gt:             nativeABICallerSaveRegisters[i] = callerSave.get(i).asValue();
context: /*
   * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package com.oracle.graal.hotspot.amd64;
  
  import static com.oracle.graal.hotspot.InitTimer.*;
  
  import java.util.*;
  
  import com.oracle.graal.amd64.*;
  import com.oracle.graal.api.code.*;
  import com.oracle.graal.api.meta.*;
  import com.oracle.graal.api.replacements.*;
  import com.oracle.graal.api.runtime.*;
  import com.oracle.graal.hotspot.*;
  import com.oracle.graal.hotspot.meta.*;
  import com.oracle.graal.nodes.spi.*;
  import com.oracle.graal.phases.util.*;
  
  @ServiceProvider(HotSpotBackendFactory.class)
  public class AMD64HotSpotBackendFactory implements HotSpotBackendFactory {
  
      protected Architecture createArchitecture(HotSpotVMConfig config) {
          return new AMD64(computeFeatures(config), computeFlags(config));
      }
  
      protected EnumSet<AMD64.CPUFeature> computeFeatures(HotSpotVMConfig config) {
          // Configure the feature set using the HotSpot flag settings.
          EnumSet<AMD64.CPUFeature> features = EnumSet.noneOf(AMD64.CPUFeature.class);
          assert config.useSSE >= 2 : "minimum config for x64";
          features.add(AMD64.CPUFeature.SSE);
          features.add(AMD64.CPUFeature.SSE2);
          if ((config.x86CPUFeatures & config.cpuSSE3) != 0) {
              features.add(AMD64.CPUFeature.SSE3);
          }
          if ((config.x86CPUFeatures & config.cpuSSSE3) != 0) {
              features.add(AMD64.CPUFeature.SSSE3);
          }
          if ((config.x86CPUFeatures & config.cpuSSE4A) != 0) {
              features.add(AMD64.CPUFeature.SSE4a);
          }
          if ((config.x86CPUFeatures & config.cpuSSE41) != 0) {
              features.add(AMD64.CPUFeature.SSE4_1);
          }
          if ((config.x86CPUFeatures & config.cpuSSE42) != 0) {
              features.add(AMD64.CPUFeature.SSE4_2);
          }
          if ((config.x86CPUFeatures & config.cpuAVX) != 0) {
              features.add(AMD64.CPUFeature.AVX);
          }
          if ((config.x86CPUFeatures & config.cpuAVX2) != 0) {
              features.add(AMD64.CPUFeature.AVX2);
          }
          if ((config.x86CPUFeatures & config.cpuERMS) != 0) {
              features.add(AMD64.CPUFeature.ERMS);
          }
          if ((config.x86CPUFeatures & config.cpuLZCNT) != 0) {
              features.add(AMD64.CPUFeature.LZCNT);
          }
          if ((config.x86CPUFeatures & config.cpuPOPCNT) != 0) {
              features.add(AMD64.CPUFeature.POPCNT);
          }
          if ((config.x86CPUFeatures & config.cpuAES) != 0) {
              features.add(AMD64.CPUFeature.AES);
          }
          if ((config.x86CPUFeatures & config.cpu3DNOWPREFETCH) != 0) {
              features.add(AMD64.CPUFeature.AMD_3DNOW_PREFETCH);
          }
          if ((config.x86CPUFeatures & config.cpuBMI1) != 0) {
              features.add(AMD64.CPUFeature.BMI1);
          }
          return features;
      }
  
      protected EnumSet<AMD64.Flag> computeFlags(HotSpotVMConfig config) {
          EnumSet<AMD64.Flag> flags = EnumSet.noneOf(AMD64.Flag.class);
          if (config.useCountLeadingZerosInstruction) {
              flags.add(AMD64.Flag.UseCountLeadingZerosInstruction);
          }
          if (config.useCountTrailingZerosInstruction) {
              flags.add(AMD64.Flag.UseCountTrailingZerosInstruction);
          }
          return flags;
      }
  
      protected TargetDescription createTarget(HotSpotVMConfig config) {
          final int stackFrameAlignment = 16;
          final int implicitNullCheckLimit = 4096;
          final boolean inlineObjects = true;
          return new HotSpotTargetDescription(createArchitecture(config), true, stackFrameAlignment, implicitNullCheckLimit, inlineObjects);
      }
  
