Patches to fix minor optimizer bugs

Patches to fix minor optimizer bugs
	* expmed.c (extract_bit_field): Don't make flag_force_mem disable
	extzv for memory operands.
	* cse.c (simplify_ternary_operation, case IF_THEN_ELSE): Collapse
	redundant conditional moves to single operand.

From-SVN: r16129

gcc/ChangeLog

+Mon Oct 20 16:47:08 1997  Jim Wilson  <wilson@cygnus.com>
+
+	* expmed.c (extract_bit_field): Don't make flag_force_mem disable
+	extzv for memory operands.
+
+	* cse.c (simplify_ternary_operation, case IF_THEN_ELSE): Collapse
+	redundant conditional moves to single operand.
+
 Mon Oct 20 15:30:26 1997  Nick Clifton  <nickc@cygnus.com>
 
 	* v850.h: Move define of __v850__ from CPP_PREDEFINES

gcc/cse.c

@@ -4669,6 +4669,16 @@ simplify_ternary_operation (code, mode, op0_mode, op0, op1, op2)
     case IF_THEN_ELSE:
       if (GET_CODE (op0) == CONST_INT)
 	return op0 != const0_rtx ? op1 : op2;
+
+      /* Convert a == b ? b : a to "a".  */
+      if (GET_CODE (op0) == NE && ! side_effects_p (op0)
+	  && rtx_equal_p (XEXP (op0, 0), op1)
+	  && rtx_equal_p (XEXP (op0, 1), op2))
+	return op1;
+      else if (GET_CODE (op0) == EQ && ! side_effects_p (op0)
+	  && rtx_equal_p (XEXP (op0, 1), op1)
+	  && rtx_equal_p (XEXP (op0, 0), op2))
+	return op2;
       break;
 
     default:

gcc/expmed.c

@@ -1084,9 +1084,8 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
 	      volatile_ok = 1;
 
 	      /* Is the memory operand acceptable?  */
-	      if (flag_force_mem
-		  || ! ((*insn_operand_predicate[(int) CODE_FOR_extzv][1])
-			(xop0, GET_MODE (xop0))))
+	      if (! ((*insn_operand_predicate[(int) CODE_FOR_extzv][1])
+		     (xop0, GET_MODE (xop0))))
 		{
 		  /* No, load into a reg and extract from there.  */
 		  enum machine_mode bestmode;