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v8/test/cctest/compiler/test-representation-change.cc
Sigurd Schneider 0298df882b [turbofan] Add feedback to CheckSmi 
This change is quite invasive, because CheckSmi is lowered
through representation change depending on UseInfo to several
different checked conversion operators. This CL adds feedback
to every checked conversion operator to Int32.

Bug: v8:7127, v8:7204
Change-Id: Icb780e5a69d321c2ec161c3c2a32984bdcf101f1
Reviewed-on: https://chromium-review.googlesource.com/831521
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50167}
2017-12-18 15:52:38 +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 "src/compiler/node-matchers.h"
#include "src/compiler/representation-change.h"
#include "src/objects-inl.h"
#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"
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;
}
Node* Return(Node* input) {
Node* n = graph()->NewNode(common()->Return(), jsgraph()->Int32Constant(0),
input, graph()->start(), graph()->start());
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* use = Return(n);
Node* c = changer()->GetRepresentationFor(n, from, from_type, use,
UseInfo(to, Truncation::None()));
CHECK(changer()->type_error_);
CHECK_EQ(n, c);
}
void CheckNop(MachineRepresentation from, Type* from_type,
MachineRepresentation to) {
Node* n = Parameter(0);
Node* use = Return(n);
Node* c = changer()->GetRepresentationFor(n, from, from_type, use,
UseInfo(to, Truncation::None()));
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_use = r.Return(true_node);
Node* true_bit = r.changer()->GetRepresentationFor(
true_node, MachineRepresentation::kTagged, Type::None(), true_use,
UseInfo(MachineRepresentation::kBit, Truncation::None()));
r.CheckInt32Constant(true_bit, 1);
Node* false_node = r.jsgraph()->FalseConstant();
Node* false_use = r.Return(false_node);
Node* false_bit = r.changer()->GetRepresentationFor(
false_node, MachineRepresentation::kTagged, Type::None(), false_use,
UseInfo(MachineRepresentation::kBit, Truncation::None()));
r.CheckInt32Constant(false_bit, 0);
}
TEST(ToTagged_constant) {
RepresentationChangerTester r;
for (double i : ValueHelper::float64_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kFloat64, Type::None(), use,
UseInfo(MachineRepresentation::kTagged, Truncation::None()));
r.CheckNumberConstant(c, i);
}
for (int i : ValueHelper::int32_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(), use,
UseInfo(MachineRepresentation::kTagged, Truncation::None()));
r.CheckNumberConstant(c, i);
}
for (uint32_t i : ValueHelper::uint32_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(), use,
UseInfo(MachineRepresentation::kTagged, Truncation::None()));
r.CheckNumberConstant(c, i);
}
}
TEST(ToFloat64_constant) {
RepresentationChangerTester r;
for (double i : ValueHelper::float64_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::None(), use,
UseInfo(MachineRepresentation::kFloat64, Truncation::None()));
r.CheckFloat64Constant(c, i);
}
for (int i : ValueHelper::int32_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(), use,
UseInfo(MachineRepresentation::kFloat64, Truncation::None()));
r.CheckFloat64Constant(c, i);
}
for (uint32_t i : ValueHelper::uint32_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(), use,
UseInfo(MachineRepresentation::kFloat64, Truncation::None()));
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 (double i : ValueHelper::float32_vector()) {
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::None(), use,
UseInfo(MachineRepresentation::kFloat32, Truncation::None()));
r.CheckFloat32Constant(c, i);
}
for (int i : ValueHelper::int32_vector()) {
