[turbofan] Remove Float32 truncation.

src/compiler/representation-change.cc

 // Copyright 2015 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/representation-change.h"
 
 #include <sstream>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/compiler/machine-operator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 const char* Truncation::description() const {
   switch (kind()) {
     case TruncationKind::kNone:
       return "no-value-use";
     case TruncationKind::kBool:
       return "truncate-to-bool";
     case TruncationKind::kWord32:
       return "truncate-to-word32";
     case TruncationKind::kWord64:
       return "truncate-to-word64";
-    case TruncationKind::kFloat32:
-      return "truncate-to-float32";
     case TruncationKind::kFloat64:
       return "truncate-to-float64";
     case TruncationKind::kAny:
       return "no-truncation";
   }
   UNREACHABLE();
   return nullptr;
 }
 
 
 // Partial order for truncations:
 //
 //  kWord64       kAny
 //     ^            ^
 //     \            |
 //      \         kFloat64  <--+
-//       \        ^    ^       |
-//        \       /    |       |
-//         kWord32  kFloat32  kBool
-//               ^     ^      ^
-//               \     |      /
-//                \    |     /
-//                 \   |    /
-//                  \  |   /
-//                   \ |  /
+//       \        ^            |
+//        \       /            |
+//         kWord32           kBool
+//               ^            ^
+//               \            /
+//                \          /
+//                 \        /
+//                  \      /
+//                   \    /
 //                   kNone
 
 // static
 Truncation::TruncationKind Truncation::Generalize(TruncationKind rep1,
                                                   TruncationKind rep2) {
   if (LessGeneral(rep1, rep2)) return rep2;
   if (LessGeneral(rep2, rep1)) return rep1;
   // Handle the generalization of float64-representable values.
   if (LessGeneral(rep1, TruncationKind::kFloat64) &&
       LessGeneral(rep2, TruncationKind::kFloat64)) {
@@ skipping 16 matching lines @@
     case TruncationKind::kNone:
       return true;
     case TruncationKind::kBool:
       return rep2 == TruncationKind::kBool || rep2 == TruncationKind::kAny;
     case TruncationKind::kWord32:
       return rep2 == TruncationKind::kWord32 ||
              rep2 == TruncationKind::kWord64 ||
              rep2 == TruncationKind::kFloat64 || rep2 == TruncationKind::kAny;
     case TruncationKind::kWord64:
       return rep2 == TruncationKind::kWord64;
-    case TruncationKind::kFloat32:
-      return rep2 == TruncationKind::kFloat32 ||
-             rep2 == TruncationKind::kFloat64 || rep2 == TruncationKind::kAny;
     case TruncationKind::kFloat64:
       return rep2 == TruncationKind::kFloat64 || rep2 == TruncationKind::kAny;
     case TruncationKind::kAny:
       return rep2 == TruncationKind::kAny;
   }
   UNREACHABLE();
   return false;
 }
 
 
@@ skipping 886 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8