                 47)	
+   (UNSPEC_FR_RECIP_APPROX_RES  48)
   ])
 
 (define_constants