      @Override
      public HotSpotBackend createBackend(HotSpotGraalRuntimeProvider runtime, HotSpotBackend host) {
          assert host == null;
          TargetDescription target = createTarget(runtime.getConfig());
  
          HotSpotProviders providers;
          HotSpotRegistersProvider registers;
          RegisterConfig regConfig;
          HotSpotCodeCacheProvider codeCache;
          HotSpotConstantReflectionProvider constantReflection;
          HotSpotHostForeignCallsProvider foreignCalls;
          Value[] nativeABICallerSaveRegisters;
          HotSpotMetaAccessProvider metaAccess;
          HotSpotLoweringProvider lowerer;
          HotSpotSnippetReflectionProvider snippetReflection;
          Replacements replacements;
          HotSpotDisassemblerProvider disassembler;
          HotSpotSuitesProvider suites;
          try (InitTimer t = timer("create providers")) {
              try (InitTimer rt = timer("create HotSpotRegisters provider")) {
                  registers = createRegisters();
              }
              try (InitTimer rt = timer("create MetaAccess provider")) {
                  metaAccess = createMetaAccess(runtime);
              }
              try (InitTimer rt = timer("create RegisterConfig")) {
                  regConfig = createRegisterConfig(runtime, target);
              }
              try (InitTimer rt = timer("create CodeCache provider")) {
                  codeCache = createCodeCache(runtime, target, regConfig);
              }
              try (InitTimer rt = timer("create ConstantReflection provider")) {
                  constantReflection = createConstantReflection(runtime);
              }
              try (InitTimer rt = timer("create NativeABICallerSaveRegisters")) {
                  nativeABICallerSaveRegisters = createNativeABICallerSaveRegisters(runtime.getConfig(), codeCache.getRegisterConfig());
              }
              try (InitTimer rt = timer("create ForeignCalls provider")) {
                  foreignCalls = createForeignCalls(runtime, metaAccess, codeCache, nativeABICallerSaveRegisters);
              }
              try (InitTimer rt = timer("create Lowerer provider")) {
                  lowerer = createLowerer(runtime, metaAccess, foreignCalls, registers, target);
              }
              Providers p = new Providers(metaAccess, codeCache, constantReflection, foreignCalls, lowerer, null, new HotSpotStampProvider());
              try (InitTimer rt = timer("create SnippetReflection provider")) {
                  snippetReflection = createSnippetReflection(runtime);
              }
              try (InitTimer rt = timer("create Replacements provider")) {
                  replacements = createReplacements(runtime, p, snippetReflection);
              }
              try (InitTimer rt = timer("create Disassembler provider")) {
                  disassembler = createDisassembler(runtime);
              }
              try (InitTimer rt = timer("create Suites provider")) {
                  suites = createSuites(runtime, metaAccess, constantReflection, replacements);
              }
              providers = new HotSpotProviders(metaAccess, codeCache, constantReflection, foreignCalls, lowerer, replacements, disassembler, suites, registers, snippetReflection);
          }
          try (InitTimer rt = timer("instantiate backend")) {
              return createBackend(runtime, providers);
          }
      }
  
      protected AMD64HotSpotBackend createBackend(HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {
          return new AMD64HotSpotBackend(runtime, providers);
      }
  
      protected HotSpotRegistersProvider createRegisters() {
          return new HotSpotRegisters(AMD64.r15, AMD64.r12, AMD64.rsp);
      }
  
      protected HotSpotDisassemblerProvider createDisassembler(HotSpotGraalRuntimeProvider runtime) {
          return new HotSpotDisassemblerProvider(runtime);
      }
  
      protected Replacements createReplacements(HotSpotGraalRuntimeProvider runtime, Providers p, SnippetReflectionProvider snippetReflection) {
          return new HotSpotReplacementsImpl(p, snippetReflection, runtime.getConfig(), p.getCodeCache().getTarget());
      }
  
