[turbofan] Add backend support for float32.

src/compiler/simplified-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/simplified-lowering.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph-inl.h"
@@ skipping 270 matching lines @@
         ProcessInput(node, iter.index(), values > 0 ? use : 0);
       }
     }
     // Phis adapt to whatever output representation their uses demand,
     // pushing representation changes to their inputs.
     MachineTypeUnion use_rep = GetUseInfo(node) & kRepMask;
     MachineTypeUnion use_type = GetUseInfo(node) & kTypeMask;
     MachineTypeUnion rep = 0;
     if (use_rep & kRepTagged) {
       rep = kRepTagged;  // Tagged overrides everything.
+    } else if (use_rep & kRepFloat32) {
+      rep = kRepFloat32;
     } else if (use_rep & kRepFloat64) {
       rep = kRepFloat64;
     } else if (use_rep & kRepWord64) {
       rep = kRepWord64;
     } else if (use_rep & kRepWord32) {
       rep = kRepWord32;
     } else if (use_rep & kRepBit) {
       rep = kRepBit;
     } else {
       // There was no representation associated with any of the uses.
@@ skipping 41 matching lines @@
   }
 
   const Operator* Uint32Op(Node* node) {
     return changer_->Uint32OperatorFor(node->opcode());
   }
 
   const Operator* Float64Op(Node* node) {
     return changer_->Float64OperatorFor(node->opcode());
   }
 
-  static MachineType AssumeImplicitFloat32Change(MachineType type) {
-    // TODO(titzer): Assume loads of float32 change representation to float64.
-    // Fix this with full support for float32 representations.
-    if (type & kRepFloat32) {
-      return static_cast<MachineType>((type & ~kRepFloat32) | kRepFloat64);
-    }
-    return type;
-  }
-
   // Dispatching routine for visiting the node {node} with the usage {use}.
   // Depending on the operator, propagate new usage info to the inputs.
   void VisitNode(Node* node, MachineTypeUnion use,
                  SimplifiedLowering* lowering) {
     switch (node->opcode()) {
       //------------------------------------------------------------------
       // Common operators.
       //------------------------------------------------------------------
       case IrOpcode::kStart:
       case IrOpcode::kDead:
@@ skipping 201 matching lines @@
       }
       case IrOpcode::kStringAdd: {
         VisitBinop(node, kMachAnyTagged, kMachAnyTagged);
         if (lower()) lowering->DoStringAdd(node);
         break;
       }
       case IrOpcode::kLoadField: {
         FieldAccess access = FieldAccessOf(node->op());
         ProcessInput(node, 0, changer_->TypeForBasePointer(access));
         ProcessRemainingInputs(node, 1);
-        SetOutput(node, AssumeImplicitFloat32Change(access.machine_type));
+        SetOutput(node, access.machine_type);
         if (lower()) lowering->DoLoadField(node);
         break;
       }
       case IrOpcode::kStoreField: {
         FieldAccess access = FieldAccessOf(node->op());
         ProcessInput(node, 0, changer_->TypeForBasePointer(access));
-        ProcessInput(node, 1, AssumeImplicitFloat32Change(access.machine_type));
+        ProcessInput(node, 1, access.machine_type);
         ProcessRemainingInputs(node, 2);
         SetOutput(node, 0);
         if (lower()) lowering->DoStoreField(node);
         break;
       }
       case IrOpcode::kLoadElement: {
         ElementAccess access = ElementAccessOf(node->op());
         ProcessInput(node, 0, changer_->TypeForBasePointer(access));
         ProcessInput(node, 1, kMachInt32);  // element index
         ProcessInput(node, 2, kMachInt32);  // length
         ProcessRemainingInputs(node, 3);
-        SetOutput(node, AssumeImplicitFloat32Change(access.machine_type));
+        SetOutput(node, access.machine_type);
         if (lower()) lowering->DoLoadElement(node);
         break;
       }
       case IrOpcode::kStoreElement: {
         ElementAccess access = ElementAccessOf(node->op());
         ProcessInput(node, 0, changer_->TypeForBasePointer(access));
         ProcessInput(node, 1, kMachInt32);  // element index
         ProcessInput(node, 2, kMachInt32);  // length
-        ProcessInput(node, 3, AssumeImplicitFloat32Change(access.machine_type));
+        ProcessInput(node, 3, access.machine_type);
         ProcessRemainingInputs(node, 4);
         SetOutput(node, 0);
         if (lower()) lowering->DoStoreElement(node);
         break;
       }
 
       //------------------------------------------------------------------
       // Machine-level operators.
       //------------------------------------------------------------------
       case IrOpcode::kLoad: {
@@ skipping 72 matching lines @@
         return VisitBinop(node, kRepWord64, kRepWord64);
       case IrOpcode::kWord64Equal:
         return VisitBinop(node, kRepWord64, kRepBit);
 
       case IrOpcode::kChangeInt32ToInt64:
         return VisitUnop(node, kTypeInt32 | kRepWord32,
                          kTypeInt32 | kRepWord64);
       case IrOpcode::kChangeUint32ToUint64:
         return VisitUnop(node, kTypeUint32 | kRepWord32,
                          kTypeUint32 | kRepWord64);
+      case IrOpcode::kTruncateFloat64ToFloat32:
+        return VisitUnop(node, kTypeNumber | kRepFloat64,
+                         kTypeNumber | kRepFloat32);
       case IrOpcode::kTruncateInt64ToInt32:
         // TODO(titzer): Is kTypeInt32 correct here?
         return VisitUnop(node, kTypeInt32 | kRepWord64,
                          kTypeInt32 | kRepWord32);
 
+      case IrOpcode::kChangeFloat32ToFloat64:
+        return VisitUnop(node, kTypeNumber | kRepFloat32,
+                         kTypeNumber | kRepFloat64);
       case IrOpcode::kChangeInt32ToFloat64:
         return VisitUnop(node, kTypeInt32 | kRepWord32,
                          kTypeInt32 | kRepFloat64);
       case IrOpcode::kChangeUint32ToFloat64:
         return VisitUnop(node, kTypeUint32 | kRepWord32,
                          kTypeUint32 | kRepFloat64);
       case IrOpcode::kChangeFloat64ToInt32:
         return VisitUnop(node, kTypeInt32 | kRepFloat64,
                          kTypeInt32 | kRepWord32);
       case IrOpcode::kChangeFloat64ToUint32:
@@ skipping 218 matching lines @@
 void SimplifiedLowering::DoStringLessThanOrEqual(Node* node) {
   node->set_op(machine()->IntLessThanOrEqual());
   node->ReplaceInput(0, StringComparison(node, true));
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8