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v8/test/unittests/interpreter/bytecode-peephole-optimizer-unittest.cc
rmcilroy f4f58e31c1 [Interpreter] Optimize code of the form 'if (x === undefined)'. 
Translates code of the form 'if (x === undefined)' into the JumpIfUndefined
bytecode, and similarly for comparisons with null. Also adds bytecodes for
JumpIfNotUndefined / Null.

Moves the peephole optimization for CompareUndefined out of the peephole
optimizer and into the BytecodeGenerator, having the side-effect of enabling
it for comparisons with undefined on both side of the compare operation.

BUG=v8:6107

Review-Url: https://codereview.chromium.org/2793923002
Cr-Commit-Position: refs/heads/master@{#44341}
2017-04-03 14:17:16 +00:00

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// Copyright 2016 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/v8.h"
#include "src/factory.h"
#include "src/interpreter/bytecode-label.h"
#include "src/interpreter/bytecode-peephole-optimizer.h"
#include "src/objects-inl.h"
#include "src/objects.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodePeepholeOptimizerTest : public BytecodePipelineStage,
public TestWithIsolateAndZone {
public:
BytecodePeepholeOptimizerTest()
: peephole_optimizer_(this),
last_written_(BytecodeNode::Illegal(BytecodeSourceInfo())) {}
~BytecodePeepholeOptimizerTest() override {}
void Reset() {
last_written_ = BytecodeNode::Illegal(BytecodeSourceInfo());
write_count_ = 0;
}
void Write(BytecodeNode* node) override {
write_count_++;
last_written_ = *node;
}
void WriteJump(BytecodeNode* node, BytecodeLabel* label) override {
write_count_++;
last_written_ = *node;
}
void BindLabel(BytecodeLabel* label) override {}
void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override {}
Handle<BytecodeArray> ToBytecodeArray(
Isolate* isolate, int fixed_register_count, int parameter_count,
Handle<FixedArray> handle_table) override {
return Handle<BytecodeArray>();
}
void Flush() {
optimizer()->ToBytecodeArray(isolate(), 0, 0,
factory()->empty_fixed_array());
}
BytecodePeepholeOptimizer* optimizer() { return &peephole_optimizer_; }
int write_count() const { return write_count_; }
const BytecodeNode& last_written() const { return last_written_; }
private:
BytecodePeepholeOptimizer peephole_optimizer_;
int write_count_ = 0;
BytecodeNode last_written_;
};
// Sanity tests.
TEST_F(BytecodePeepholeOptimizerTest, FlushOnJump) {
CHECK_EQ(write_count(), 0);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand(), 1);
optimizer()->Write(&add);
CHECK_EQ(write_count(), 0);
BytecodeLabel target;
BytecodeNode jump(Bytecode::kJump, 0);
optimizer()->WriteJump(&jump, &target);
CHECK_EQ(write_count(), 2);
CHECK_EQ(jump, last_written());
}
TEST_F(BytecodePeepholeOptimizerTest, FlushOnBind) {
CHECK_EQ(write_count(), 0);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand(), 1);
optimizer()->Write(&add);
CHECK_EQ(write_count(), 0);
BytecodeLabel target;
optimizer()->BindLabel(&target);
CHECK_EQ(write_count(), 1);
CHECK_EQ(add, last_written());
}
// Nop elimination tests.
TEST_F(BytecodePeepholeOptimizerTest, ElideEmptyNop) {
BytecodeNode nop(Bytecode::kNop);
optimizer()->Write(&nop);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand(), 1);
optimizer()->Write(&add);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(add, last_written());
}
TEST_F(BytecodePeepholeOptimizerTest, ElideExpressionNop) {
BytecodeSourceInfo source_info(3, false);
BytecodeNode nop(Bytecode::kNop, source_info);
optimizer()->Write(&nop);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand(), 1);
optimizer()->Write(&add);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(add, last_written());
}
TEST_F(BytecodePeepholeOptimizerTest, KeepStatementNop) {
BytecodeSourceInfo source_info_statement(3, true);
BytecodeNode nop(Bytecode::kNop, source_info_statement);
optimizer()->Write(&nop);
BytecodeSourceInfo source_info_expression(3, false);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand(), 1,
source_info_expression);
optimizer()->Write(&add);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(add, last_written());
}
// Tests covering BytecodePeepholeOptimizer::UpdateCurrentBytecode().
TEST_F(BytecodePeepholeOptimizerTest, KeepJumpIfToBooleanTrue) {
BytecodeNode first(Bytecode::kLdaNull);
BytecodeNode second(Bytecode::kJumpIfToBooleanTrue, 3);
BytecodeLabel label;
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->WriteJump(&second, &label);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, ElideJumpIfToBooleanTrue) {
BytecodeNode first(Bytecode::kLdaTrue);
BytecodeNode second(Bytecode::kJumpIfToBooleanTrue, 3);
BytecodeLabel label;
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->WriteJump(&second, &label);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, KeepToBooleanLogicalNot) {
BytecodeNode first(Bytecode::kLdaNull);
BytecodeNode second(Bytecode::kToBooleanLogicalNot);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, ElideToBooleanLogicalNot) {
BytecodeNode first(Bytecode::kLdaTrue);
BytecodeNode second(Bytecode::kToBooleanLogicalNot);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLogicalNot);
}
// Tests covering BytecodePeepholeOptimizer::CanElideCurrent().
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRy) {
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kLdar, Register(1).ToOperand());
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRx) {
BytecodeLabel label;
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kLdar, Register(0).ToOperand());
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
}
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRxStatement) {
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeSourceInfo source_info(3, true);
BytecodeNode second(Bytecode::kLdar, Register(0).ToOperand(), source_info);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kNop);
CHECK_EQ(last_written().source_info(), source_info);
}
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRxStatementStarRy) {
BytecodeLabel label;
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeSourceInfo source_info(0, true);
BytecodeNode second(Bytecode::kLdar, Register(0).ToOperand(), source_info);
BytecodeNode third(Bytecode::kStar, Register(3).ToOperand());
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
optimizer()->Write(&third);
CHECK_EQ(write_count(), 1);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), third);
}
TEST_F(BytecodePeepholeOptimizerTest, LdarToName) {
BytecodeNode first(Bytecode::kLdar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kToName, Register(0).ToOperand());
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, TypeOfToName) {
BytecodeNode first(Bytecode::kTypeOf);
BytecodeNode second(Bytecode::kToName, Register(0).ToOperand());
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
CHECK_EQ(last_written().bytecode(), Bytecode::kStar);
}
// Tests covering BytecodePeepholeOptimizer::CanElideLast().
TEST_F(BytecodePeepholeOptimizerTest, LdaTrueLdaFalse) {
BytecodeNode first(Bytecode::kLdaTrue);
BytecodeNode second(Bytecode::kLdaFalse);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, LdaTrueStatementLdaFalse) {
BytecodeSourceInfo source_info(3, true);
BytecodeNode first(Bytecode::kLdaTrue, source_info);
BytecodeNode second(Bytecode::kLdaFalse);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), second);
CHECK(second.source_info().is_statement());
CHECK_EQ(second.source_info().source_position(), 3);
}
TEST_F(BytecodePeepholeOptimizerTest, NopStackCheck) {
BytecodeNode first(Bytecode::kNop);
BytecodeNode second(Bytecode::kStackCheck);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, NopStatementStackCheck) {
BytecodeSourceInfo source_info(3, true);
BytecodeNode first(Bytecode::kNop, source_info);
BytecodeNode second(Bytecode::kStackCheck);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
BytecodeNode expected(Bytecode::kStackCheck, source_info);
CHECK_EQ(last_written(), expected);
}
// Tests covering BytecodePeepholeOptimizer::UpdateLastAndCurrentBytecodes().
TEST_F(BytecodePeepholeOptimizerTest, MergeLdaSmiWithBinaryOp) {
Bytecode operator_replacement_pairs[][2] = {
{Bytecode::kAdd, Bytecode::kAddSmi},
{Bytecode::kSub, Bytecode::kSubSmi},
{Bytecode::kBitwiseAnd, Bytecode::kBitwiseAndSmi},
{Bytecode::kBitwiseOr, Bytecode::kBitwiseOrSmi},
{Bytecode::kShiftLeft, Bytecode::kShiftLeftSmi},
{Bytecode::kShiftRight, Bytecode::kShiftRightSmi}};
for (auto operator_replacement : operator_replacement_pairs) {
uint32_t imm_operand = 17;
BytecodeSourceInfo source_info(3, true);
BytecodeNode first(Bytecode::kLdaSmi, imm_operand, source_info);
uint32_t reg_operand = Register(0).ToOperand();
uint32_t idx_operand = 1;
BytecodeNode second(operator_replacement[0], reg_operand, idx_operand);
optimizer()->Write(&first);
optimizer()->Write(&second);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), operator_replacement[1]);
CHECK_EQ(last_written().operand_count(), 3);
CHECK_EQ(last_written().operand(0), imm_operand);
CHECK_EQ(last_written().operand(1), reg_operand);
CHECK_EQ(last_written().operand(2), idx_operand);
CHECK_EQ(last_written().source_info(), source_info);
Reset();
}
}
TEST_F(BytecodePeepholeOptimizerTest, NotMergingLdaSmiWithBinaryOp) {
Bytecode operator_replacement_pairs[][2] = {
{Bytecode::kAdd, Bytecode::kAddSmi},
{Bytecode::kSub, Bytecode::kSubSmi},
{Bytecode::kBitwiseAnd, Bytecode::kBitwiseAndSmi},
{Bytecode::kBitwiseOr, Bytecode::kBitwiseOrSmi},
{Bytecode::kShiftLeft, Bytecode::kShiftLeftSmi},
{Bytecode::kShiftRight, Bytecode::kShiftRightSmi}};
for (auto operator_replacement : operator_replacement_pairs) {
uint32_t imm_operand = 17;
BytecodeSourceInfo source_info(3, true);
BytecodeNode first(Bytecode::kLdaSmi, imm_operand, source_info);
uint32_t reg_operand = Register(0).ToOperand();
source_info.MakeStatementPosition(4);
BytecodeNode second(operator_replacement[0], reg_operand, 1, source_info);
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(last_written(), second);
Reset();
}
}
TEST_F(BytecodePeepholeOptimizerTest, MergeLdaZeroWithBinaryOp) {
Bytecode operator_replacement_pairs[][2] = {
{Bytecode::kAdd, Bytecode::kAddSmi},
{Bytecode::kSub, Bytecode::kSubSmi},
{Bytecode::kBitwiseAnd, Bytecode::kBitwiseAndSmi},
{Bytecode::kBitwiseOr, Bytecode::kBitwiseOrSmi},
{Bytecode::kShiftLeft, Bytecode::kShiftLeftSmi},
{Bytecode::kShiftRight, Bytecode::kShiftRightSmi}};
for (auto operator_replacement : operator_replacement_pairs) {
BytecodeNode first(Bytecode::kLdaZero);
uint32_t reg_operand = Register(0).ToOperand();
uint32_t idx_operand = 1;
BytecodeNode second(operator_replacement[0], reg_operand, idx_operand);
optimizer()->Write(&first);
optimizer()->Write(&second);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), operator_replacement[1]);
CHECK_EQ(last_written().operand_count(), 3);
CHECK_EQ(last_written().operand(0), 0u);
CHECK_EQ(last_written().operand(1), reg_operand);
CHECK_EQ(last_written().operand(2), idx_operand);
Reset();
}
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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