Add optimized loads from ExternalUint8ClampedArrays.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 952 matching lines @@
     case kArrayCid:
     case kImmutableArrayCid:
       return kDynamicCid;
     case kFloat32ArrayCid :
     case kFloat64ArrayCid :
       return kDoubleCid;
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
     case kExternalUint8ArrayCid:
+    case kExternalUint8ClampedArrayCid:
     case kInt16ArrayCid:
     case kUint16ArrayCid:
     case kOneByteStringCid:
     case kTwoByteStringCid:
     case kInt32ArrayCid:
     case kUint32ArrayCid:
       return kSmiCid;
     default:
       UNIMPLEMENTED();
       return kSmiCid;
   }
 }
 
 
 Representation LoadIndexedInstr::representation() const {
   switch (class_id_) {
     case kArrayCid:
     case kImmutableArrayCid:
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
     case kExternalUint8ArrayCid:
+    case kExternalUint8ClampedArrayCid:
     case kInt16ArrayCid:
     case kUint16ArrayCid:
     case kOneByteStringCid:
     case kTwoByteStringCid:
     case kInt32ArrayCid:
     case kUint32ArrayCid:
       return kTagged;
     case kFloat32ArrayCid :
     case kFloat64ArrayCid :
       return kUnboxedDouble;
@@ skipping 22 matching lines @@
     locs->set_out(Location::RequiresRegister());
   }
   return locs;
 }
 
 
 void LoadIndexedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register array = locs()->in(0).reg();
   Location index = locs()->in(1);
 
-  if (class_id() == kExternalUint8ArrayCid) {
+  if ((class_id() == kExternalUint8ArrayCid) ||
+      (class_id() == kExternalUint8ClampedArrayCid)) {
     Register result = locs()->out().reg();
     Address element_address = index.IsRegister()
         ? FlowGraphCompiler::ExternalElementAddressForRegIndex(
             class_id(), index_scale(), result, index.reg())
         : FlowGraphCompiler::ExternalElementAddressForIntIndex(
             class_id(), index_scale(), result,
             Smi::Cast(index.constant()).Value());
     ASSERT(index_scale() == 1);
     if (index.IsRegister()) {
       __ SmiUntag(index.reg());
     }
     __ movq(result,
             FieldAddress(array, ExternalUint8Array::data_offset()));
     __ movzxb(result, element_address);
     __ SmiTag(result);
     if (index.IsRegister()) {
       __ SmiTag(index.reg());  // Re-tag.
     }
     return;
   }
 
   FieldAddress element_address = index.IsRegister()
       ? FlowGraphCompiler::ElementAddressForRegIndex(
           class_id(), index_scale(), array, index.reg())
       : FlowGraphCompiler::ElementAddressForIntIndex(
           class_id(), index_scale(), array,
           Smi::Cast(index.constant()).Value());
 
   if (representation() == kUnboxedDouble) {
-    if (index_scale() == 1 && index.IsRegister()) {
+    if ((index_scale() == 1) && index.IsRegister()) {
       __ SmiUntag(index.reg());
     }
 
     XmmRegister result = locs()->out().fpu_reg();
     if (class_id() == kFloat32ArrayCid) {
       // Load single precision float.
       __ movss(result, element_address);
       // Promote to double.
       __ cvtss2sd(result, locs()->out().fpu_reg());
     } else {
       ASSERT(class_id() == kFloat64ArrayCid);
       __ movsd(result, element_address);
     }
 
-    if (index_scale() == 1 && index.IsRegister()) {
+    if ((index_scale() == 1) && index.IsRegister()) {
         __ SmiTag(index.reg());  // Re-tag.
     }
     return;
   }
 
-  if (index_scale() == 1 && index.IsRegister()) {
+  if ((index_scale() == 1) && index.IsRegister()) {
     __ SmiUntag(index.reg());
   }
   Register result = locs()->out().reg();
   switch (class_id()) {
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
     case kOneByteStringCid:
       if (class_id() == kInt8ArrayCid) {
         __ movsxb(result, element_address);
@@ skipping 17 matching lines @@
       break;
     case kUint32ArrayCid:
       __ movl(result, element_address);
       __ SmiTag(result);
       break;
     default:
       ASSERT((class_id() == kArrayCid) || (class_id() == kImmutableArrayCid));
       __ movq(result, element_address);
       break;
   }
-  if (index_scale() == 1 && index.IsRegister()) {
+  if ((index_scale() == 1) && index.IsRegister()) {
       __ SmiTag(index.reg());  // Re-tag.
   }
 }
 
 
 Representation StoreIndexedInstr::RequiredInputRepresentation(
     intptr_t idx) const {
   if ((idx == 0) || (idx == 1)) return kTagged;
   ASSERT(idx == 2);
   switch (class_id_) {
@@ skipping 1903 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64