re PR target/19672 (Performance regression in simple loop code)

2005-10-18  Paolo Bonzini  <bonzini@gnu.org>

	PR #19672
	* dojump.c (do_jump): Handle TRUTH_AND_EXPR and TRUTH_OR_EXPR here.

From-SVN: r105606

1 files changed, 37 insertions, 1 deletions

diff --git a/gcc/dojump.c b/gcc/dojump.c
index 741c30a8dca..6dca9d32b57 100644
--- a/gcc/dojump.c
+++ b/gcc/dojump.c
@@ -510,6 +510,42 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
       }
       break;
 
+    case TRUTH_AND_EXPR:
+      /* High branch cost, expand as the bitwise AND of the conditions.  */
+      if (BRANCH_COST >= 4)
+	goto normal;
+
+      if (if_false_label == NULL_RTX)
+        {
+	  drop_through_label = gen_label_rtx ();
+          do_jump (TREE_OPERAND (exp, 0), drop_through_label, NULL_RTX);
+          do_jump (TREE_OPERAND (exp, 1), NULL_RTX, if_true_label);
+	}
+      else
+	{
+	  do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX);
+          do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
+	}
+      break;
+
+    case TRUTH_OR_EXPR:
+      /* High branch cost, expand as the bitwise OR of the conditions.  */
+      if (BRANCH_COST >= 4)
+	goto normal;
+
+      if (if_true_label == NULL_RTX)
+	{
+          drop_through_label = gen_label_rtx ();
+          do_jump (TREE_OPERAND (exp, 0), NULL_RTX, drop_through_label);
+          do_jump (TREE_OPERAND (exp, 1), if_false_label, NULL_RTX);
+	}
+      else
+	{
+          do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label);
+          do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
+	}
+      break;
+
       /* Special case:
           __builtin_expect (<test>, 0)	and
           __builtin_expect (<test>, 1)
@@ -540,8 +576,8 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
 	      }
 	  }
       }
+ 
       /* Fall through and generate the normal code.  */
-
     default:
     normal:
       temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);