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v8/test/cctest/compiler/test-instruction.cc
Benedikt Meurer ef546d6872 [turbofan, ia32] Fix moves from constant to poison register. 
This makes the moves from constants to the poisoning register
explicit so that the register allocator does not have to burn
a register on it.

Bug: chromium:798964, chromium:820726, v8:7503, v8:7518
Change-Id: Ifc8f9a2f685405dd38fec583bb0e20c3f0320903
Reviewed-on: https://chromium-review.googlesource.com/964202
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51963}
2018-03-15 15:05:08 +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 "src/compiler/code-generator.h"
#include "src/compiler/common-operator.h"
#include "src/compiler/graph.h"
#include "src/compiler/instruction.h"
#include "src/compiler/linkage.h"
#include "src/compiler/machine-operator.h"
#include "src/compiler/node.h"
#include "src/compiler/operator.h"
#include "src/compiler/schedule.h"
#include "src/compiler/scheduler.h"
#include "src/objects-inl.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
namespace compiler {
typedef v8::internal::compiler::Instruction TestInstr;
typedef v8::internal::compiler::InstructionSequence TestInstrSeq;
// A testing helper for the register code abstraction.
class InstructionTester : public HandleAndZoneScope {
public: // We're all friends here.
InstructionTester()
: graph(zone()),
schedule(zone()),
common(zone()),
machine(zone()),
code(nullptr) {}
Graph graph;
Schedule schedule;
CommonOperatorBuilder common;
MachineOperatorBuilder machine;
TestInstrSeq* code;
Zone* zone() { return main_zone(); }
void allocCode() {
if (schedule.rpo_order()->size() == 0) {
// Compute the RPO order.
Scheduler::ComputeSpecialRPO(main_zone(), &schedule);
CHECK_NE(0u, schedule.rpo_order()->size());
}
InstructionBlocks* instruction_blocks =
TestInstrSeq::InstructionBlocksFor(main_zone(), &schedule);
code = new (main_zone())
TestInstrSeq(main_isolate(), main_zone(), instruction_blocks);
}
Node* Int32Constant(int32_t val) {
Node* node = graph.NewNode(common.Int32Constant(val));
schedule.AddNode(schedule.start(), node);
return node;
}
Node* Float64Constant(double val) {
Node* node = graph.NewNode(common.Float64Constant(val));
schedule.AddNode(schedule.start(), node);
return node;
}
Node* Parameter(int32_t which) {
Node* node = graph.NewNode(common.Parameter(which));
schedule.AddNode(schedule.start(), node);
return node;
}
Node* NewNode(BasicBlock* block) {
Node* node = graph.NewNode(common.Int32Constant(111));
schedule.AddNode(block, node);
return node;
}
int NewInstr() {
InstructionCode opcode = static_cast<InstructionCode>(110);
TestInstr* instr = TestInstr::New(zone(), opcode);
return code->AddInstruction(instr);
}
UnallocatedOperand Unallocated(int vreg) {
return UnallocatedOperand(UnallocatedOperand::REGISTER_OR_SLOT, vreg);
}
RpoNumber RpoFor(BasicBlock* block) {
return RpoNumber::FromInt(block->rpo_number());
}
InstructionBlock* BlockAt(BasicBlock* block) {
return code->InstructionBlockAt(RpoFor(block));
}
BasicBlock* GetBasicBlock(int instruction_index) {
const InstructionBlock* block =
code->GetInstructionBlock(instruction_index);
return schedule.rpo_order()->at(block->rpo_number().ToSize());
}
int first_instruction_index(BasicBlock* block) {
return BlockAt(block)->first_instruction_index();
}
int last_instruction_index(BasicBlock* block) {
return BlockAt(block)->last_instruction_index();
}
};
TEST(InstructionBasic) {
InstructionTester R;
for (int i = 0; i < 10; i++) {
R.Int32Constant(i); // Add some nodes to the graph.
}
BasicBlock* last = R.schedule.start();
for (int i = 0; i < 5; i++) {
BasicBlock* block = R.schedule.NewBasicBlock();
R.schedule.AddGoto(last, block);
last = block;
}
R.allocCode();
BasicBlockVector* blocks = R.schedule.rpo_order();
CHECK_EQ(static_cast<int>(blocks->size()), R.code->InstructionBlockCount());
for (auto block : *blocks) {
CHECK_EQ(block->rpo_number(), R.BlockAt(block)->rpo_number().ToInt());
CHECK(!block->loop_end());
}
}
TEST(InstructionGetBasicBlock) {
InstructionTester R;
BasicBlock* b0 = R.schedule.start();
BasicBlock* b1 = R.schedule.NewBasicBlock();
BasicBlock* b2 = R.schedule.NewBasicBlock();
BasicBlock* b3 = R.schedule.end();
R.schedule.AddGoto(b0, b1);
R.schedule.AddGoto(b1, b2);
R.schedule.AddGoto(b2, b3);
R.allocCode();
R.code->StartBlock(R.RpoFor(b0));
int i0 = R.NewInstr();
int i1 = R.NewInstr();
R.code->EndBlock(R.RpoFor(b0));
R.code->StartBlock(R.RpoFor(b1));
int i2 = R.NewInstr();
int i3 = R.NewInstr();
int i4 = R.NewInstr();
int i5 = R.NewInstr();
R.code->EndBlock(R.RpoFor(b1));
R.code->StartBlock(R.RpoFor(b2));
int i6 = R.NewInstr();
int i7 = R.NewInstr();
int i8 = R.NewInstr();
R.code->EndBlock(R.RpoFor(b2));
R.code->StartBlock(R.RpoFor(b3));
R.code->EndBlock(R.RpoFor(b3));
CHECK_EQ(b0, R.GetBasicBlock(i0));
CHECK_EQ(b0, R.GetBasicBlock(i1));
CHECK_EQ(b1, R.GetBasicBlock(i2));
CHECK_EQ(b1, R.GetBasicBlock(i3));
CHECK_EQ(b1, R.GetBasicBlock(i4));
CHECK_EQ(b1, R.GetBasicBlock(i5));
CHECK_EQ(b2, R.GetBasicBlock(i6));
CHECK_EQ(b2, R.GetBasicBlock(i7));
CHECK_EQ(b2, R.GetBasicBlock(i8));
CHECK_EQ(b0, R.GetBasicBlock(R.first_instruction_index(b0)));
CHECK_EQ(b0, R.GetBasicBlock(R.last_instruction_index(b0)));
CHECK_EQ(b1, R.GetBasicBlock(R.first_instruction_index(b1)));
CHECK_EQ(b1, R.GetBasicBlock(R.last_instruction_index(b1)));
CHECK_EQ(b2, R.GetBasicBlock(R.first_instruction_index(b2)));
CHECK_EQ(b2, R.GetBasicBlock(R.last_instruction_index(b2)));
CHECK_EQ(b3, R.GetBasicBlock(R.first_instruction_index(b3)));
CHECK_EQ(b3, R.GetBasicBlock(R.last_instruction_index(b3)));
}
TEST(InstructionIsGapAt) {
InstructionTester R;
BasicBlock* b0 = R.schedule.start();
R.schedule.AddReturn(b0, R.Int32Constant(1));
R.allocCode();
TestInstr* i0 = TestInstr::New(R.zone(), 100);
TestInstr* g = TestInstr::New(R.zone(), 103);
R.code->StartBlock(R.RpoFor(b0));
R.code->AddInstruction(i0);
R.code->AddInstruction(g);
R.code->EndBlock(R.RpoFor(b0));
CHECK_EQ(2, R.code->instructions().size());
}
TEST(InstructionIsGapAt2) {
InstructionTester R;
BasicBlock* b0 = R.schedule.start();
BasicBlock* b1 = R.schedule.end();
R.schedule.AddGoto(b0, b1);
R.schedule.AddReturn(b1, R.Int32Constant(1));
R.allocCode();
TestInstr* i0 = TestInstr::New(R.zone(), 100);
TestInstr* g = TestInstr::New(R.zone(), 103);
R.code->StartBlock(R.RpoFor(b0));
R.code->AddInstruction(i0);
R.code->AddInstruction(g);
R.code->EndBlock(R.RpoFor(b0));
TestInstr* i1 = TestInstr::New(R.zone(), 102);
TestInstr* g1 = TestInstr::New(R.zone(), 104);
R.code->StartBlock(R.RpoFor(b1));
R.code->AddInstruction(i1);
R.code->AddInstruction(g1);
R.code->EndBlock(R.RpoFor(b1));
CHECK_EQ(4, R.code->instructions().size());
}
TEST(InstructionAddGapMove) {
InstructionTester R;
BasicBlock* b0 = R.schedule.start();
R.schedule.AddReturn(b0, R.Int32Constant(1));
R.allocCode();
TestInstr* i0 = TestInstr::New(R.zone(), 100);
TestInstr* g = TestInstr::New(R.zone(), 103);
R.code->StartBlock(R.RpoFor(b0));
R.code->AddInstruction(i0);
R.code->AddInstruction(g);
R.code->EndBlock(R.RpoFor(b0));
CHECK_EQ(2, R.code->instructions().size());
int index = 0;
for (auto instr : R.code->instructions()) {
UnallocatedOperand op1 = R.Unallocated(index++);
UnallocatedOperand op2 = R.Unallocated(index++);
instr->GetOrCreateParallelMove(TestInstr::START, R.zone())
->AddMove(op1, op2);
ParallelMove* move = instr->GetParallelMove(TestInstr::START);
CHECK(move);
CHECK_EQ(1u, move->size());
MoveOperands* cur = move->at(0);
CHECK(op1.Equals(cur->source()));
CHECK(op2.Equals(cur->destination()));
}
}
TEST(InstructionOperands) {
v8::internal::AccountingAllocator allocator;
Zone zone(&allocator, ZONE_NAME);
{
TestInstr* i = TestInstr::New(&zone, 101);
CHECK_EQ(0, static_cast<int>(i->OutputCount()));
CHECK_EQ(0, static_cast<int>(i->InputCount()));
CHECK_EQ(0, static_cast<int>(i->TempCount()));
}
int vreg = 15;
InstructionOperand outputs[] = {
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg)};
InstructionOperand inputs[] = {
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg)};
InstructionOperand temps[] = {
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg),
UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER, vreg)};
for (size_t i = 0; i < arraysize(outputs); i++) {
for (size_t j = 0; j < arraysize(inputs); j++) {
for (size_t k = 0; k < arraysize(temps); k++) {
TestInstr* m =
TestInstr::New(&zone, 101, i, outputs, j, inputs, k, temps);
CHECK(i == m->OutputCount());
CHECK(j == m->InputCount());
CHECK(k == m->TempCount());
for (size_t z = 0; z < i; z++) {
CHECK(outputs[z].Equals(*m->OutputAt(z)));
}
for (size_t z = 0; z < j; z++) {
CHECK(inputs[z].Equals(*m->InputAt(z)));
}
for (size_t z = 0; z < k; z++) {
CHECK(temps[z].Equals(*m->TempAt(z)));
}
}
}
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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