Optimistically inline Math.sqrt as unboxed sqrtsd instruction.

runtime/vm/intermediate_language_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/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 1988 matching lines @@
   switch (op_kind()) {
     case Token::kADD: __ addsd(left, right); break;
     case Token::kSUB: __ subsd(left, right); break;
     case Token::kMUL: __ mulsd(left, right); break;
     case Token::kDIV: __ divsd(left, right); break;
     default: UNREACHABLE();
   }
 }
 
 
+LocationSummary* MathSqrtInstr::MakeLocationSummary() const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  summary->set_in(0, Location::RequiresXmmRegister());
+  summary->set_out(Location::RequiresXmmRegister());
+  return summary;
+}
+
+
+void MathSqrtInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  __ sqrtsd(locs()->out().xmm_reg(), locs()->in(0).xmm_reg());
+}
+
+
 LocationSummary* UnarySmiOpInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_out(Location::SameAsFirstInput());
   return summary;
 }
 
@@ skipping 291 matching lines @@
     __ j(ABOVE_EQUAL, deopt);
   }
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64