From ecadc63b60ae657118de2639d22d9c97778fea08 Mon Sep 17 00:00:00 2001
From: "bmeurer@chromium.org"
 <bmeurer@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Mon, 19 May 2014 07:08:47 +0000
Subject: [PATCH] Partial revert of "Next bunch of fixes for check
 elimination".

This reverts the part of r21154 that introduced the CHECK()s to verify
state of objects with stable maps during code generation. The CHECK()s
seem to trigger a non-critical hidden bug in the map stability
mechanism. We will re-add these CHECK()s once the bug is found and
fixed.

BUG=372173
LOG=y
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/287363002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21352 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/arm/lithium-codegen-arm.cc     | 7 -------
 src/arm64/lithium-codegen-arm64.cc | 7 -------
 src/ia32/lithium-codegen-ia32.cc   | 7 -------
 src/mips/lithium-codegen-mips.cc   | 7 -------
 src/x64/lithium-codegen-x64.cc     | 7 -------
 5 files changed, 35 deletions(-)

diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 0b9411b..1fd4405 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1884,13 +1884,6 @@ void LCodeGen::DoConstantE(LConstantE* instr) {
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ Move(ToRegister(instr->result()), object);
 }
 
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index e35806a..5be55d7 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -2561,13 +2561,6 @@ void LCodeGen::DoConstantS(LConstantS* instr) {
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ LoadObject(ToRegister(instr->result()), object);
 }
 
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 159fd3d..f4bf601 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1749,13 +1749,6 @@ void LCodeGen::DoConstantT(LConstantT* instr) {
   Register reg = ToRegister(instr->result());
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ LoadObject(reg, object);
 }
 
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index d33cbb1..ba03e16 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1739,13 +1739,6 @@ void LCodeGen::DoConstantE(LConstantE* instr) {
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ li(ToRegister(instr->result()), object);
 }
 
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index c928523..2d34056 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1697,13 +1697,6 @@ void LCodeGen::DoConstantE(LConstantE* instr) {
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ Move(ToRegister(instr->result()), object);
 }
 
-- 
2.7.4