[turbofan] Further simplify representation inference for NumberTo(U)int32.

test/cctest/compiler/test-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.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <limits>
 
 #include "src/compiler/access-builder.h"
@@ skipping 1027 matching lines @@
   }
 }
 
 
 static void CheckChangeOf(IrOpcode::Value change, Node* of, Node* node) {
   CHECK_EQ(change, node->opcode());
   CHECK_EQ(of, node->InputAt(0));
 }
 
 
-TEST(LowerNumberToInt32_to_nop) {
-  // NumberToInt32(x: kRepTagged | kTypeInt32) used as kRepTagged
-  TestingGraph t(Type::Signed32());
-  Node* trunc = t.graph()->NewNode(t.simplified()->NumberToInt32(), t.p0);
-  Node* use = t.Use(trunc, kRepTagged);
-  t.Return(use);
-  t.Lower();
-  CHECK_EQ(t.p0, use->InputAt(0));
-}
-
-
-TEST(LowerNumberToInt32_to_ChangeTaggedToFloat64) {
-  // NumberToInt32(x: kRepTagged | kTypeInt32) used as kRepFloat64
-  TestingGraph t(Type::Signed32());
-  Node* trunc = t.graph()->NewNode(t.simplified()->NumberToInt32(), t.p0);
-  Node* use = t.Use(trunc, kRepFloat64);
-  t.Return(use);
-  t.Lower();
-  CheckChangeOf(IrOpcode::kChangeTaggedToFloat64, t.p0, use->InputAt(0));
-}
-
-
 TEST(LowerNumberToInt32_to_ChangeTaggedToInt32) {
   // NumberToInt32(x: kRepTagged | kTypeInt32) used as kRepWord32
   TestingGraph t(Type::Signed32());
   Node* trunc = t.graph()->NewNode(t.simplified()->NumberToInt32(), t.p0);
   Node* use = t.Use(trunc, kTypeInt32);
   t.Return(use);
   t.Lower();
   CheckChangeOf(IrOpcode::kChangeTaggedToInt32, t.p0, use->InputAt(0));
 }
 
@@ skipping 18 matching lines @@
   t.Return(use);
   t.Lower();
   Node* node = use->InputAt(0);
   CHECK_EQ(IrOpcode::kTruncateFloat64ToInt32, node->opcode());
   Node* of = node->InputAt(0);
   CHECK_EQ(IrOpcode::kChangeTaggedToFloat64, of->opcode());
   CHECK_EQ(t.p0, of->InputAt(0));
 }
 
 
-TEST(LowerNumberToUint32_to_nop) {
-  // NumberToUint32(x: kRepTagged | kTypeUint32) used as kRepTagged
-  TestingGraph t(Type::Unsigned32());
-  Node* trunc = t.graph()->NewNode(t.simplified()->NumberToUint32(), t.p0);
-  Node* use = t.Use(trunc, kRepTagged);
-  t.Return(use);
-  t.Lower();
-  CHECK_EQ(t.p0, use->InputAt(0));
-}
-
-
-TEST(LowerNumberToUint32_to_ChangeTaggedToFloat64) {
-  // NumberToUint32(x: kRepTagged | kTypeUint32) used as kRepWord32
-  TestingGraph t(Type::Unsigned32());
-  Node* trunc = t.graph()->NewNode(t.simplified()->NumberToUint32(), t.p0);
-  Node* use = t.Use(trunc, kRepFloat64);
-  t.Return(use);
-  t.Lower();
-  CheckChangeOf(IrOpcode::kChangeTaggedToFloat64, t.p0, use->InputAt(0));
-}
-
-
 TEST(LowerNumberToUint32_to_ChangeTaggedToUint32) {
   // NumberToUint32(x: kRepTagged | kTypeUint32) used as kRepWord32
   TestingGraph t(Type::Unsigned32());
   Node* trunc = t.graph()->NewNode(t.simplified()->NumberToUint32(), t.p0);
   Node* use = t.Use(trunc, kTypeUint32);
   t.Return(use);
   t.Lower();
   CheckChangeOf(IrOpcode::kChangeTaggedToUint32, t.p0, use->InputAt(0));
 }
 
@@ skipping 875 matching lines @@
     t.Return(use);
     t.Lower();
 
     CHECK_EQ(d.expected, OpParameter<MachineType>(phi));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8