Intrinsify Uint8ClampedArray's store and load indexed, inline load indexed.

runtime/vm/intrinsifier_x64.cc

 // Copyright (c) 2012, 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/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 501 matching lines @@
   // Check that value is a byte.
   __ cmpq(RDI, Immediate(0xFF));
   __ j(ABOVE, &fall_through, Assembler::kNearJump);
   __ movb(FieldAddress(RAX, R12, TIMES_1, Uint8Array::data_offset()), RDI);
   __ ret();
   __ Bind(&fall_through);
   return false;
 }
 
 
+bool Intrinsifier::UintClamped8Array_getIndexed(Assembler* assembler) {
+  return Uint8Array_setIndexed(assembler);
+}
+
+
+bool Intrinsifier::Uint8ClampedArray_setIndexed(Assembler* assembler) {
+  Label fall_through, store_value, load_0xff;
+  // Verify that the array index is valid.
+  TestByteArraySetIndex(assembler, &fall_through);
+  // After TestByteArraySetIndex:
+  // * RAX has the base address of the byte array.
+  // * R12 has the index into the array.
+  // R12 contains the SMI index which is shifted by 1.
+  __ SmiUntag(R12);
+  __ movq(RDI, Address(RSP, + 1 * kWordSize));  // Value.
+  __ testq(RDI, Immediate(kSmiTagMask));
+  __ j(NOT_ZERO, &fall_through, Assembler::kNearJump);
+
+  __ SmiUntag(RDI);
+  __ cmpq(RDI, Immediate(0xFF));
+  __ j(BELOW_EQUAL, &store_value, Assembler::kNearJump);
+  __ j(GREATER, &load_0xff,  Assembler::kNearJump);
+  __ xorq(RDI, RDI);  // Zero.
+  __ jmp(&store_value, Assembler::kNearJump);
+  __ Bind(&load_0xff);
+  __ movq(RDI, Immediate(0xFF));
+
+  __ Bind(&store_value);
+  __ movb(FieldAddress(RAX, R12, TIMES_1, Uint8Array::data_offset()), RDI);
+  __ ret();
+  __ Bind(&fall_through);
+  return false;
+}
+
+
 bool Intrinsifier::Uint8Array_getIndexed(Assembler* assembler) {
   Label fall_through;
   TestByteArrayIndex(assembler, &fall_through);
   __ SmiUntag(R12);
   __ movzxb(RAX, FieldAddress(RAX,
                               R12,
                               TIMES_1,
                               Uint8Array::data_offset()));
   __ SmiTag(RAX);
   __ ret();
@@ skipping 1060 matching lines @@
   __ LoadObject(RAX, Bool::True());
   __ ret();
   return true;
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64