[NDS32] Define LOGICAL_OP_NON_SHORT_CIRCUIT.

gcc/
	* config/nds32/nds32.h (LOGICAL_OP_NON_SHORT_CIRCUIT): Define.

From-SVN: r258628

gcc/ChangeLog

 2018-03-18  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32.h (LOGICAL_OP_NON_SHORT_CIRCUIT): Define.
+
+2018-03-18  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* config/nds32/nds32.h (CLZ_DEFINED_VALUE_AT_ZERO): Define.
 
 2018-03-17  Chung-Ju Wu  <jasonwucj@gmail.com>

gcc/config/nds32/nds32.h

@@ -867,6 +867,10 @@ enum reg_class
    other values are interpreted relative to that.  */
 #define BRANCH_COST(speed_p, predictable_p) ((speed_p) ? 2 : 0)
 
+/* Override BRANCH_COST heuristic which empirically produces worse
+   performance for removing short circuiting from the logical ops.  */
+#define LOGICAL_OP_NON_SHORT_CIRCUIT 0
+
 #define SLOW_BYTE_ACCESS 1
 
 #define NO_FUNCTION_CSE 1