      protected AMD64HotSpotForeignCallsProvider createForeignCalls(HotSpotGraalRuntimeProvider runtime, HotSpotMetaAccessProvider metaAccess, HotSpotCodeCacheProvider codeCache,
                      Value[] nativeABICallerSaveRegisters) {
          return new AMD64HotSpotForeignCallsProvider(runtime, metaAccess, codeCache, nativeABICallerSaveRegisters);
      }
  
      protected HotSpotConstantReflectionProvider createConstantReflection(HotSpotGraalRuntimeProvider runtime) {
          return new HotSpotConstantReflectionProvider(runtime);
      }
  
      protected RegisterConfig createRegisterConfig(HotSpotGraalRuntimeProvider runtime, TargetDescription target) {
          return new AMD64HotSpotRegisterConfig(target.arch, runtime.getConfig());
      }
  
      protected HotSpotCodeCacheProvider createCodeCache(HotSpotGraalRuntimeProvider runtime, TargetDescription target, RegisterConfig regConfig) {
          return new HotSpotCodeCacheProvider(runtime, target, regConfig);
      }
  
      protected HotSpotMetaAccessProvider createMetaAccess(HotSpotGraalRuntimeProvider runtime) {
          return new HotSpotMetaAccessProvider(runtime);
      }
  
      protected HotSpotSuitesProvider createSuites(HotSpotGraalRuntimeProvider runtime, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection, Replacements replacements) {
          return new HotSpotSuitesProvider(runtime, metaAccess, constantReflection, replacements);
      }
  
      protected HotSpotSnippetReflectionProvider createSnippetReflection(HotSpotGraalRuntimeProvider runtime) {
          return new HotSpotSnippetReflectionProvider(runtime);
      }
  
      protected HotSpotLoweringProvider createLowerer(HotSpotGraalRuntimeProvider runtime, HotSpotMetaAccessProvider metaAccess, HotSpotForeignCallsProvider foreignCalls,
                      HotSpotRegistersProvider registers, TargetDescription target) {
          return new AMD64HotSpotLoweringProvider(runtime, metaAccess, foreignCalls, registers, target);
      }
  
      protected Value[] createNativeABICallerSaveRegisters(HotSpotVMConfig config, RegisterConfig regConfig) {
          List<Register> callerSave = new ArrayList<>(Arrays.asList(regConfig.getAllocatableRegisters()));
          if (config.windowsOs) {
              // http://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
              callerSave.remove(AMD64.rdi);
              callerSave.remove(AMD64.rsi);
              callerSave.remove(AMD64.rbx);
              callerSave.remove(AMD64.rbp);
              callerSave.remove(AMD64.rsp);
              callerSave.remove(AMD64.r12);
              callerSave.remove(AMD64.r13);
              callerSave.remove(AMD64.r14);
              callerSave.remove(AMD64.r15);
              callerSave.remove(AMD64.xmm6);
              callerSave.remove(AMD64.xmm7);
              callerSave.remove(AMD64.xmm8);
              callerSave.remove(AMD64.xmm9);
              callerSave.remove(AMD64.xmm10);
              callerSave.remove(AMD64.xmm11);
              callerSave.remove(AMD64.xmm12);
              callerSave.remove(AMD64.xmm13);
              callerSave.remove(AMD64.xmm14);
              callerSave.remove(AMD64.xmm15);
          } else {
              /*
               * System V Application Binary Interface, AMD64 Architecture Processor Supplement
               *
               * Draft Version 0.96
               *
               * http://www.uclibc.org/docs/psABI-x86_64.pdf
               *
               * 3.2.1
               *
               * ...
               *
               * This subsection discusses usage of each register. Registers %rbp, %rbx and %r12
               * through %r15 "belong" to the calling function and the called function is required to
               * preserve their values. In other words, a called function must preserve these
               * registers' values for its caller. Remaining registers "belong" to the called
               * function. If a calling function wants to preserve such a register value across a
               * function call, it must save the value in its local stack frame.
               */
              callerSave.remove(AMD64.rbp);
              callerSave.remove(AMD64.rbx);
              callerSave.remove(AMD64.r12);
              callerSave.remove(AMD64.r13);
              callerSave.remove(AMD64.r14);
              callerSave.remove(AMD64.r15);
          }
          Value[] nativeABICallerSaveRegisters = new Value[callerSave.size()];
          for (int i = 0; i < callerSave.size(); i++) {
  