[turbofan] Check word32 -> float64 conversion with input type/output truncation.

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 <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 382 matching lines @@
     SetOutput(node, output_type);
 
     int values = node->op()->ValueInputCount();
 
     if (lower()) {
       // Update the phi operator.
       MachineType type = static_cast<MachineType>(output_type);
       if (type != OpParameter<MachineType>(node)) {
         NodeProperties::ChangeOp(node, lowering->common()->Phi(type, values));
       }
+    }
 
-      // Convert inputs to the output representation of this phi.
-      for (int i = 0; i < node->InputCount(); i++) {
-        ProcessInput(node, i, i < values ? output_type : 0);
-      }
-    } else {
-      // Propagate {use} of the phi to value inputs, and 0 to control.
-      MachineType use_type =
-          static_cast<MachineType>((use & kTypeMask) | output);
-      for (int i = 0; i < node->InputCount(); i++) {
-        ProcessInput(node, i, i < values ? use_type : 0);
-      }
+    // Convert inputs to the output representation of this phi, pass the
+    // use truncation along.
+    MachineType use_type = static_cast<MachineType>((use & kTypeMask) | output);
+    for (int i = 0; i < node->InputCount(); i++) {
+      ProcessInput(node, i, i < values ? use_type : 0);
     }
   }
 
   void VisitCall(Node* node, SimplifiedLowering* lowering) {
     const CallDescriptor* desc = OpParameter<const CallDescriptor*>(node->op());
     const MachineSignature* sig = desc->GetMachineSignature();
     int params = static_cast<int>(sig->parameter_count());
     // Propagate representation information from call descriptor.
     for (int i = 0; i < node->InputCount(); i++) {
       if (i == 0) {
@@ skipping 1144 matching lines @@
   ReplaceEffectUses(node, comparison);
   node->ReplaceInput(0, comparison);
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
   node->TrimInputCount(2);
   NodeProperties::ChangeOp(node, machine()->IntLessThanOrEqual());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8