A64: Implement LMathFloorOfDiv and enable the instruction in hydrogen

src/a64/lithium-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1666 matching lines @@
   return MarkAsCall(result, instr);
 }
 
 
 LInstruction* LChunkBuilder::DoMapEnumLength(HMapEnumLength* instr) {
   LOperand* map = UseRegisterAtStart(instr->value());
   return DefineAsRegister(new(zone()) LMapEnumLength(map));
 }
 
 
+HValue* LChunkBuilder::SimplifiedDividendForMathFloorOfDiv(HValue* dividend) {
+  // A value with an integer representation does not need to be transformed.
+  if (dividend->representation().IsInteger32()) {
+    return dividend;
+  // A change from an integer32 can be replaced by the integer32 value.
+  } else if (dividend->IsChange() &&
+      HChange::cast(dividend)->from().IsInteger32()) {
+    return HChange::cast(dividend)->value();
+  }
+  return NULL;
+}
+
+
+HValue* LChunkBuilder::SimplifiedDivisorForMathFloorOfDiv(HValue* divisor) {
+  // A value with an integer representation does not need to be transformed.
+  if (divisor->representation().IsInteger32()) {
+    return divisor;
+  // A change from an integer32 can be replaced by the integer32 value.
+  } else if (divisor->IsChange() &&
+             HChange::cast(divisor)->from().IsInteger32()) {
+    return HChange::cast(divisor)->value();
+  }
+
+  if (divisor->IsConstant() && HConstant::cast(divisor)->HasInteger32Value()) {
+    HConstant* constant_val = HConstant::cast(divisor);
+    return constant_val->CopyToRepresentation(Representation::Integer32(),
+                                              divisor->block()->zone());
+  }
+
+  return NULL;
+}
+
+
 LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
+  HValue* right = instr->right();
+  LOperand* dividend = UseRegister(instr->left());
+  LOperand* divisor = UseRegister(right);
+  LOperand* remainder = TempRegister();
+  return AssignEnvironment(DefineAsRegister(
+          new(zone()) LMathFloorOfDiv(dividend, divisor, remainder)));
 }
 
 
 LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
   LOperand* left = NULL;
   LOperand* right = NULL;
   if (instr->representation().IsInteger32()) {
     ASSERT(instr->left()->representation().IsInteger32());
     ASSERT(instr->right()->representation().IsInteger32());
     left = UseRegisterAtStart(instr->BetterLeftOperand());
@@ skipping 688 matching lines @@
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());
   LOperand* temp = TempRegister();
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function, temp);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal