From: whesse@chromium.org <whesse@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Thu, 24 Jun 2010 14:22:25 +0000 (+0000)
Subject: Port optimization of comparison with a trivial LHS from ia32 to x64.
X-Git-Tag: upstream/4.7.83~21583
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=667c5e84a1c9890589c6972c6bd50067e915bed6;p=platform%2Fupstream%2Fv8.git

Port optimization of comparison with a trivial LHS from ia32 to x64.
Review URL: http://codereview.chromium.org/2868028

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4943 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/x64/codegen-x64.cc b/src/x64/codegen-x64.cc
index 105ac3d..2854785 100644
--- a/src/x64/codegen-x64.cc
+++ b/src/x64/codegen-x64.cc
@@ -3855,8 +3855,17 @@ void CodeGenerator::VisitCompareOperation(CompareOperation* node) {
     default:
       UNREACHABLE();
   }
-  Load(left);
-  Load(right);
+
+  if (left->IsTrivial()) {
+    Load(right);
+    Result right_result = frame_->Pop();
+    frame_->Push(left);
+    frame_->Push(&right_result);
+  } else {
+    Load(left);
+    Load(right);
+  }
+
   Comparison(node, cc, strict, destination());
 }