[NDS32] Consider -mcmodel=X in nds32_legitimate_address_p implementation.

gcc/
	* config/nds32/nds32.c (nds32_legitimate_address_p): Consider
	TARGET_CMODEL_LARGE and TARGET_CMODEL_MEDIUM cases.

From-SVN: r219515

gcc/ChangeLog

 2015-01-13  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32.c (nds32_legitimate_address_p): Consider
+	TARGET_CMODEL_LARGE and TARGET_CMODEL_MEDIUM cases.
+
+2015-01-13  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* config/nds32/nds32.h (NDS32_SYMBOL_FLAG_RODATA): Define our own
 	target-specific symbol_ref flag.
 	(NDS32_SYMBOL_REF_RODATA_P): Define it to check if the symbol_ref

gcc/config/nds32/nds32.c

@@ -1961,24 +1961,27 @@ nds32_legitimate_address_p (machine_mode mode, rtx x, bool strict)
       return nds32_address_register_rtx_p (x, strict);
 
     case SYMBOL_REF:
-
-      if (!TARGET_GP_DIRECT
+      /* (mem (symbol_ref A)) => [symbol_ref] */
+      /* If -mcmodel=large, the 'symbol_ref' is not a valid address
+         during or after LRA/reload phase.  */
+      if (TARGET_CMODEL_LARGE
 	  && (reload_completed
 	      || reload_in_progress
 	      || lra_in_progress))
 	return false;
-
-      /* (mem (symbol_ref A)) => [symbol_ref] */
-      return !currently_expanding_to_rtl;
-
-    case CONST:
-
-      if (!TARGET_GP_DIRECT
+      /* If -mcmodel=medium and the symbol references to rodata section,
+         the 'symbol_ref' is not a valid address during or after
+         LRA/reload phase.  */
+      if (TARGET_CMODEL_MEDIUM
+	  && NDS32_SYMBOL_REF_RODATA_P (x)
 	  && (reload_completed
 	      || reload_in_progress
 	      || lra_in_progress))
 	return false;
 
+      return true;
+
+    case CONST:
       /* (mem (const (...)))
          => [ + const_addr ], where const_addr = symbol_ref + const_int */
       if (GET_CODE (XEXP (x, 0)) == PLUS)
@@ -1989,9 +1992,30 @@ nds32_legitimate_address_p (machine_mode mode, rtx x, bool strict)
 	  rtx op1 = XEXP (plus_op, 1);
 
 	  if (GET_CODE (op0) == SYMBOL_REF && CONST_INT_P (op1))
-	    return true;
-	  else
-	    return false;
+	    {
+	      /* Now we see the [ + const_addr ] pattern, but we need
+	         some further checking.  */
+	      /* If -mcmodel=large, the 'const_addr' is not a valid address
+	         during or after LRA/reload phase.  */
+	      if (TARGET_CMODEL_LARGE
+		  && (reload_completed
+		      || reload_in_progress
+		      || lra_in_progress))
+		return false;
+	      /* If -mcmodel=medium and the symbol references to rodata section,
+	         the 'const_addr' is not a valid address during or after
+	         LRA/reload phase.  */
+	      if (TARGET_CMODEL_MEDIUM
+		  && NDS32_SYMBOL_REF_RODATA_P (op0)
+		  && (reload_completed
+		      || reload_in_progress
+		      || lra_in_progress))
+		return false;
+
+	      /* At this point we can make sure 'const_addr' is a
+		 valid address.  */
+	      return true;
+	    }
 	}
 
 	return false;