Experimental parser: merge r19949

src/mips/lithium-mips.cc

 // Copyright 2012 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 601 matching lines @@
 LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
                                         HInstruction* hinstr,
                                         CanDeoptimize can_deoptimize) {
   info()->MarkAsNonDeferredCalling();
 #ifdef DEBUG
   instr->VerifyCall();
 #endif
   instr->MarkAsCall();
   instr = AssignPointerMap(instr);
 
-  if (hinstr->HasObservableSideEffects()) {
-    ASSERT(hinstr->next()->IsSimulate());
-    HSimulate* sim = HSimulate::cast(hinstr->next());
-    ASSERT(instruction_pending_deoptimization_environment_ == NULL);
-    ASSERT(pending_deoptimization_ast_id_.IsNone());
-    instruction_pending_deoptimization_environment_ = instr;
-    pending_deoptimization_ast_id_ = sim->ast_id();
-  }
-
   // If instruction does not have side-effects lazy deoptimization
   // after the call will try to deoptimize to the point before the call.
   // Thus we still need to attach environment to this call even if
   // call sequence can not deoptimize eagerly.
   bool needs_environment =
       (can_deoptimize == CAN_DEOPTIMIZE_EAGERLY) ||
       !hinstr->HasObservableSideEffects();
   if (needs_environment && !instr->HasEnvironment()) {
     instr = AssignEnvironment(instr);
   }
@@ skipping 265 matching lines @@
     }
 #endif
 
     if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
       instr = AssignPointerMap(instr);
     }
     if (FLAG_stress_environments && !instr->HasEnvironment()) {
       instr = AssignEnvironment(instr);
     }
     chunk_->AddInstruction(instr, current_block_);
+
+    if (instr->IsCall()) {
+      HValue* hydrogen_value_for_lazy_bailout = current;
+      LInstruction* instruction_needing_environment = NULL;
+      if (current->HasObservableSideEffects()) {
+        HSimulate* sim = HSimulate::cast(current->next());
+        instruction_needing_environment = instr;
+        sim->ReplayEnvironment(current_block_->last_environment());
+        hydrogen_value_for_lazy_bailout = sim;
+      }
+      LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
+      bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
+      chunk_->AddInstruction(bailout, current_block_);
+      if (instruction_needing_environment != NULL) {
+        // Store the lazy deopt environment with the instruction if needed.
+        // Right now it is only used for LInstanceOfKnownGlobal.
+        instruction_needing_environment->
+            SetDeferredLazyDeoptimizationEnvironment(bailout->environment());
+      }
+    }
   }
   current_instruction_ = old_current;
 }
 
 
 LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
   return new(zone()) LGoto(instr->FirstSuccessor());
 }
 
 
@@ skipping 311 matching lines @@
 
     LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
     LOperand* right = UseOrConstantAtStart(instr->BetterRightOperand());
     return DefineAsRegister(new(zone()) LBitI(left, right));
   } else {
     return DoArithmeticT(instr->op(), instr);
   }
 }
 
 
+LInstruction* LChunkBuilder::DoDivByPowerOf2I(HDiv* instr) {
+  ASSERT(instr->representation().IsSmiOrInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  int32_t divisor = instr->right()->GetInteger32Constant();
+  LInstruction* result = DefineAsRegister(new(zone()) LDivByPowerOf2I(
+          dividend, divisor));
+  if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
+      (instr->CheckFlag(HValue::kCanOverflow) && divisor == -1) ||
+      (!instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32) &&
+       divisor != 1 && divisor != -1)) {
+    result = AssignEnvironment(result);
+  }
+  return result;
+}
+
+
+LInstruction* LChunkBuilder::DoDivByConstI(HDiv* instr) {
+  ASSERT(instr->representation().IsInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  int32_t divisor = instr->right()->GetInteger32Constant();
+  LInstruction* result = DefineAsRegister(new(zone()) LDivByConstI(
+          dividend, divisor));
+  if (divisor == 0 ||
+      (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
+      !instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
+    result = AssignEnvironment(result);
+  }
+  return result;
+}
+
+
+LInstruction* LChunkBuilder::DoDivI(HBinaryOperation* instr) {
+  ASSERT(instr->representation().IsSmiOrInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  LOperand* divisor = UseRegister(instr->right());
+  LDivI* div = new(zone()) LDivI(dividend, divisor);
+  return AssignEnvironment(DefineAsRegister(div));
+}
+
+
 LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
   if (instr->representation().IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    LOperand* dividend = UseRegister(instr->left());
-    LOperand* divisor = UseRegister(instr->right());
-    LDivI* div = new(zone()) LDivI(dividend, divisor);
-    return AssignEnvironment(DefineAsRegister(div));
+    if (instr->RightIsPowerOf2()) {
+      return DoDivByPowerOf2I(instr);
+    } else if (instr->right()->IsConstant()) {
+      return DoDivByConstI(instr);
+    } else {
+      return DoDivI(instr);
+    }
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::DIV, instr);
   } else {
     return DoArithmeticT(Token::DIV, instr);
   }
 }
 
