Infer range for BIT_XOR.

runtime/vm/flow_graph_compiler_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1582 matching lines @@
       ASSERT(destination.IsQuadStackSlot());
       const intptr_t source_offset = source.ToStackSlotOffset();
       const intptr_t dest_offset = destination.ToStackSlotOffset();
       __ LoadQFromOffset(VTMP, source.base_reg(), source_offset, PP);
       __ StoreQToOffset(VTMP, destination.base_reg(), dest_offset, PP);
     }
   } else {
     ASSERT(source.IsConstant());
     const Object& constant = source.constant();
     if (destination.IsRegister()) {
-      __ LoadObject(destination.reg(), constant, PP);
+      if (constant.IsSmi() &&
+          (source.constant_instruction()->representation() == kUnboxedInt32)) {
+        __ LoadImmediate(destination.reg(),
+                         static_cast<int32_t>(Smi::Cast(constant).Value()),
+                         PP);
+      } else {
+        __ LoadObject(destination.reg(), constant, PP);
+      }
     } else if (destination.IsFpuRegister()) {
       const VRegister dst = destination.fpu_reg();
       if (Utils::DoublesBitEqual(Double::Cast(constant).value(), 0.0)) {
         __ veor(dst, dst, dst);
       } else {
         ScratchRegisterScope tmp(this, kNoRegister);
         __ LoadObject(tmp.reg(), constant, PP);
         __ LoadDFieldFromOffset(dst, tmp.reg(), Double::value_offset(), PP);
       }
     } else if (destination.IsDoubleStackSlot()) {
       if (Utils::DoublesBitEqual(Double::Cast(constant).value(), 0.0)) {
         __ veor(VTMP, VTMP, VTMP);
       } else {
         ScratchRegisterScope tmp(this, kNoRegister);
         __ LoadObject(tmp.reg(), constant, PP);
         __ LoadDFieldFromOffset(VTMP, tmp.reg(), Double::value_offset(), PP);
       }
       const intptr_t dest_offset = destination.ToStackSlotOffset();
       __ StoreDToOffset(VTMP, destination.base_reg(), dest_offset, PP);
     } else {
       ASSERT(destination.IsStackSlot());
       const intptr_t dest_offset = destination.ToStackSlotOffset();
       ScratchRegisterScope tmp(this, kNoRegister);
-      __ LoadObject(tmp.reg(), constant, PP);
+      if (constant.IsSmi() &&
+          (source.constant_instruction()->representation() == kUnboxedInt32)) {
+        __ LoadImmediate(tmp.reg(),
+                         static_cast<int32_t>(Smi::Cast(constant).Value()),
+                         PP);
+      } else {
+        __ LoadObject(tmp.reg(), constant, PP);
+      }
       __ StoreToOffset(tmp.reg(), destination.base_reg(), dest_offset, PP);
     }
   }
 
   move->Eliminate();
 }
 
 
 void ParallelMoveResolver::EmitSwap(int index) {
   MoveOperands* move = moves_[index];
@@ skipping 154 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ PopDouble(reg);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64