From 3b5256b352a4c53776ea2ddc28001e617326b838 Mon Sep 17 00:00:00 2001
From: "ricow@chromium.org"
 <ricow@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 2 Mar 2011 10:12:33 +0000
Subject: [PATCH] X64: implement DoHasCachedArrayIndex in lithium compiler.

Review URL: http://codereview.chromium.org/6596104

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7015 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/x64/lithium-codegen-x64.cc | 12 +++++++++++-
 src/x64/lithium-x64.cc         |  5 +++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index d281c2f..0ae8a00 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1632,7 +1632,17 @@ void LCodeGen::DoHasInstanceTypeAndBranch(LHasInstanceTypeAndBranch* instr) {
 
 
 void LCodeGen::DoHasCachedArrayIndex(LHasCachedArrayIndex* instr) {
-  Abort("Unimplemented: %s", "DoHasCachedArrayIndex");
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+
+  ASSERT(instr->hydrogen()->value()->representation().IsTagged());
+  __ LoadRoot(result, Heap::kTrueValueRootIndex);
+  __ testl(FieldOperand(input, String::kHashFieldOffset),
+           Immediate(String::kContainsCachedArrayIndexMask));
+  NearLabel done;
+  __ j(not_zero, &done);
+  __ LoadRoot(result, Heap::kFalseValueRootIndex);
+  __ bind(&done);
 }
 
 
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index f0ab11e..18b38e2 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1531,8 +1531,9 @@ LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
 
 LInstruction* LChunkBuilder::DoHasCachedArrayIndex(
     HHasCachedArrayIndex* instr) {
-  Abort("Unimplemented: %s", "DoHasCachedArrayIndex");
-  return NULL;
+  ASSERT(instr->value()->representation().IsTagged());
+  LOperand* value = UseRegister(instr->value());
+  return DefineAsRegister(new LHasCachedArrayIndex(value));
 }
 
 
-- 
2.7.4