 
-bool LChunkBuilder::HasMagicNumberForDivisor(int32_t divisor) {
-  uint32_t divisor_abs = abs(divisor);
-  // Dividing by 0, 1, and powers of 2 is easy.
-  // Note that IsPowerOf2(0) returns true;
-  ASSERT(IsPowerOf2(0) == true);
-  if (IsPowerOf2(divisor_abs)) return true;
+LInstruction* LChunkBuilder::DoFlooringDivByPowerOf2I(HMathFloorOfDiv* instr) {
+  LOperand* dividend = UseRegisterAtStart(instr->left());
+  int32_t divisor = instr->right()->GetInteger32Constant();
+  LInstruction* result = DefineAsRegister(new(zone()) LFlooringDivByPowerOf2I(
+          dividend, divisor));
+  if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
+      (instr->CheckFlag(HValue::kLeftCanBeMinInt) && divisor == -1)) {
+    result = AssignEnvironment(result);
+  }
+  return result;
+}
 
-  // We have magic numbers for a few specific divisors.
-  // Details and proofs can be found in:
-  // - Hacker's Delight, Henry S. Warren, Jr.
-  // - The PowerPC Compiler Writer's Guide
-  // and probably many others.
-  //
-  // We handle
-  //   <divisor with magic numbers> * <power of 2>
-  // but not
-  //   <divisor with magic numbers> * <other divisor with magic numbers>
-  int32_t power_of_2_factor =
-    CompilerIntrinsics::CountTrailingZeros(divisor_abs);
-  DivMagicNumbers magic_numbers =
-    DivMagicNumberFor(divisor_abs >> power_of_2_factor);
-  if (magic_numbers.M != InvalidDivMagicNumber.M) return true;
 
-  return false;
+LInstruction* LChunkBuilder::DoFlooringDivByConstI(HMathFloorOfDiv* instr) {
+  ASSERT(instr->representation().IsInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  int32_t divisor = instr->right()->GetInteger32Constant();
+  LInstruction* result =
+      DefineAsRegister(new(zone()) LFlooringDivByConstI(dividend, divisor));
+  bool can_deopt =
+      divisor == 0 ||
+      (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0);
+  return can_deopt ? AssignEnvironment(result) : result;
 }
 
 
 LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
-    HValue* right = instr->right();
-    LOperand* dividend = UseRegister(instr->left());
-    LOperand* divisor = UseRegisterOrConstant(right);
-    LOperand* remainder = TempRegister();
-    return AssignEnvironment(DefineAsRegister(
-          new(zone()) LMathFloorOfDiv(dividend, divisor, remainder)));
+  if (instr->RightIsPowerOf2()) {
+    return DoFlooringDivByPowerOf2I(instr);
+  } else if (false && instr->right()->IsConstant()) {
+    return DoFlooringDivByConstI(instr);  // TODO(svenpanne) Fix and re-enable.
+  } else {
+    return DoDivI(instr);
+  }
+}
+
+
+LInstruction* LChunkBuilder::DoModByPowerOf2I(HMod* instr) {
+  ASSERT(instr->representation().IsSmiOrInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegisterAtStart(instr->left());
+  int32_t divisor = instr->right()->GetInteger32Constant();
+  LInstruction* result = DefineSameAsFirst(new(zone()) LModByPowerOf2I(
+          dividend, divisor));
+  if (instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    result = AssignEnvironment(result);
+  }
+  return result;
+}
+
+
+LInstruction* LChunkBuilder::DoModByConstI(HMod* instr) {
+  ASSERT(instr->representation().IsSmiOrInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  int32_t divisor = instr->right()->GetInteger32Constant();
+  LInstruction* result = DefineAsRegister(new(zone()) LModByConstI(
+          dividend, divisor));
+  if (divisor == 0 || instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    result = AssignEnvironment(result);
+  }
+  return result;
+}
+
+
+LInstruction* LChunkBuilder::DoModI(HMod* instr) {
+  ASSERT(instr->representation().IsSmiOrInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  LOperand* divisor = UseRegister(instr->right());
+  LInstruction* result = DefineAsRegister(new(zone()) LModI(
+      dividend, divisor));
+  if (instr->CheckFlag(HValue::kCanBeDivByZero) ||
+      instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+    result = AssignEnvironment(result);
+  }
+  return result;
 }
 
