Inline Math.sqrt in new compilers.

runtime/vm/flow_graph_compiler_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/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 847 matching lines @@
   __ movq(RAX, Address(RSP, 2 * kWordSize));  // Receiver.
   __ movq(RBX, Address(RSP, 1 * kWordSize));  // Value.
   __ StoreIntoObject(RAX, FieldAddress(RAX, offset), RBX);
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   __ movq(RAX, raw_null);
   __ ret();
 }
 
 
+// TODO(srdjan): For Math.sqrt read type feedback in Math.sqrt and decide
+// if the argument is double, smi or something else.
+void FlowGraphCompiler::GenerateInlinedMathSqrt(Label* done) {
+  Label smi_to_double, call_method;
+  __ movq(RAX, Address(RSP, 0));
+  __ testq(RAX, Immediate(kSmiTagMask));
+  __ j(ZERO, &smi_to_double, Assembler::kNearJump);
+  __ CompareClassId(RAX, kDouble);
+  __ j(NOT_EQUAL, &call_method, Assembler::kNearJump);
+  __ movsd(XMM1, FieldAddress(RAX, Double::value_offset()));
+  __ sqrtsd(XMM0, XMM1);
+  // TODO(regis): Should we cache double_class in FlowGraphCompiler instance?
+  const Class& double_class =
+      Class::ZoneHandle(Isolate::Current()->object_store()->double_class());
+  AssemblerMacros::TryAllocate(assembler_,
+                               double_class,
+                               &call_method,
+                               RAX);  // Result register.
+  __ movsd(FieldAddress(RAX, Double::value_offset()), XMM0);
+  __ jmp(done);
+  __ Bind(&smi_to_double);
+  __ Bind(&call_method);
+}
+
+
 void FlowGraphCompiler::CompileGraph() {
   InitCompiler();
   if (TryIntrinsify()) {
     // Make it patchable: code must have a minimum code size, nop(2) increases
     // the minimum code size appropriately.
     __ nop(2);
     __ int3();
     __ jmp(&StubCode::FixCallersTargetLabel());
     return;
   }
@@ skipping 148 matching lines @@
   __ cvtsi2sd(result, temp);
   __ Bind(&done);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64