From: verwaest@chromium.org <verwaest@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Thu, 25 Jul 2013 12:22:23 +0000 (+0000)
Subject: Remove support for smi-based keyed accesses on 64bit.
X-Git-Tag: upstream/4.7.83~13204
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8e719ea4723567cb49117f205fe8bab9bb058219;p=platform%2Fupstream%2Fv8.git

Remove support for smi-based keyed accesses on 64bit.

R=mvstanton@chromium.org

Review URL: https://chromiumcodereview.appspot.com/20298002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15881 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 786ff87..bf59159 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5885,8 +5885,8 @@ class ArrayInstructionInterface {
   virtual ~ArrayInstructionInterface() { };
 
   static Representation KeyedAccessIndexRequirement(Representation r) {
-    return r.IsInteger32() ? Representation::Integer32()
-                           : Representation::Smi();
+    return r.IsInteger32() || kSmiValueSize != 31
+        ? Representation::Integer32() : Representation::Smi();
   }
 };
 
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 2378f2b..364c3a1 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2897,9 +2897,7 @@ void LCodeGen::DoLoadKeyedExternalArray(LLoadKeyed* instr) {
     // gets replaced during bound check elimination with the index argument
     // to the bounds check, which can be tagged, so that case must be
     // handled here, too.
-    if (instr->hydrogen()->key()->representation().IsSmi()) {
-      __ SmiToInteger64(key_reg, key_reg);
-    } else if (instr->hydrogen()->IsDehoisted()) {
+    if (instr->hydrogen()->IsDehoisted()) {
       // Sign extend key because it could be a 32 bit negative value
       // and the dehoisted address computation happens in 64 bits
       __ movsxlq(key_reg, key_reg);
@@ -2970,9 +2968,7 @@ void LCodeGen::DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr) {
     // representation for the key to be an integer, the input gets replaced
     // during bound check elimination with the index argument to the bounds
     // check, which can be tagged, so that case must be handled here, too.
-    if (instr->hydrogen()->key()->representation().IsSmi()) {
-      __ SmiToInteger64(key_reg, key_reg);
-    } else if (instr->hydrogen()->IsDehoisted()) {
+    if (instr->hydrogen()->IsDehoisted()) {
       // Sign extend key because it could be a 32 bit negative value
       // and the dehoisted address computation happens in 64 bits
       __ movsxlq(key_reg, key_reg);
@@ -3012,9 +3008,7 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
     // gets replaced during bound check elimination with the index
     // argument to the bounds check, which can be tagged, so that
     // case must be handled here, too.
-    if (instr->hydrogen()->key()->representation().IsSmi()) {
-      __ SmiToInteger64(key_reg, key_reg);
-    } else if (instr->hydrogen()->IsDehoisted()) {
+    if (instr->hydrogen()->IsDehoisted()) {
       // Sign extend key because it could be a 32 bit negative value
       // and the dehoisted address computation happens in 64 bits
       __ movsxlq(key_reg, key_reg);
@@ -4090,9 +4084,7 @@ void LCodeGen::DoStoreKeyedExternalArray(LStoreKeyed* instr) {
     // gets replaced during bound check elimination with the index
     // argument to the bounds check, which can be tagged, so that case
     // must be handled here, too.
-    if (instr->hydrogen()->key()->representation().IsSmi()) {
-      __ SmiToInteger64(key_reg, key_reg);
-    } else if (instr->hydrogen()->IsDehoisted()) {
+    if (instr->hydrogen()->IsDehoisted()) {
       // Sign extend key because it could be a 32 bit negative value
       // and the dehoisted address computation happens in 64 bits
       __ movsxlq(key_reg, key_reg);
@@ -4154,9 +4146,7 @@ void LCodeGen::DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr) {
     // input gets replaced during bound check elimination with the index
     // argument to the bounds check, which can be tagged, so that case
     // must be handled here, too.
-    if (instr->hydrogen()->key()->representation().IsSmi()) {
-      __ SmiToInteger64(key_reg, key_reg);
-    } else if (instr->hydrogen()->IsDehoisted()) {
+    if (instr->hydrogen()->IsDehoisted()) {
       // Sign extend key because it could be a 32 bit negative value
       // and the dehoisted address computation happens in 64 bits
       __ movsxlq(key_reg, key_reg);
@@ -4197,9 +4187,7 @@ void LCodeGen::DoStoreKeyedFixedArray(LStoreKeyed* instr) {
     // input gets replaced during bound check elimination with the index
     // argument to the bounds check, which can be tagged, so that case
     // must be handled here, too.
-    if (instr->hydrogen()->key()->representation().IsSmi()) {
-      __ SmiToInteger64(key_reg, key_reg);
-    } else if (instr->hydrogen()->IsDehoisted()) {
+    if (instr->hydrogen()->IsDehoisted()) {
       // Sign extend key because it could be a 32 bit negative value
       // and the dehoisted address computation happens in 64 bits
       __ movsxlq(key_reg, key_reg);
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index c1d81c0..d6f05c0 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2118,13 +2118,9 @@ LInstruction* LChunkBuilder::DoLoadExternalArrayPointer(
 
 
 LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
-  ASSERT(instr->key()->representation().IsInteger32() ||
-         instr->key()->representation().IsSmi());
+  ASSERT(instr->key()->representation().IsInteger32());
   ElementsKind elements_kind = instr->elements_kind();
-  bool clobbers_key = instr->key()->representation().IsSmi();
-  LOperand* key = clobbers_key
-      ? UseTempRegister(instr->key())
-      : UseRegisterOrConstantAtStart(instr->key());
+  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LLoadKeyed* result = NULL;
 
   if (!instr->is_external()) {
@@ -2162,7 +2158,6 @@ LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
 
 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
   ElementsKind elements_kind = instr->elements_kind();
-  bool clobbers_key = instr->key()->representation().IsSmi();
 
   if (!instr->is_external()) {
     ASSERT(instr->elements()->representation().IsTagged());
@@ -2174,8 +2169,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
     if (instr->value()->representation().IsDouble()) {
       object = UseRegisterAtStart(instr->elements());
       val = UseTempRegister(instr->value());
-      key = clobbers_key ? UseTempRegister(instr->key())
-          : UseRegisterOrConstantAtStart(instr->key());
+      key = UseRegisterOrConstantAtStart(instr->key());
     } else {
       ASSERT(instr->value()->representation().IsSmiOrTagged());
       object = UseTempRegister(instr->elements());
@@ -2184,12 +2178,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
         key = UseTempRegister(instr->key());
       } else {
         val = UseRegisterOrConstantAtStart(instr->value());
-
-        if (clobbers_key) {
-          key = UseTempRegister(instr->key());
-        } else {
-          key = UseRegisterOrConstantAtStart(instr->key());
-        }
+        key = UseRegisterOrConstantAtStart(instr->key());
       }
     }
 
@@ -2209,8 +2198,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       elements_kind == EXTERNAL_FLOAT_ELEMENTS;
   LOperand* val = val_is_temp_register ? UseTempRegister(instr->value())
       : UseRegister(instr->value());
-  LOperand* key = clobbers_key ? UseTempRegister(instr->key())
-      : UseRegisterOrConstantAtStart(instr->key());
+  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LOperand* external_pointer = UseRegister(instr->elements());
   return new(zone()) LStoreKeyed(external_pointer, key, val);
 }