Add support for XMM registers in SSA code generation pipeline.

runtime/vm/flow_graph_compiler.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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 181 matching lines @@
 }
 
 
 bool FlowGraphCompiler::IsNextBlock(BlockEntryInstr* block_entry) const {
   intptr_t current_index = reverse_index(current_block()->postorder_number());
   return (current_index < (block_order().length() - 1)) &&
       (block_order()[current_index + 1] == block_entry);
 }
 
 
-void FlowGraphCompiler::SaveLiveRegisters(LocationSummary* locs) {
-  // TODO(vegorov): consider saving only caller save (volatile) registers.
-  for (intptr_t reg_idx = 0; reg_idx < kNumberOfCpuRegisters; ++reg_idx) {
-    Register reg = static_cast<Register>(reg_idx);
-    if (locs->live_registers()->Contains(reg)) {
-      assembler()->PushRegister(reg);
-    }
-  }
-}
-
-
-void FlowGraphCompiler::RestoreLiveRegisters(LocationSummary* locs) {
-  for (intptr_t reg_idx = kNumberOfCpuRegisters - 1; reg_idx >= 0; --reg_idx) {
-    Register reg = static_cast<Register>(reg_idx);
-    if (locs->live_registers()->Contains(reg)) {
-      assembler()->PopRegister(reg);
-    }
-  }
-}
-
-
 void FlowGraphCompiler::AddSlowPathCode(SlowPathCode* code) {
   slow_path_code_.Add(code);
 }
 
 
 void FlowGraphCompiler::GenerateDeferredCode() {
   for (intptr_t i = 0; i < slow_path_code_.length(); i++) {
     slow_path_code_[i]->EmitNativeCode(this);
   }
   for (intptr_t i = 0; i < deopt_stubs_.length(); i++) {
@@ skipping 408 matching lines @@
     switch (result_location.policy()) {
       case Location::kAny:
       case Location::kPrefersRegister:
       case Location::kRequiresRegister:
         result_location = Location::RegisterLocation(
             AllocateFreeRegister(blocked_registers));
         break;
       case Location::kSameAsFirstInput:
         result_location = locs->in(0);
         break;
+      case Location::kRequiresXmmRegister:
+        UNREACHABLE();
+        break;
     }
     locs->set_out(result_location);
   }
 }
 
 
 ParallelMoveResolver::ParallelMoveResolver(FlowGraphCompiler* compiler)
     : compiler_(compiler), moves_(32) {}
 
 
@@ skipping 95 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 }  // namespace dart