ifcvt.c (noce_emit_cmove, [...]): Allow CC mode if HAVE_cbranchcc4.

2014-11-03  Zhenqiang Chen  <zhenqiang.chen@arm.com>

	* ifcvt.c (noce_emit_cmove, noce_get_alt_condition, noce_get_condition):
	Allow CC mode if HAVE_cbranchcc4.

From-SVN: r217026

gcc/ChangeLog

+2014-11-03  Zhenqiang Chen  <zhenqiang.chen@arm.com>
+
+	* ifcvt.c (noce_emit_cmove, noce_get_alt_condition, noce_get_condition):
+	Allow CC mode if HAVE_cbranchcc4.
+
 2014-11-02  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* config/arc/arc.c (write_ext_corereg_1): Delete.

gcc/ifcvt.c

@@ -1448,10 +1448,17 @@ noce_emit_cmove (struct noce_if_info *if_info, rtx x, enum rtx_code code,
       end_sequence ();
     }
 
-  /* Don't even try if the comparison operands are weird.  */
+  /* Don't even try if the comparison operands are weird
+     except that the target supports cbranchcc4.  */
   if (! general_operand (cmp_a, GET_MODE (cmp_a))
       || ! general_operand (cmp_b, GET_MODE (cmp_b)))
-    return NULL_RTX;
+    {
+#if HAVE_cbranchcc4
+      if (GET_MODE_CLASS (GET_MODE (cmp_a)) != MODE_CC
+	  || cmp_b != const0_rtx)
+#endif
+	return NULL_RTX;
+    }
 
 #if HAVE_conditional_move
   unsignedp = (code == LTU || code == GEU
@@ -1777,6 +1784,11 @@ noce_get_alt_condition (struct noce_if_info *if_info, rtx target,
   rtx cond, set;
   rtx_insn *insn;
   int reverse;
+  int allow_cc_mode = false;
+#if HAVE_cbranchcc4
+  allow_cc_mode = true;
+#endif
+
 
   /* If target is already mentioned in the known condition, return it.  */
   if (reg_mentioned_p (target, if_info->cond))
@@ -1898,7 +1910,7 @@ noce_get_alt_condition (struct noce_if_info *if_info, rtx target,
     }
 
   cond = canonicalize_condition (if_info->jump, cond, reverse,
-				 earliest, target, false, true);
+				 earliest, target, allow_cc_mode, true);
   if (! cond || ! reg_mentioned_p (target, cond))
     return NULL;
 
@@ -2354,6 +2366,10 @@ noce_get_condition (rtx_insn *jump, rtx_insn **earliest, bool then_else_reversed
 {
   rtx cond, set, tmp;
   bool reverse;
+  int allow_cc_mode = false;
+#if HAVE_cbranchcc4
+  allow_cc_mode = true;
+#endif
 
   if (! any_condjump_p (jump))
     return NULL_RTX;
@@ -2390,7 +2406,7 @@ noce_get_condition (rtx_insn *jump, rtx_insn **earliest, bool then_else_reversed
   /* Otherwise, fall back on canonicalize_condition to do the dirty
      work of manipulating MODE_CC values and COMPARE rtx codes.  */
   tmp = canonicalize_condition (jump, cond, reverse, earliest,
-				NULL_RTX, false, true);
+				NULL_RTX, allow_cc_mode, true);
 
   /* We don't handle side-effects in the condition, like handling
      REG_INC notes and making sure no duplicate conditions are emitted.  */