 
 LInstruction* LChunkBuilder::DoMod(HMod* instr) {
-  HValue* left = instr->left();
-  HValue* right = instr->right();
   if (instr->representation().IsSmiOrInteger32()) {
-    ASSERT(instr->left()->representation().Equals(instr->representation()));
-    ASSERT(instr->right()->representation().Equals(instr->representation()));
-    if (instr->RightIsPowerOf2()) {
-      ASSERT(!right->CanBeZero());
-      LModI* mod = new(zone()) LModI(UseRegisterAtStart(left),
-                                     UseConstant(right));
-      LInstruction* result = DefineAsRegister(mod);
-      return (left->CanBeNegative() &&
-              instr->CheckFlag(HValue::kBailoutOnMinusZero))
-          ? AssignEnvironment(result)
-          : result;
-    } else {
-      LModI* mod = new(zone()) LModI(UseRegister(left),
-                                     UseRegister(right),
-                                     TempRegister(),
-                                     FixedTemp(f20),
-                                     FixedTemp(f22));
-      LInstruction* result = DefineAsRegister(mod);
-      return (right->CanBeZero() ||
-              (left->RangeCanInclude(kMinInt) &&
-               right->RangeCanInclude(-1)) ||
-              instr->CheckFlag(HValue::kBailoutOnMinusZero))
-          ? AssignEnvironment(result)
-          : result;
-    }
+    return instr->RightIsPowerOf2() ? DoModByPowerOf2I(instr) : DoModI(instr);
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::MOD, instr);
   } else {
     return DoArithmeticT(Token::MOD, instr);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoMul(HMul* instr) {
   if (instr->representation().IsSmiOrInteger32()) {
@@ skipping 424 matching lines @@
       ASSERT(to.IsInteger32());
       LOperand* value = UseRegister(instr->value());
       LDoubleToI* res = new(zone()) LDoubleToI(value);
       return AssignEnvironment(DefineAsRegister(res));
     }
   } else if (from.IsInteger32()) {
     info()->MarkAsDeferredCalling();
     if (to.IsTagged()) {
       HValue* val = instr->value();
       LOperand* value = UseRegisterAtStart(val);
-      if (val->CheckFlag(HInstruction::kUint32)) {
-        LNumberTagU* result = new(zone()) LNumberTagU(value);
+      if (!instr->CheckFlag(HValue::kCanOverflow)) {
+        return DefineAsRegister(new(zone()) LSmiTag(value));
+      } else if (val->CheckFlag(HInstruction::kUint32)) {
+        LOperand* temp1 = TempRegister();
+        LOperand* temp2 = TempRegister();
+        LNumberTagU* result = new(zone()) LNumberTagU(value, temp1, temp2);
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
-      } else if (val->HasRange() && val->range()->IsInSmiRange()) {
-        return DefineAsRegister(new(zone()) LSmiTag(value));
       } else {
-        LNumberTagI* result = new(zone()) LNumberTagI(value);
+        LOperand* temp1 = TempRegister();
+        LOperand* temp2 = TempRegister();
+        LNumberTagI* result = new(zone()) LNumberTagI(value, temp1, temp2);
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
       }
     } else if (to.IsSmi()) {
       HValue* val = instr->value();
       LOperand* value = UseRegister(val);
-      LInstruction* result = val->CheckFlag(HInstruction::kUint32)
-          ? DefineAsRegister(new(zone()) LUint32ToSmi(value))
-          : DefineAsRegister(new(zone()) LInteger32ToSmi(value));
-      if (val->HasRange() && val->range()->IsInSmiRange()) {
-        return result;
+      LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
+      if (instr->CheckFlag(HValue::kCanOverflow)) {
+        result = AssignEnvironment(result);
       }
-      return AssignEnvironment(result);
+      return result;
     } else {
       ASSERT(to.IsDouble());
       if (instr->value()->CheckFlag(HInstruction::kUint32)) {
         return DefineAsRegister(
             new(zone()) LUint32ToDouble(UseRegister(instr->value())));
       } else {
         return DefineAsRegister(
             new(zone()) LInteger32ToDouble(Use(instr->value())));
       }
     }
@@ skipping 55 matching lines @@
   } else {
     ASSERT(input_rep.IsSmiOrTagged());
     // Register allocator doesn't (yet) support allocation of double
     // temps. Reserve f22 explicitly.
     LClampTToUint8* result = new(zone()) LClampTToUint8(reg, FixedTemp(f22));
     return AssignEnvironment(DefineAsRegister(result));
   }
 }
 
