First steps towards better code generation for LBranch:

src/full-codegen.cc

Index: src/full-codegen.cc
===================================================================
--- src/full-codegen.cc	(revision 8272)
+++ src/full-codegen.cc	(working copy)
@@ -441,7 +441,7 @@
   // For simplicity we always test the accumulator register.
   __ Move(result_register(), reg);
   codegen()->PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
-  codegen()->DoTest(true_label_, false_label_, fall_through_);
+  codegen()->DoTest(this);
 }
 
 
@@ -463,7 +463,7 @@
   // For simplicity we always test the accumulator register.
   __ pop(result_register());
   codegen()->PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
-  codegen()->DoTest(true_label_, false_label_, fall_through_);
+  codegen()->DoTest(this);
 }
 
 
@@ -513,6 +513,14 @@
 }
 
 
+void FullCodeGenerator::DoTest(const TestContext* context) {
+  DoTest(context->condition(),
+         context->true_label(),
+         context->false_label(),
+         context->fall_through());
+}
+
+
 void FullCodeGenerator::VisitDeclarations(
     ZoneList<Declaration*>* declarations) {
   int length = declarations->length();
@@ -734,9 +742,9 @@
     Label discard, restore;
     PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
     if (is_logical_and) {
-      DoTest(&discard, &restore, &restore);
+      DoTest(left, &discard, &restore, &restore);
     } else {
-      DoTest(&restore, &discard, &restore);
+      DoTest(left, &restore, &discard, &restore);
     }
     __ bind(&restore);
     __ pop(result_register());
@@ -753,9 +761,9 @@
     Label discard;
     PrepareForBailoutBeforeSplit(TOS_REG, false, NULL, NULL);
     if (is_logical_and) {
-      DoTest(&discard, &done, &discard);
+      DoTest(left, &discard, &done, &discard);
     } else {
-      DoTest(&done, &discard, &discard);
+      DoTest(left, &done, &discard, &discard);
     }
     __ bind(&discard);
     __ Drop(1);