simplify-rtx.c (simplify_relational_operation_1): Avoid creating zero extensions…

simplify-rtx.c (simplify_relational_operation_1): Avoid creating zero extensions of BImode operands.


	* simplify-rtx.c (simplify_relational_operation_1): Avoid creating
	zero extensions of BImode operands.  Call lowpart_subreg instead
	of gen_lowpart_common and gen_lowpart_SUBREG.

From-SVN: r94730

gcc/ChangeLog

+2005-02-07  Roger Sayle  <roger@eyesopen.com>
+
+	* simplify-rtx.c (simplify_relational_operation_1): Avoid creating
+	zero extensions of BImode operands.  Call lowpart_subreg instead
+	of gen_lowpart_common and gen_lowpart_SUBREG.
+
 2005-02-07  Nathanael Nerode  <neroden@gcc.gnu.org>
 
 	PR ada/19489

gcc/simplify-rtx.c

@@ -2886,19 +2886,12 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode,
       && op1 == const0_rtx
       && GET_MODE_CLASS (mode) == MODE_INT
       && cmp_mode != VOIDmode
+      && cmp_mode != BImode
       && nonzero_bits (op0, cmp_mode) == 1
       && STORE_FLAG_VALUE == 1)
-    {
-      rtx tmp;
-      if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (cmp_mode))
-	return simplify_gen_unary (ZERO_EXTEND, mode, op0, cmp_mode);
-      tmp = gen_lowpart_common (mode, op0);
-      if (tmp)
-	return tmp;
-      if (GET_MODE (op0) != mode)
-	return gen_lowpart_SUBREG (mode, op0);
-      return op0;
-    }
+    return GET_MODE_SIZE (mode) > GET_MODE_SIZE (cmp_mode)
+	   ? simplify_gen_unary (ZERO_EXTEND, mode, op0, cmp_mode)
+	   : lowpart_subreg (mode, op0, cmp_mode);
 
   return NULL_RTX;
 }