Added infrastructure for optimizing new CanvasArray types in WebGL...

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
===================================================================
--- src/x64/macro-assembler-x64.cc	(revision 3095)
+++ src/x64/macro-assembler-x64.cc	(working copy)
@@ -580,6 +580,14 @@
 }
 
 
+Condition MacroAssembler::CheckUInteger32ValidSmiValue(Register src) {
+  // An unsigned 32-bit integer value is valid as long as the high bit
+  // is not set.
+  testq(src, Immediate(0x80000000));
+  return zero;
+}
+
+
 void MacroAssembler::SmiNeg(Register dst, Register src, Label* on_smi_result) {
   if (dst.is(src)) {
     ASSERT(!dst.is(kScratchRegister));
@@ -1243,6 +1251,13 @@
 }
 
 
+void MacroAssembler::JumpIfUIntNotValidSmiValue(Register src,
+                                                Label* on_invalid) {
+  Condition is_valid = CheckUInteger32ValidSmiValue(src);
+  j(NegateCondition(is_valid), on_invalid);
+}
+
+
 void MacroAssembler::JumpIfNotBothSmi(Register src1, Register src2,
                                       Label* on_not_both_smi) {
   Condition both_smi = CheckBothSmi(src1, src2);
@@ -2213,6 +2228,23 @@
 }
 
 
+void MacroAssembler::AllocateHeapNumber(Register result,
+                                        Register scratch,
+                                        Label* gc_required) {
+  // Allocate heap number in new space.
+  AllocateInNewSpace(HeapNumber::kSize,
+                     result,
+                     scratch,
+                     no_reg,
+                     gc_required,
+                     TAG_OBJECT);
+
+  // Set the map.
+  LoadRoot(kScratchRegister, Heap::kHeapNumberMapRootIndex);
+  movq(FieldOperand(result, HeapObject::kMapOffset), kScratchRegister);
+}
+
+
 CodePatcher::CodePatcher(byte* address, int size)
     : address_(address), size_(size), masm_(address, size + Assembler::kGap) {
   // Create a new macro assembler pointing to the address of the code to patch.