if (!IsFloat32Int32(i)) continue;
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Signed32(), use,
UseInfo(MachineRepresentation::kFloat32, Truncation::None()));
r.CheckFloat32Constant(c, static_cast<float>(i));
}
for (uint32_t i : ValueHelper::uint32_vector()) {
if (!IsFloat32Uint32(i)) continue;
Node* n = r.jsgraph()->Constant(i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kWord32, Type::Unsigned32(), use,
UseInfo(MachineRepresentation::kFloat32, Truncation::None()));
r.CheckFloat32Constant(c, static_cast<float>(i));
}
}
TEST(ToInt32_constant) {
RepresentationChangerTester r;
{
FOR_INT32_INPUTS(i) {
Node* n = r.jsgraph()->Constant(*i);
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::Signed32(), use,
UseInfo(MachineRepresentation::kWord32, Truncation::None()));
r.CheckInt32Constant(c, *i);
}
}
}
TEST(ToUint32_constant) {
RepresentationChangerTester r;
FOR_UINT32_INPUTS(i) {
Node* n = r.jsgraph()->Constant(static_cast<double>(*i));
Node* use = r.Return(n);
Node* c = r.changer()->GetRepresentationFor(
n, MachineRepresentation::kTagged, Type::Unsigned32(), use,
UseInfo(MachineRepresentation::kWord32, Truncation::None()));
r.CheckUint32Constant(c, *i);
}
}
static void CheckChange(IrOpcode::Value expected, MachineRepresentation from,
Type* from_type, UseInfo use_info) {
RepresentationChangerTester r;
Node* n = r.Parameter();
Node* use = r.Return(n);
Node* c =
r.changer()->GetRepresentationFor(n, from, from_type, use, use_info);
CHECK_NE(c, n);
CHECK_EQ(expected, c->opcode());
CHECK_EQ(n, c->InputAt(0));
if (expected == IrOpcode::kCheckedFloat64ToInt32) {
CheckForMinusZeroMode mode =
from_type->Maybe(Type::MinusZero())
? use_info.minus_zero_check()
: CheckForMinusZeroMode::kDontCheckForMinusZero;
CHECK_EQ(mode, CheckMinusZeroParametersOf(c->op()).mode());
}
}
static void CheckChange(IrOpcode::Value expected, MachineRepresentation from,
Type* from_type, MachineRepresentation to) {
CheckChange(expected, from, from_type, UseInfo(to, Truncation::None()));
}
static void CheckTwoChanges(IrOpcode::Value expected2,
IrOpcode::Value expected1,
MachineRepresentation from, Type* from_type,
MachineRepresentation to) {
RepresentationChangerTester r;
Node* n = r.Parameter();
Node* use = r.Return(n);
Node* c1 = r.changer()->GetRepresentationFor(n, from, from_type, use,
UseInfo(to, Truncation::None()));
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));
}
static void CheckChange(IrOpcode::Value expected, MachineRepresentation from,
Type* from_type, MachineRepresentation to,
UseInfo use_info) {
RepresentationChangerTester r;
Node* n = r.Parameter();
Node* use = r.Return(n);
Node* c =
r.changer()->GetRepresentationFor(n, from, from_type, use, use_info);
CHECK_NE(c, n);
CHECK_EQ(expected, c->opcode());
CHECK_EQ(n, c->InputAt(0));
}
TEST(SingleChanges) {
CheckChange(IrOpcode::kChangeTaggedToBit, MachineRepresentation::kTagged,
Type::Boolean(), MachineRepresentation::kBit);
CheckChange(IrOpcode::kChangeBitToTagged, MachineRepresentation::kBit,
Type::Boolean(), MachineRepresentation::kTagged);
CheckChange(IrOpcode::kChangeInt31ToTaggedSigned,
MachineRepresentation::kWord32, Type::Signed31(),
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::Number(), MachineRepresentation::kTagged);
CheckTwoChanges(IrOpcode::kChangeFloat64ToInt32,
IrOpcode::kChangeInt31ToTaggedSigned,
MachineRepresentation::kFloat64, Type::Signed31(),
MachineRepresentation::kTagged);
CheckTwoChanges(IrOpcode::kChangeFloat64ToInt32,
IrOpcode::kChangeInt32ToTagged,
MachineRepresentation::kFloat64, Type::Signed32(),
MachineRepresentation::kTagged);
CheckTwoChanges(IrOpcode::kChangeFloat64ToUint32,
IrOpcode::kChangeUint32ToTagged,
MachineRepresentation::kFloat64, Type::Unsigned32(),
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::Number(), MachineRepresentation::kFloat64);
CheckChange(IrOpcode::kTruncateTaggedToFloat64,
MachineRepresentation::kTagged, Type::NumberOrUndefined(),
MachineRepresentation::kFloat64);
CheckChange(IrOpcode::kChangeTaggedToFloat64, MachineRepresentation::kTagged,
Type::Signed31(), 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::Number(),
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::Number(),
MachineRepresentation::kTagged);
CheckTwoChanges(IrOpcode::kChangeTaggedToFloat64,
IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kTagged, Type::Number(),
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::Signed32(), MachineRepresentation::kFloat64);
CheckChange(IrOpcode::kChangeFloat64ToInt32, MachineRepresentation::kFloat64,
Type::Signed32(), MachineRepresentation::kWord32);
CheckChange(IrOpcode::kTruncateFloat64ToWord32,
MachineRepresentation::kFloat64, Type::Number(),
MachineRepresentation::kWord32);
CheckChange(IrOpcode::kCheckedTruncateTaggedToWord32,
MachineRepresentation::kTagged, Type::NonInternal(),
MachineRepresentation::kWord32,
UseInfo::CheckedNumberOrOddballAsWord32());
CheckTwoChanges(IrOpcode::kChangeInt32ToFloat64,
IrOpcode::kTruncateFloat64ToFloat32,
MachineRepresentation::kWord32, Type::Signed32(),
MachineRepresentation::kFloat32);
CheckTwoChanges(IrOpcode::kChangeFloat32ToFloat64,
IrOpcode::kTruncateFloat64ToWord32,
MachineRepresentation::kFloat32, Type::Number(),
MachineRepresentation::kWord32);
}
static void TestMinusZeroCheck(IrOpcode::Value expected, Type* from_type) {
RepresentationChangerTester r;
CheckChange(
expected, MachineRepresentation::kFloat64, from_type,
UseInfo::CheckedSignedSmallAsWord32(kDistinguishZeros, VectorSlotPair()));
CheckChange(
expected, MachineRepresentation::kFloat64, from_type,
UseInfo::CheckedSignedSmallAsWord32(kIdentifyZeros, VectorSlotPair()));
CheckChange(expected, MachineRepresentation::kFloat64, from_type,
UseInfo::CheckedSigned32AsWord32(kDistinguishZeros));
CheckChange(expected, MachineRepresentation::kFloat64, from_type,
UseInfo::CheckedSigned32AsWord32(kDistinguishZeros));
}
TEST(MinusZeroCheck) {
TestMinusZeroCheck(IrOpcode::kCheckedFloat64ToInt32, Type::NumberOrOddball());
// PlainNumber cannot be minus zero so the minus zero check should be
// eliminated.
TestMinusZeroCheck(IrOpcode::kCheckedFloat64ToInt32, Type::PlainNumber());
}
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::Number(),
kMachineTypes[i].representation());
}
// 32-bit floats.
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::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;
// Floats cannot be implicitly converted to/from comparison conditions.
r.CheckTypeError(MachineRepresentation::kBit, Type::Number(),
MachineRepresentation::kFloat32);
r.CheckTypeError(MachineRepresentation::kBit, Type::Boolean(),
MachineRepresentation::kFloat32);
// Word64 is internal and shouldn't be implicitly converted.
r.CheckTypeError(MachineRepresentation::kWord64, Type::Internal(),
MachineRepresentation::kTagged);
r.CheckTypeError(MachineRepresentation::kTagged, Type::Number(),
MachineRepresentation::kWord64);
r.CheckTypeError(MachineRepresentation::kTagged, Type::Boolean(),
MachineRepresentation::kWord64);
// Word64 / Word32 shouldn't be implicitly converted.
r.CheckTypeError(MachineRepresentation::kWord64, Type::Internal(),
MachineRepresentation::kWord32);
r.CheckTypeError(MachineRepresentation::kWord32, Type::Number(),
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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