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v8/test/cctest/compiler/test-representation-change.cc
ahaas a5d4188849 x87: fix the use of CheckFloatEq and CheckDoubleEq in test. 
Instead of using CheckFloatEq and CheckDoubleEq directly, I introduced
a macro which first stores the expected result in a volatile variable.

Here are some comments of previous CLs:

The reason is same as the CL #31808 (issue 1430943002, X87: Change the test case for X87 float operations), please refer: https://codereview.chromium.org/1430943002/.

  Here is the key comments from CL #31808
  Some new test cases use CheckFloatEq(...) and CheckDoubleEq(...) function for result check. When GCC compiling the CheckFloatEq() and CheckDoubleEq() function,
  those inlined functions has different behavior comparing with GCC ia32 build and x87 build.
  The major difference is sse float register still has single precision rounding semantic. While X87 register has no such rounding precsion semantic when directly use register value.
  The V8 turbofan JITTed has exactly same result in both X87 and IA32 port.

  So we add the following sentence to do type cast to keep the same precision for RunCallInt64ToFloat32/RunCallInt64ToFloat64. Such as: volatile double expect = static_cast<float>(*i).

R=titzer@chromium.org, weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/1773513002

Cr-Commit-Position: refs/heads/master@{#34534}
2016-03-07 12:30:23 +00:00

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// 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 <limits>
#include "test/cctest/cctest.h"
#include "test/cctest/compiler/codegen-tester.h"
#include "test/cctest/compiler/graph-builder-tester.h"
#include "test/cctest/compiler/value-helper.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/representation-change.h"
namespace v8 {
namespace internal {
namespace compiler {
class RepresentationChangerTester : public HandleAndZoneScope,
public GraphAndBuilders {
public:
explicit RepresentationChangerTester(int num_parameters = 0)
: GraphAndBuilders(main_zone()),
javascript_(main_zone()),
jsgraph_(main_isolate(), main_graph_, &main_common_, &javascript_,
&main_simplified_, &main_machine_),
changer_(&jsgraph_, main_isolate()) {
Node* s = graph()->NewNode(common()->Start(num_parameters));
graph()->SetStart(s);
}
JSOperatorBuilder javascript_;
JSGraph jsgraph_;
RepresentationChanger changer_;
Isolate* isolate() { return main_isolate(); }
Graph* graph() { return main_graph_; }
CommonOperatorBuilder* common() { return &main_common_; }
JSGraph* jsgraph() { return &jsgraph_; }
RepresentationChanger* changer() { return &changer_; }
// TODO(titzer): use ValueChecker / ValueUtil
void CheckInt32Constant(Node* n, int32_t expected) {
Int32Matcher m(n);
CHECK(m.HasValue());
CHECK_EQ(expected, m.Value());
}
void CheckUint32Constant(Node* n, uint32_t expected) {
Uint32Matcher m(n);
CHECK(m.HasValue());
CHECK_EQ(static_cast<int>(expected), static_cast<int>(m.Value()));
}
void CheckFloat64Constant(Node* n, double expected) {
Float64Matcher m(n);
CHECK(m.HasValue());
CHECK_DOUBLE_EQ(expected, m.Value());
}
void CheckFloat32Constant(Node* n, float expected) {
CHECK_EQ(IrOpcode::kFloat32Constant, n->opcode());
float fval = OpParameter<float>(n->op());
CHECK_FLOAT_EQ(expected, fval);
}
void CheckHeapConstant(Node* n, HeapObject* expected) {
HeapObjectMatcher m(n);
CHECK(m.HasValue());
CHECK_EQ(expected, *m.Value());
}
void CheckNumberConstant(Node* n, double expected) {
NumberMatcher m(n);
CHECK_EQ(IrOpcode::kNumberConstant, n->opcode());
CHECK(m.HasValue());
CHECK_DOUBLE_EQ(expected, m.Value());
}
Node* Parameter(int index = 0) {
Node* n = graph()->NewNode(common()->Parameter(index), graph()->start());
NodeProperties::SetType(n, Type::Any());
return n;
}
void CheckTypeError(MachineRepresentation from, Type* from_type,
MachineRepresentation to) {
changer()->testing_type_errors_ = true;
changer()->type_error_ = false;
Node* n = Parameter(0);
Node* c = changer()->GetRepresentationFor(n, from, from_type, to);
CHECK(changer()->type_error_);
CHECK_EQ(n, c);
}
void CheckNop(MachineRepresentation from, Type* from_type,
MachineRepresentation to) {
Node* n = Parameter(0);
Node* c = changer()->GetRepresentationFor(n, from, from_type, to);
CHECK_EQ(n, c);
}
};
const MachineType kMachineTypes[] = {
MachineType::Float32(), MachineType::Float64(), MachineType::Int8(),
MachineType::Uint8(), MachineType::Int16(), MachineType::Uint16(),
MachineType::Int32(), MachineType::Uint32(), MachineType::Int64(),
MachineType::Uint64(), MachineType::AnyTagged()};
TEST(BoolToBit_constant) {
RepresentationChangerTester r;
Node* true_node = r.jsgraph()->TrueConstant();
Node* true_bit = r.changer()->GetRepresentationFor(
true_node, MachineRepresentation::kTagged, Type::None(),
MachineRepresentation::kBit);
r.CheckInt32Constant(true_bit, 1);
Node* false_node = r.jsgraph()->FalseConstant();
Node* false_bit = r.changer()->GetRepresentationFor(
false_node, MachineRepresentation::kTagged, Type::None(),
MachineRepresentation::kBit);
r.CheckInt32Constant(false_bit, 0);
}
TEST(BitToBool_constant) {
RepresentationChangerTester r;
for (int i = -5; i < 5; i++) {
Node* node = r.jsgraph()->Int32Constant(i);
Node* val = r.changer()->GetRepresentationFor(
node, MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kTagged);
r.CheckHeapConstant(val, i == 0 ? r.isolate()->heap()->false_value()
: r.isolate()->heap()->true_value());
}
}
TEST(ToTagged_constant) {
RepresentationChangerTester r;
{
FOR_FLOAT64_INPUTS(i) {
Node* n = r.jsgraph()->Float64Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::None(),
MachineRepresentation::kTagged);
r.CheckNumberConstant(c, *i);
}
}
{
FOR_FLOAT64_INPUTS(i) {
Node* n = r.jsgraph()->Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::None(),
MachineRepresentation::kTagged);
r.CheckNumberConstant(c, *i);
}
}
{
FOR_FLOAT32_INPUTS(i) {
Node* n = r.jsgraph()->Float32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat32, Type::None(),
MachineRepresentation::kTagged);
r.CheckNumberConstant(c, *i);
}
}
{
FOR_INT32_INPUTS(i) {
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kTagged);
r.CheckNumberConstant(c, *i);
}
}
{
FOR_UINT32_INPUTS(i) {
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(),
MachineRepresentation::kTagged);
r.CheckNumberConstant(c, *i);
}
}
}
TEST(ToFloat64_constant) {
RepresentationChangerTester r;
{
FOR_FLOAT64_INPUTS(i) {
Node* n = r.jsgraph()->Float64Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::None(),
MachineRepresentation::kFloat64);
CHECK_EQ(n, c);
}
}
{
FOR_FLOAT64_INPUTS(i) {
Node* n = r.jsgraph()->Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::None(),
MachineRepresentation::kFloat64);
r.CheckFloat64Constant(c, *i);
}
}
{
FOR_FLOAT32_INPUTS(i) {
Node* n = r.jsgraph()->Float32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat32, Type::None(),
MachineRepresentation::kFloat64);
r.CheckFloat64Constant(c, *i);
}
}
{
FOR_INT32_INPUTS(i) {
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kFloat64);
r.CheckFloat64Constant(c, *i);
}
}
{
FOR_UINT32_INPUTS(i) {
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(),
MachineRepresentation::kFloat64);
r.CheckFloat64Constant(c, *i);
}
}
}
static bool IsFloat32Int32(int32_t val) {
return val >= -(1 << 23) && val <= (1 << 23);
}
static bool IsFloat32Uint32(uint32_t val) { return val <= (1 << 23); }
TEST(ToFloat32_constant) {
RepresentationChangerTester r;
{
FOR_FLOAT32_INPUTS(i) {
Node* n = r.jsgraph()->Float32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat32, Type::None(),
MachineRepresentation::kFloat32);
CHECK_EQ(n, c);
}
}
{
FOR_FLOAT32_INPUTS(i) {
Node* n = r.jsgraph()->Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::None(),
MachineRepresentation::kFloat32);
r.CheckFloat32Constant(c, *i);
}
}
{
FOR_FLOAT32_INPUTS(i) {
Node* n = r.jsgraph()->Float64Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::None(),
MachineRepresentation::kFloat32);
r.CheckFloat32Constant(c, *i);
}
}
{
FOR_INT32_INPUTS(i) {
if (!IsFloat32Int32(*i)) continue;
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kFloat32);
r.CheckFloat32Constant(c, static_cast<float>(*i));
}
}
{
FOR_UINT32_INPUTS(i) {
if (!IsFloat32Uint32(*i)) continue;
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(),
MachineRepresentation::kFloat32);
r.CheckFloat32Constant(c, static_cast<float>(*i));
}
}
}
TEST(ToInt32_constant) {
RepresentationChangerTester r;
{
FOR_INT32_INPUTS(i) {
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kWord32);
r.CheckInt32Constant(c, *i);
}
}
{
FOR_INT32_INPUTS(i) {
if (!IsFloat32Int32(*i)) continue;
Node* n = r.jsgraph()->Float32Constant(static_cast<float>(*i));
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat32, Type::Signed32(),
MachineRepresentation::kWord32);
r.CheckInt32Constant(c, *i);
}
}
{
FOR_INT32_INPUTS(i) {
Node* n = r.jsgraph()->Float64Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::Signed32(),
MachineRepresentation::kWord32);
r.CheckInt32Constant(c, *i);
}
}
{
FOR_INT32_INPUTS(i) {
Node* n = r.jsgraph()->Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::Signed32(),
MachineRepresentation::kWord32);
r.CheckInt32Constant(c, *i);
}
}
}
TEST(ToUint32_constant) {
RepresentationChangerTester r;
{
FOR_UINT32_INPUTS(i) {
Node* n = r.jsgraph()->Int32Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(),
MachineRepresentation::kWord32);
r.CheckUint32Constant(c, *i);
}
}
{
FOR_UINT32_INPUTS(i) {
if (!IsFloat32Uint32(*i)) continue;
Node* n = r.jsgraph()->Float32Constant(static_cast<float>(*i));
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat32, Type::Unsigned32(),
MachineRepresentation::kWord32);
r.CheckUint32Constant(c, *i);
}
}
{
FOR_UINT32_INPUTS(i) {
Node* n = r.jsgraph()->Float64Constant(*i);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::Unsigned32(),
MachineRepresentation::kWord32);
r.CheckUint32Constant(c, *i);
}
}
{
FOR_UINT32_INPUTS(i) {
Node* n = r.jsgraph()->Constant(static_cast<double>(*i));
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::Unsigned32(),
MachineRepresentation::kWord32);
r.CheckUint32Constant(c, *i);
}
}
}
static void CheckChange(IrOpcode::Value expected, MachineRepresentation from,
Type* from_type, MachineRepresentation to) {
RepresentationChangerTester r;
Node* n = r.Parameter();
Node* c = r.changer()->GetRepresentationFor(n, from, from_type, to);
CHECK_NE(c, n);
CHECK_EQ(expected, c->opcode());
CHECK_EQ(n, c->InputAt(0));
}
static void CheckTwoChanges(IrOpcode::Value expected2,
IrOpcode::Value expected1,
MachineRepresentation from, Type* from_type,
MachineRepresentation to) {
RepresentationChangerTester r;
Node* n = r.Parameter();
Node* c1 = r.changer()->GetRepresentationFor(n, from, from_type, to);
CHECK_NE(c1, n);
CHECK_EQ(expected1, c1->opcode());
Node* c2 = c1->InputAt(0);
CHECK_NE(c2, n);
CHECK_EQ(expected2, c2->opcode());
CHECK_EQ(n, c2->InputAt(0));
}
TEST(SingleChanges) {
CheckChange(IrOpcode::kChangeBoolToBit, MachineRepresentation::kTagged,
Type::None(), MachineRepresentation::kBit);
CheckChange(IrOpcode::kChangeBitToBool, MachineRepresentation::kBit,
Type::None(), MachineRepresentation::kTagged);
CheckChange(IrOpcode::kChangeInt32ToTagged, MachineRepresentation::kWord32,
Type::Signed32(), MachineRepresentation::kTagged);
CheckChange(IrOpcode::kChangeUint32ToTagged, MachineRepresentation::kWord32,
Type::Unsigned32(), MachineRepresentation::kTagged);
CheckChange(IrOpcode::kChangeFloat64ToTagged, MachineRepresentation::kFloat64,
Type::None(), MachineRepresentation::kTagged);
CheckChange(IrOpcode::kChangeTaggedToInt32, MachineRepresentation::kTagged,
Type::Signed32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kChangeTaggedToUint32, MachineRepresentation::kTagged,
Type::Unsigned32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kChangeTaggedToFloat64, MachineRepresentation::kTagged,
Type::None(), MachineRepresentation::kFloat64);
// Int32,Uint32 <-> Float64 are actually machine conversions.
CheckChange(IrOpcode::kChangeInt32ToFloat64, MachineRepresentation::kWord32,
Type::Signed32(), MachineRepresentation::kFloat64);
CheckChange(IrOpcode::kChangeUint32ToFloat64, MachineRepresentation::kWord32,
Type::Unsigned32(), MachineRepresentation::kFloat64);
CheckChange(IrOpcode::kChangeFloat64ToInt32, MachineRepresentation::kFloat64,
Type::Signed32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kChangeFloat64ToUint32, MachineRepresentation::kFloat64,
Type::Unsigned32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kFloat64, Type::None(),
MachineRepresentation::kFloat32);
// Int32,Uint32 <-> Float32 require two changes.
CheckTwoChanges(IrOpcode::kChangeInt32ToFloat64,
IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kFloat32);
CheckTwoChanges(IrOpcode::kChangeUint32ToFloat64,
IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kWord32, Type::Unsigned32(),
MachineRepresentation::kFloat32);
CheckTwoChanges(IrOpcode::kChangeFloat32ToFloat64,
IrOpcode::kChangeFloat64ToInt32,
MachineRepresentation::kFloat32, Type::Signed32(),
MachineRepresentation::kWord32);
CheckTwoChanges(IrOpcode::kChangeFloat32ToFloat64,
IrOpcode::kChangeFloat64ToUint32,
MachineRepresentation::kFloat32, Type::Unsigned32(),
MachineRepresentation::kWord32);
// Float32 <-> Tagged require two changes.
CheckTwoChanges(IrOpcode::kChangeFloat32ToFloat64,
IrOpcode::kChangeFloat64ToTagged,
MachineRepresentation::kFloat32, Type::None(),
MachineRepresentation::kTagged);
CheckTwoChanges(IrOpcode::kChangeTaggedToFloat64,
IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kTagged, Type::None(),
MachineRepresentation::kFloat32);
}
TEST(SignednessInWord32) {
RepresentationChangerTester r;
CheckChange(IrOpcode::kChangeTaggedToInt32, MachineRepresentation::kTagged,
Type::Signed32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kChangeTaggedToUint32, MachineRepresentation::kTagged,
Type::Unsigned32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kChangeInt32ToFloat64, MachineRepresentation::kWord32,
Type::None(), MachineRepresentation::kFloat64);
CheckChange(IrOpcode::kChangeFloat64ToInt32, MachineRepresentation::kFloat64,
Type::Signed32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kTruncateFloat64ToInt32,
MachineRepresentation::kFloat64, Type::Number(),
MachineRepresentation::kWord32);
CheckTwoChanges(IrOpcode::kChangeInt32ToFloat64,
IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kWord32, Type::None(),
MachineRepresentation::kFloat32);
CheckTwoChanges(IrOpcode::kChangeFloat32ToFloat64,
IrOpcode::kTruncateFloat64ToInt32,
MachineRepresentation::kFloat32, Type::Number(),
MachineRepresentation::kWord32);
}
TEST(Nops) {
RepresentationChangerTester r;
// X -> X is always a nop for any single representation X.
for (size_t i = 0; i < arraysize(kMachineTypes); i++) {
r.CheckNop(kMachineTypes[i].representation(), Type::None(),
kMachineTypes[i].representation());
}
// 32-bit floats.
r.CheckNop(MachineRepresentation::kFloat32, Type::None(),
MachineRepresentation::kFloat32);
r.CheckNop(MachineRepresentation::kFloat32, Type::Number(),
MachineRepresentation::kFloat32);
// 32-bit words can be used as smaller word sizes and vice versa, because
// loads from memory implicitly sign or zero extend the value to the
// full machine word size, and stores implicitly truncate.
r.CheckNop(MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kWord8);
r.CheckNop(MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kWord16);
r.CheckNop(MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kWord32);
r.CheckNop(MachineRepresentation::kWord8, Type::Signed32(),
MachineRepresentation::kWord32);
r.CheckNop(MachineRepresentation::kWord16, Type::Signed32(),
MachineRepresentation::kWord32);
// kRepBit (result of comparison) is implicitly a wordish thing.
r.CheckNop(MachineRepresentation::kBit, Type::None(),
MachineRepresentation::kWord8);
r.CheckNop(MachineRepresentation::kBit, Type::None(),
MachineRepresentation::kWord16);
r.CheckNop(MachineRepresentation::kBit, Type::None(),
MachineRepresentation::kWord32);
r.CheckNop(MachineRepresentation::kBit, Type::None(),
MachineRepresentation::kWord64);
r.CheckNop(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kWord8);
r.CheckNop(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kWord16);
r.CheckNop(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kWord32);
r.CheckNop(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kWord64);
}
TEST(TypeErrors) {
RepresentationChangerTester r;
// Wordish cannot be implicitly converted to/from comparison conditions.
r.CheckTypeError(MachineRepresentation::kWord8, Type::None(),
MachineRepresentation::kBit);
r.CheckTypeError(MachineRepresentation::kWord16, Type::None(),
MachineRepresentation::kBit);
r.CheckTypeError(MachineRepresentation::kWord32, Type::None(),
MachineRepresentation::kBit);
r.CheckTypeError(MachineRepresentation::kWord64, Type::None(),
MachineRepresentation::kBit);
// Floats cannot be implicitly converted to/from comparison conditions.
r.CheckTypeError(MachineRepresentation::kFloat64, Type::None(),
MachineRepresentation::kBit);
r.CheckTypeError(MachineRepresentation::kBit, Type::None(),
MachineRepresentation::kFloat64);
r.CheckTypeError(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kFloat64);
// Floats cannot be implicitly converted to/from comparison conditions.
r.CheckTypeError(MachineRepresentation::kFloat32, Type::None(),
MachineRepresentation::kBit);
r.CheckTypeError(MachineRepresentation::kBit, Type::None(),
MachineRepresentation::kFloat32);
r.CheckTypeError(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kFloat32);
// Word64 is internal and shouldn't be implicitly converted.
r.CheckTypeError(MachineRepresentation::kWord64, Type::None(),
MachineRepresentation::kTagged);
r.CheckTypeError(MachineRepresentation::kTagged, Type::None(),
MachineRepresentation::kWord64);
r.CheckTypeError(MachineRepresentation::kTagged, Type::Boolean(),
MachineRepresentation::kWord64);
// Word64 / Word32 shouldn't be implicitly converted.
r.CheckTypeError(MachineRepresentation::kWord64, Type::None(),
MachineRepresentation::kWord32);
r.CheckTypeError(MachineRepresentation::kWord32, Type::None(),
MachineRepresentation::kWord64);
r.CheckTypeError(MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kWord64);
r.CheckTypeError(MachineRepresentation::kWord32, Type::Unsigned32(),
MachineRepresentation::kWord64);
}
} // namespace compiler
} // namespace internal
} // namespace v8
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