 
+LInstruction* LChunkBuilder::DoDoubleBits(HDoubleBits* instr) {
+  HValue* value = instr->value();
+  ASSERT(value->representation().IsDouble());
+  return DefineAsRegister(new(zone()) LDoubleBits(UseRegister(value)));
+}
+
+
+LInstruction* LChunkBuilder::DoConstructDouble(HConstructDouble* instr) {
+  LOperand* lo = UseRegister(instr->lo());
+  LOperand* hi = UseRegister(instr->hi());
+  return DefineAsRegister(new(zone()) LConstructDouble(hi, lo));
+}
+
+
 LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
   LOperand* context = info()->IsStub()
       ? UseFixed(instr->context(), cp)
       : NULL;
   LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
   return new(zone()) LReturn(UseFixed(instr->value(), v0), context,
                              parameter_count);
 }
 
 
@@ skipping 236 matching lines @@
     obj = is_in_object
         ? UseRegister(instr->object())
         : UseTempRegister(instr->object());
   } else {
     obj = needs_write_barrier_for_map
         ? UseRegister(instr->object())
         : UseRegisterAtStart(instr->object());
   }
 
   LOperand* val;
-  if (needs_write_barrier ||
-      (FLAG_track_fields && instr->field_representation().IsSmi())) {
+  if (needs_write_barrier || instr->field_representation().IsSmi()) {
     val = UseTempRegister(instr->value());
-  } else if (FLAG_track_double_fields &&
-             instr->field_representation().IsDouble()) {
+  } else if (instr->field_representation().IsDouble()) {
     val = UseRegisterAtStart(instr->value());
   } else {
     val = UseRegister(instr->value());
   }
 
   // We need a temporary register for write barrier of the map field.
   LOperand* temp = needs_write_barrier_for_map ? TempRegister() : NULL;
 
   LStoreNamedField* result = new(zone()) LStoreNamedField(obj, val, temp);
-  if (FLAG_track_heap_object_fields &&
-      instr->field_representation().IsHeapObject()) {
+  if (instr->field_representation().IsHeapObject()) {
     if (!instr->value()->type().IsHeapObject()) {
       return AssignEnvironment(result);
     }
   }
   return result;
 }
 
 
 LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
@@ skipping 158 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
     HIsConstructCallAndBranch* instr) {
   return new(zone()) LIsConstructCallAndBranch(TempRegister());
 }
 
 
 LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
   instr->ReplayEnvironment(current_block_->last_environment());
-
-  // If there is an instruction pending deoptimization environment create a
-  // lazy bailout instruction to capture the environment.
-  if (pending_deoptimization_ast_id_ == instr->ast_id()) {
-    LInstruction* result = new(zone()) LLazyBailout;
-    result = AssignEnvironment(result);
-    // Store the lazy deopt environment with the instruction if needed. Right
-    // now it is only used for LInstanceOfKnownGlobal.
-    instruction_pending_deoptimization_environment_->
-        SetDeferredLazyDeoptimizationEnvironment(result->environment());
-    instruction_pending_deoptimization_environment_ = NULL;
-    pending_deoptimization_ast_id_ = BailoutId::None();
-    return result;
-  }
-
   return NULL;
 }
 
 
 LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
   if (instr->is_function_entry()) {
     LOperand* context = UseFixed(instr->context(), cp);
     return MarkAsCall(new(zone()) LStackCheck(context), instr);
   } else {
     ASSERT(instr->is_backwards_branch());
@@ skipping 64 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseRegister(instr->index());
   return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal