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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/codegen/tick-counter.h"
#include "src/compiler/access-builder.h"
#include "src/compiler/common-operator.h"
#include "src/compiler/graph-visualizer.h"
#include "src/compiler/graph.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/js-operator.h"
#include "src/compiler/loop-analysis.h"
#include "src/compiler/node.h"
#include "src/compiler/opcodes.h"
#include "src/compiler/operator.h"
#include "src/compiler/schedule.h"
#include "src/compiler/scheduler.h"
#include "src/compiler/simplified-operator.h"
#include "src/compiler/verifier.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
namespace compiler {
static Operator kIntAdd(IrOpcode::kInt32Add, Operator::kPure, "Int32Add", 2, 0,
0, 1, 0, 0);
static Operator kIntLt(IrOpcode::kInt32LessThan, Operator::kPure,
"Int32LessThan", 2, 0, 0, 1, 0, 0);
static Operator kStore(IrOpcode::kStore, Operator::kNoProperties, "Store", 1, 1,
1, 0, 1, 0);
static const int kNumLeafs = 4;
// A helper for all tests dealing with LoopFinder.
class LoopFinderTester : HandleAndZoneScope {
public:
LoopFinderTester()
: HandleAndZoneScope(kCompressGraphZone),
isolate(main_isolate()),
common(main_zone()),
graph(main_zone()),
jsgraph(main_isolate(), &graph, &common, nullptr, nullptr, nullptr),
start(graph.NewNode(common.Start(1))),
end(graph.NewNode(common.End(1), start)),
p0(graph.NewNode(common.Parameter(0), start)),
zero(jsgraph.Int32Constant(0)),
one(jsgraph.OneConstant()),
half(jsgraph.Constant(0.5)),
self(graph.NewNode(common.Int32Constant(0xAABBCCDD))),
dead(graph.NewNode(common.Dead())),
loop_tree(nullptr) {
graph.SetEnd(end);
graph.SetStart(start);
leaf[0] = zero;
leaf[1] = one;
leaf[2] = half;
leaf[3] = p0;
}
Isolate* isolate;
TickCounter tick_counter;
CommonOperatorBuilder common;
Graph graph;
JSGraph jsgraph;
Node* start;
Node* end;
Node* p0;
Node* zero;
Node* one;
Node* half;
Node* self;
Node* dead;
Node* leaf[kNumLeafs];
LoopTree* loop_tree;
Node* Phi(Node* a) {
return SetSelfReferences(graph.NewNode(op(1, false), a, start));
}
Node* Phi(Node* a, Node* b) {
return SetSelfReferences(graph.NewNode(op(2, false), a, b, start));
}
Node* Phi(Node* a, Node* b, Node* c) {
return SetSelfReferences(graph.NewNode(op(3, false), a, b, c, start));
}
Node* Phi(Node* a, Node* b, Node* c, Node* d) {
return SetSelfReferences(graph.NewNode(op(4, false), a, b, c, d, start));
}
Node* EffectPhi(Node* a) {
return SetSelfReferences(graph.NewNode(op(1, true), a, start));
}
Node* EffectPhi(Node* a, Node* b) {
return SetSelfReferences(graph.NewNode(op(2, true), a, b, start));
}
Node* EffectPhi(Node* a, Node* b, Node* c) {
return SetSelfReferences(graph.NewNode(op(3, true), a, b, c, start));
}
Node* EffectPhi(Node* a, Node* b, Node* c, Node* d) {
return SetSelfReferences(graph.NewNode(op(4, true), a, b, c, d, start));
}
Node* SetSelfReferences(Node* node) {
for (Edge edge : node->input_edges()) {
if (edge.to() == self) node->ReplaceInput(edge.index(), node);
}
return node;
}
const Operator* op(int count, bool effect) {
return effect ? common.EffectPhi(count)
: common.Phi(MachineRepresentation::kTagged, count);
}
Node* Return(Node* val, Node* effect, Node* control) {
Node* zero = graph.NewNode(common.Int32Constant(0));
Node* ret = graph.NewNode(common.Return(), zero, val, effect, control);
end->ReplaceInput(0, ret);
return ret;
}
LoopTree* GetLoopTree() {
if (loop_tree == nullptr) {
if (FLAG_trace_turbo_graph) {
StdoutStream{} << AsRPO(graph);
}
Zone zone(main_isolate()->allocator(), ZONE_NAME);
loop_tree = LoopFinder::BuildLoopTree(&graph, &tick_counter, &zone);
}
return loop_tree;
}
void CheckLoop(Node** header, int header_count, Node** body, int body_count) {
LoopTree* tree = GetLoopTree();
LoopTree::Loop* loop = tree->ContainingLoop(header[0]);
CHECK(loop);
CHECK(header_count == static_cast<int>(loop->HeaderSize()));
for (int i = 0; i < header_count; i++) {
// Each header node should be in the loop.
CHECK_EQ(loop, tree->ContainingLoop(header[i]));
CheckRangeContains(tree->HeaderNodes(loop), header[i]);
}
CHECK_EQ(body_count, static_cast<int>(loop->BodySize()));
// TODO(turbofan): O(n^2) set equivalence in this test.
for (int i = 0; i < body_count; i++) {
// Each body node should be contained in the loop.
CHECK(tree->Contains(loop, body[i]));
CheckRangeContains(tree->BodyNodes(loop), body[i]);
}
}
void CheckRangeContains(NodeRange range, Node* node) {
CHECK_NE(range.end(), std::find(range.begin(), range.end(), node));
}
void CheckNestedLoops(Node** chain, int chain_count) {
LoopTree* tree = GetLoopTree();
for (int i = 0; i < chain_count; i++) {
Node* header = chain[i];
// Each header should be in a loop.
LoopTree::Loop* loop = tree->ContainingLoop(header);
CHECK(loop);
// Check parentage.
LoopTree::Loop* parent =
i == 0 ? nullptr : tree->ContainingLoop(chain[i - 1]);
CHECK_EQ(parent, loop->parent());
for (int j = i - 1; j >= 0; j--) {
// This loop should be nested inside all the outer loops.
Node* outer_header = chain[j];
LoopTree::Loop* outer = tree->ContainingLoop(outer_header);
CHECK(tree->Contains(outer, header));
CHECK(!tree->Contains(loop, outer_header));
}
}
}
Zone* zone() { return main_zone(); }
};
struct While {
LoopFinderTester& t;
Node* branch;
Node* if_true;
Node* exit;
Node* loop;
While(LoopFinderTester& R, Node* cond) : t(R) {
loop = t.graph.NewNode(t.common.Loop(2), t.start, t.start);
branch = t.graph.NewNode(t.common.Branch(), cond, loop);
if_true = t.graph.NewNode(t.common.IfTrue(), branch);
exit = t.graph.NewNode(t.common.IfFalse(), branch);
loop->ReplaceInput(1, if_true);
}
void chain(Node* control) { loop->ReplaceInput(0, control); }
void nest(While* that) {
that->loop->ReplaceInput(1, exit);
this->loop->ReplaceInput(0, that->if_true);
}
};
struct Counter {
Node* base;
Node* inc;
Node* phi;
Node* add;
Counter(While* w, int32_t b, int32_t k)
: base(w->t.jsgraph.Int32Constant(b)),
inc(w->t.jsgraph.Int32Constant(k)) {
Build(w);
}
Counter(While* w, Node* b, Node* k) : base(b), inc(k) { Build(w); }
void Build(While* w) {
phi = w->t.graph.NewNode(w->t.op(2, false), base, base, w->loop);
add = w->t.graph.NewNode(&kIntAdd, phi, inc);
phi->ReplaceInput(1, add);
}
};
struct StoreLoop {
Node* base;
Node* val;
Node* phi;
Node* store;
explicit StoreLoop(While* w)
: base(w->t.graph.start()), val(w->t.jsgraph.Int32Constant(13)) {
Build(w);
}
StoreLoop(While* w, Node* b, Node* v) : base(b), val(v) { Build(w); }
void Build(While* w) {
phi = w->t.graph.NewNode(w->t.op(2, true), base, base, w->loop);
store = w->t.graph.NewNode(&kStore, val, phi, w->loop);
phi->ReplaceInput(1, store);
}
};
TEST(LaLoop1) {
// One loop.
LoopFinderTester t;
While w(t, t.p0);
t.Return(t.p0, t.start, w.exit);
Node* chain[] = {w.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w.loop};
Node* body[] = {w.branch, w.if_true};
t.CheckLoop(header, 1, body, 2);
}
TEST(LaLoop1phi) {
// One loop with a simple phi.
LoopFinderTester t;
While w(t, t.p0);
Node* phi = t.graph.NewNode(t.common.Phi(MachineRepresentation::kTagged, 2),
t.zero, t.one, w.loop);
t.Return(phi, t.start, w.exit);
Node* chain[] = {w.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w.loop, phi};
Node* body[] = {w.branch, w.if_true};
t.CheckLoop(header, 2, body, 2);
}
TEST(LaLoop1c) {
// One loop with a counter.
LoopFinderTester t;
While w(t, t.p0);
Counter c(&w, 0, 1);
t.Return(c.phi, t.start, w.exit);
Node* chain[] = {w.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w.loop, c.phi};
Node* body[] = {w.branch, w.if_true, c.add};
t.CheckLoop(header, 2, body, 3);
}
TEST(LaLoop1e) {
// One loop with an effect phi.
LoopFinderTester t;
While w(t, t.p0);
StoreLoop c(&w);
t.Return(t.p0, c.phi, w.exit);
Node* chain[] = {w.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w.loop, c.phi};
Node* body[] = {w.branch, w.if_true, c.store};
t.CheckLoop(header, 2, body, 3);
}
TEST(LaLoop1d) {
// One loop with two counters.
LoopFinderTester t;
While w(t, t.p0);
Counter c1(&w, 0, 1);
Counter c2(&w, 1, 1);
t.Return(t.graph.NewNode(&kIntAdd, c1.phi, c2.phi), t.start, w.exit);
Node* chain[] = {w.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w.loop, c1.phi, c2.phi};
Node* body[] = {w.branch, w.if_true, c1.add, c2.add};
t.CheckLoop(header, 3, body, 4);
}
TEST(LaLoop2) {
// One loop following another.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
w2.chain(w1.exit);
t.Return(t.p0, t.start, w2.exit);
{
Node* chain[] = {w1.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w1.loop};
Node* body[] = {w1.branch, w1.if_true};
t.CheckLoop(header, 1, body, 2);
}
{
Node* chain[] = {w2.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w2.loop};
Node* body[] = {w2.branch, w2.if_true};
t.CheckLoop(header, 1, body, 2);
}
}
TEST(LaLoop2c) {
// One loop following another, each with counters.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
Counter c1(&w1, 0, 1);
Counter c2(&w2, 0, 1);
w2.chain(w1.exit);
t.Return(t.graph.NewNode(&kIntAdd, c1.phi, c2.phi), t.start, w2.exit);
{
Node* chain[] = {w1.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w1.loop, c1.phi};
Node* body[] = {w1.branch, w1.if_true, c1.add};
t.CheckLoop(header, 2, body, 3);
}
{
Node* chain[] = {w2.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w2.loop, c2.phi};
Node* body[] = {w2.branch, w2.if_true, c2.add};
t.CheckLoop(header, 2, body, 3);
}
}
TEST(LaLoop2cc) {
// One loop following another; second loop uses phi from first.
for (int i = 0; i < 8; i++) {
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
Counter c1(&w1, 0, 1);
// various usage scenarios for the second loop.
Counter c2(&w2, i & 1 ? t.p0 : c1.phi, i & 2 ? t.p0 : c1.phi);
if (i & 3) w2.branch->ReplaceInput(0, c1.phi);
w2.chain(w1.exit);
t.Return(t.graph.NewNode(&kIntAdd, c1.phi, c2.phi), t.start, w2.exit);
{
Node* chain[] = {w1.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w1.loop, c1.phi};
Node* body[] = {w1.branch, w1.if_true, c1.add};
t.CheckLoop(header, 2, body, 3);
}
{
Node* chain[] = {w2.loop};
t.CheckNestedLoops(chain, 1);
Node* header[] = {w2.loop, c2.phi};
Node* body[] = {w2.branch, w2.if_true, c2.add};
t.CheckLoop(header, 2, body, 3);
}
}
}
TEST(LaNestedLoop1) {
// One loop nested in another.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
w2.nest(&w1);
t.Return(t.p0, t.start, w1.exit);
Node* chain[] = {w1.loop, w2.loop};
t.CheckNestedLoops(chain, 2);
Node* h1[] = {w1.loop};
Node* b1[] = {w1.branch, w1.if_true, w2.loop, w2.branch, w2.if_true, w2.exit};
t.CheckLoop(h1, 1, b1, 6);
Node* h2[] = {w2.loop};
Node* b2[] = {w2.branch, w2.if_true};
t.CheckLoop(h2, 1, b2, 2);
}
TEST(LaNestedLoop1c) {
// One loop nested in another, each with a counter.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
Counter c1(&w1, 0, 1);
Counter c2(&w2, 0, 1);
w2.branch->ReplaceInput(0, c2.phi);
w2.nest(&w1);
t.Return(c1.phi, t.start, w1.exit);
Node* chain[] = {w1.loop, w2.loop};
t.CheckNestedLoops(chain, 2);
Node* h1[] = {w1.loop, c1.phi};
Node* b1[] = {w1.branch, w1.if_true, w2.loop, w2.branch, w2.if_true,
w2.exit, c2.phi, c1.add, c2.add};
t.CheckLoop(h1, 2, b1, 9);
Node* h2[] = {w2.loop, c2.phi};
Node* b2[] = {w2.branch, w2.if_true, c2.add};
t.CheckLoop(h2, 2, b2, 3);
}
TEST(LaNestedLoop1x) {
// One loop nested in another.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
w2.nest(&w1);
const Operator* op = t.common.Phi(MachineRepresentation::kWord32, 2);
Node* p1a = t.graph.NewNode(op, t.p0, t.p0, w1.loop);
Node* p1b = t.graph.NewNode(op, t.p0, t.p0, w1.loop);
Node* p2a = t.graph.NewNode(op, p1a, t.p0, w2.loop);
Node* p2b = t.graph.NewNode(op, p1b, t.p0, w2.loop);
p1a->ReplaceInput(1, p2b);
p1b->ReplaceInput(1, p2a);
p2a->ReplaceInput(1, p2b);
p2b->ReplaceInput(1, p2a);
t.Return(t.p0, t.start, w1.exit);
Node* chain[] = {w1.loop, w2.loop};
t.CheckNestedLoops(chain, 2);
Node* h1[] = {w1.loop, p1a, p1b};
Node* b1[] = {w1.branch, w1.if_true, w2.loop, p2a,
p2b, w2.branch, w2.if_true, w2.exit};
t.CheckLoop(h1, 3, b1, 8);
Node* h2[] = {w2.loop, p2a, p2b};
Node* b2[] = {w2.branch, w2.if_true};
t.CheckLoop(h2, 3, b2, 2);
}
TEST(LaNestedLoop2) {
// Two loops nested in an outer loop.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
While w3(t, t.p0);
w2.nest(&w1);
w3.nest(&w1);
w3.chain(w2.exit);
t.Return(t.p0, t.start, w1.exit);
Node* chain1[] = {w1.loop, w2.loop};
t.CheckNestedLoops(chain1, 2);
Node* chain2[] = {w1.loop, w3.loop};
t.CheckNestedLoops(chain2, 2);
Node* h1[] = {w1.loop};
Node* b1[] = {w1.branch, w1.if_true, w2.loop, w2.branch, w2.if_true,
w2.exit, w3.loop, w3.branch, w3.if_true, w3.exit};
t.CheckLoop(h1, 1, b1, 10);
Node* h2[] = {w2.loop};
Node* b2[] = {w2.branch, w2.if_true};
t.CheckLoop(h2, 1, b2, 2);
Node* h3[] = {w3.loop};
Node* b3[] = {w3.branch, w3.if_true};
t.CheckLoop(h3, 1, b3, 2);
}
TEST(LaNestedLoop3) {
// Three nested loops.
LoopFinderTester t;
While w1(t, t.p0);
While w2(t, t.p0);
While w3(t, t.p0);
w2.loop->ReplaceInput(0, w1.if_true);
w3.loop->ReplaceInput(0, w2.if_true);
w2.loop->ReplaceInput(1, w3.exit);
w1.loop->ReplaceInput(1, w2.exit);
t.Return(t.p0, t.start, w1.exit);
Node* chain[] = {w1.loop, w2.loop, w3.loop};
t.CheckNestedLoops(chain, 3);
Node* h1[] = {w1.loop};
Node* b1[] = {w1.branch, w1.if_true, w2.loop, w2.branch, w2.if_true,
w2.exit, w3.loop, w3.branch, w3.if_true, w3.exit};
t.CheckLoop(h1, 1, b1, 10);
Node* h2[] = {w2.loop};
Node* b2[] = {w2.branch, w2.if_true, w3.loop, w3.branch, w3.if_true, w3.exit};
t.CheckLoop(h2, 1, b2, 6);
Node* h3[] = {w3.loop};
Node* b3[] = {w3.branch, w3.if_true};
t.CheckLoop(h3, 1, b3, 2);
}
TEST(LaNestedLoop3c) {
// Three nested loops with counters.
LoopFinderTester t;
While w1(t, t.p0);
Counter c1(&w1, 0, 1);
While w2(t, t.p0);
Counter c2(&w2, 0, 1);
While w3(t, t.p0);
Counter c3(&w3, 0, 1);
w2.loop->ReplaceInput(0, w1.if_true);
w3.loop->ReplaceInput(0, w2.if_true);
w2.loop->ReplaceInput(1, w3.exit);
w1.loop->ReplaceInput(1, w2.exit);
w1.branch->ReplaceInput(0, c1.phi);
w2.branch->ReplaceInput(0, c2.phi);
w3.branch->ReplaceInput(0, c3.phi);
t.Return(c1.phi, t.start, w1.exit);
Node* chain[] = {w1.loop, w2.loop, w3.loop};
t.CheckNestedLoops(chain, 3);
Node* h1[] = {w1.loop, c1.phi};
Node* b1[] = {w1.branch, w1.if_true, c1.add, c2.add, c2.add,
c2.phi, c3.phi, w2.loop, w2.branch, w2.if_true,
w2.exit, w3.loop, w3.branch, w3.if_true, w3.exit};
t.CheckLoop(h1, 2, b1, 15);
Node* h2[] = {w2.loop, c2.phi};
Node* b2[] = {w2.branch, w2.if_true, c2.add, c3.add, c3.phi,
w3.loop, w3.branch, w3.if_true, w3.exit};
t.CheckLoop(h2, 2, b2, 9);
Node* h3[] = {w3.loop, c3.phi};
Node* b3[] = {w3.branch, w3.if_true, c3.add};
t.CheckLoop(h3, 2, b3, 3);
}
TEST(LaMultipleExit1) {
const int kMaxExits = 10;
Node* merge[1 + kMaxExits];
Node* body[2 * kMaxExits];
// A single loop with {i} exits.
for (int i = 1; i < kMaxExits; i++) {
LoopFinderTester t;
Node* cond = t.p0;
int merge_count = 0;
int body_count = 0;
Node* loop = t.graph.NewNode(t.common.Loop(2), t.start, t.start);
Node* last = loop;
for (int e = 0; e < i; e++) {
Node* branch = t.graph.NewNode(t.common.Branch(), cond, last);
Node* if_true = t.graph.NewNode(t.common.IfTrue(), branch);
Node* exit = t.graph.NewNode(t.common.IfFalse(), branch);
last = if_true;
body[body_count++] = branch;
body[body_count++] = if_true;
merge[merge_count++] = exit;
}
loop->ReplaceInput(1, last); // form loop backedge.
Node* end = t.graph.NewNode(t.common.Merge(i), i, merge); // form exit.
t.graph.SetEnd(end);
Node* h[] = {loop};
t.CheckLoop(h, 1, body, body_count);
}
}
TEST(LaMultipleBackedge1) {
const int kMaxBackedges = 10;
Node* loop_inputs[1 + kMaxBackedges];
Node* body[3 * kMaxBackedges];
// A single loop with {i} backedges.
for (int i = 1; i < kMaxBackedges; i++) {
LoopFinderTester t;
for (int j = 0; j <= i; j++) loop_inputs[j] = t.start;
Node* loop = t.graph.NewNode(t.common.Loop(1 + i), 1 + i, loop_inputs);
Node* cond = t.p0;
int body_count = 0;
Node* exit = loop;
for (int b = 0; b < i; b++) {
Node* branch = t.graph.NewNode(t.common.Branch(), cond, exit);
Node* if_true = t.graph.NewNode(t.common.IfTrue(), branch);
Node* if_false = t.graph.NewNode(t.common.IfFalse(), branch);
exit = if_false;
body[body_count++] = branch;
body[body_count++] = if_true;
if (b != (i - 1)) body[body_count++] = if_false;
loop->ReplaceInput(1 + b, if_true);
}
t.graph.SetEnd(exit);
Node* h[] = {loop};
t.CheckLoop(h, 1, body, body_count);
}
}
TEST(LaEdgeMatrix1) {
// Test various kinds of extra edges added to a simple loop.
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
for (int k = 0; k < 3; k++) {
LoopFinderTester t;
Node* p1 = t.jsgraph.Int32Constant(11);
Node* p2 = t.jsgraph.Int32Constant(22);
Node* p3 = t.jsgraph.Int32Constant(33);
Node* loop = t.graph.NewNode(t.common.Loop(2), t.start, t.start);
Node* phi = t.graph.NewNode(
t.common.Phi(MachineRepresentation::kWord32, 2), t.one, p1, loop);
Node* cond = t.graph.NewNode(&kIntAdd, phi, p2);
Node* branch = t.graph.NewNode(t.common.Branch(), cond, loop);
Node* if_true = t.graph.NewNode(t.common.IfTrue(), branch);
Node* exit = t.graph.NewNode(t.common.IfFalse(), branch);
loop->ReplaceInput(1, if_true);
Node* zero = t.graph.NewNode(t.common.Int32Constant(0));
Node* ret = t.graph.NewNode(t.common.Return(), zero, p3, t.start, exit);
t.graph.SetEnd(ret);
Node* choices[] = {p1, phi, cond};
p1->ReplaceUses(choices[i]);
p2->ReplaceUses(choices[j]);
p3->ReplaceUses(choices[k]);
Node* header[] = {loop, phi};
Node* body[] = {cond, branch, if_true};
t.CheckLoop(header, 2, body, 3);
}
}
}
}
void RunEdgeMatrix2(int i) {
CHECK(i >= 0 && i < 5);
for (int j = 0; j < 5; j++) {
for (int k = 0; k < 5; k++) {
LoopFinderTester t;
Node* p1 = t.jsgraph.Int32Constant(11);
Node* p2 = t.jsgraph.Int32Constant(22);
Node* p3 = t.jsgraph.Int32Constant(33);
// outer loop.
Node* loop1 = t.graph.NewNode(t.common.Loop(2), t.start, t.start);
Node* phi1 = t.graph.NewNode(
t.common.Phi(MachineRepresentation::kWord32, 2), t.one, p1, loop1);
Node* cond1 = t.graph.NewNode(&kIntAdd, phi1, t.one);
Node* branch1 = t.graph.NewNode(t.common.Branch(), cond1, loop1);
Node* if_true1 = t.graph.NewNode(t.common.IfTrue(), branch1);
Node* exit1 = t.graph.NewNode(t.common.IfFalse(), branch1);
// inner loop.
Node* loop2 = t.graph.NewNode(t.common.Loop(2), if_true1, t.start);
Node* phi2 = t.graph.NewNode(
t.common.Phi(MachineRepresentation::kWord32, 2), t.one, p2, loop2);
Node* cond2 = t.graph.NewNode(&kIntAdd, phi2, p3);
Node* branch2 = t.graph.NewNode(t.common.Branch(), cond2, loop2);
Node* if_true2 = t.graph.NewNode(t.common.IfTrue(), branch2);
Node* exit2 = t.graph.NewNode(t.common.IfFalse(), branch2);
loop2->ReplaceInput(1, if_true2);
loop1->ReplaceInput(1, exit2);
Node* zero = t.graph.NewNode(t.common.Int32Constant(0));
Node* ret =
t.graph.NewNode(t.common.Return(), zero, phi1, t.start, exit1);
t.graph.SetEnd(ret);
Node* choices[] = {p1, phi1, cond1, phi2, cond2};
p1->ReplaceUses(choices[i]);
p2->ReplaceUses(choices[j]);
p3->ReplaceUses(choices[k]);
Node* header1[] = {loop1, phi1};
Node* body1[] = {cond1, branch1, if_true1, exit2, loop2,
phi2, cond2, branch2, if_true2};
t.CheckLoop(header1, 2, body1, 9);
Node* header2[] = {loop2, phi2};
Node* body2[] = {cond2, branch2, if_true2};
t.CheckLoop(header2, 2, body2, 3);
Node* chain[] = {loop1, loop2};
t.CheckNestedLoops(chain, 2);
}
}
}
TEST(LaEdgeMatrix2_0) { RunEdgeMatrix2(0); }
TEST(LaEdgeMatrix2_1) { RunEdgeMatrix2(1); }
TEST(LaEdgeMatrix2_2) { RunEdgeMatrix2(2); }
TEST(LaEdgeMatrix2_3) { RunEdgeMatrix2(3); }
TEST(LaEdgeMatrix2_4) { RunEdgeMatrix2(4); }
// Generates a triply-nested loop with extra edges between the phis and
// conditions according to the edge choice parameters.
void RunEdgeMatrix3(int c1a, int c1b, int c1c, // line break
int c2a, int c2b, int c2c, // line break
int c3a, int c3b, int c3c) { // line break
LoopFinderTester t;
Node* p1a = t.jsgraph.Int32Constant(11);
Node* p1b = t.jsgraph.Int32Constant(22);
Node* p1c = t.jsgraph.Int32Constant(33);
Node* p2a = t.jsgraph.Int32Constant(44);
Node* p2b = t.jsgraph.Int32Constant(55);
Node* p2c = t.jsgraph.Int32Constant(66);
Node* p3a = t.jsgraph.Int32Constant(77);
Node* p3b = t.jsgraph.Int32Constant(88);
Node* p3c = t.jsgraph.Int32Constant(99);
// L1 depth = 0
Node* loop1 = t.graph.NewNode(t.common.Loop(2), t.start, t.start);
Node* phi1 = t.graph.NewNode(t.common.Phi(MachineRepresentation::kWord32, 2),
p1a, p1c, loop1);
Node* cond1 = t.graph.NewNode(&kIntAdd, phi1, p1b);
Node* branch1 = t.graph.NewNode(t.common.Branch(), cond1, loop1);
Node* if_true1 = t.graph.NewNode(t.common.IfTrue(), branch1);
Node* exit1 = t.graph.NewNode(t.common.IfFalse(), branch1);
// L2 depth = 1
Node* loop2 = t.graph.NewNode(t.common.Loop(2), if_true1, t.start);
Node* phi2 = t.graph.NewNode(t.common.Phi(MachineRepresentation::kWord32, 2),
p2a, p2c, loop2);
Node* cond2 = t.graph.NewNode(&kIntAdd, phi2, p2b);
Node* branch2 = t.graph.NewNode(t.common.Branch(), cond2, loop2);
Node* if_true2 = t.graph.NewNode(t.common.IfTrue(), branch2);
Node* exit2 = t.graph.NewNode(t.common.IfFalse(), branch2);
// L3 depth = 2
Node* loop3 = t.graph.NewNode(t.common.Loop(2), if_true2, t.start);
Node* phi3 = t.graph.NewNode(t.common.Phi(MachineRepresentation::kWord32, 2),
p3a, p3c, loop3);
Node* cond3 = t.graph.NewNode(&kIntAdd, phi3, p3b);
Node* branch3 = t.graph.NewNode(t.common.Branch(), cond3, loop3);
Node* if_true3 = t.graph.NewNode(t.common.IfTrue(), branch3);
Node* exit3 = t.graph.NewNode(t.common.IfFalse(), branch3);
loop3->ReplaceInput(1, if_true3);
loop2->ReplaceInput(1, exit3);
loop1->ReplaceInput(1, exit2);
Node* zero = t.graph.NewNode(t.common.Int32Constant(0));
Node* ret = t.graph.NewNode(t.common.Return(), zero, phi1, t.start, exit1);
t.graph.SetEnd(ret);
// Mutate the graph according to the edge choices.
Node* o1[] = {t.one};
Node* o2[] = {t.one, phi1, cond1};
Node* o3[] = {t.one, phi1, cond1, phi2, cond2};
p1a->ReplaceUses(o1[c1a]);
p1b->ReplaceUses(o1[c1b]);
p2a->ReplaceUses(o2[c2a]);
p2b->ReplaceUses(o2[c2b]);
p3a->ReplaceUses(o3[c3a]);
p3b->ReplaceUses(o3[c3b]);
Node* l2[] = {phi1, cond1, phi2, cond2};
Node* l3[] = {phi1, cond1, phi2, cond2, phi3, cond3};
p1c->ReplaceUses(l2[c1c]);
p2c->ReplaceUses(l3[c2c]);
p3c->ReplaceUses(l3[c3c]);
// Run the tests and verify loop structure.
Node* chain[] = {loop1, loop2, loop3};
t.CheckNestedLoops(chain, 3);
Node* header1[] = {loop1, phi1};
Node* body1[] = {cond1, branch1, if_true1, exit2, loop2,
phi2, cond2, branch2, if_true2, exit3,
loop3, phi3, cond3, branch3, if_true3};
t.CheckLoop(header1, 2, body1, 15);
Node* header2[] = {loop2, phi2};
Node* body2[] = {cond2, branch2, if_true2, exit3, loop3,
phi3, cond3, branch3, if_true3};
t.CheckLoop(header2, 2, body2, 9);
Node* header3[] = {loop3, phi3};
Node* body3[] = {cond3, branch3, if_true3};
t.CheckLoop(header3, 2, body3, 3);
}
// Runs all combinations with a fixed {i}.
static void RunEdgeMatrix3_i(int i) {
for (int a = 0; a < 1; a++) {
for (int b = 0; b < 1; b++) {
for (int c = 0; c < 4; c++) {
for (int d = 0; d < 3; d++) {
for (int e = 0; e < 3; e++) {
for (int f = 0; f < 6; f++) {
for (int g = 0; g < 5; g++) {
for (int h = 0; h < 5; h++) {
RunEdgeMatrix3(a, b, c, d, e, f, g, h, i);
}
}
}
}
}
}
}
}
}
// Test all possible legal triply-nested loops with conditions and phis.
TEST(LaEdgeMatrix3_0) { RunEdgeMatrix3_i(0); }
TEST(LaEdgeMatrix3_1) { RunEdgeMatrix3_i(1); }
TEST(LaEdgeMatrix3_2) { RunEdgeMatrix3_i(2); }
TEST(LaEdgeMatrix3_3) { RunEdgeMatrix3_i(3); }
TEST(LaEdgeMatrix3_4) { RunEdgeMatrix3_i(4); }
TEST(LaEdgeMatrix3_5) { RunEdgeMatrix3_i(5); }
static void RunManyChainedLoops_i(int count) {
LoopFinderTester t;
Node** nodes = t.zone()->NewArray<Node*>(count * 4);
Node* k11 = t.jsgraph.Int32Constant(11);
Node* k12 = t.jsgraph.Int32Constant(12);
Node* last = t.start;
// Build loops.
for (int i = 0; i < count; i++) {
Node* loop = t.graph.NewNode(t.common.Loop(2), last, t.start);
Node* phi = t.graph.NewNode(t.common.Phi(MachineRepresentation::kWord32, 2),
k11, k12, loop);
Node* branch = t.graph.NewNode(t.common.Branch(), phi, loop);
Node* if_true = t.graph.NewNode(t.common.IfTrue(), branch);
Node* exit = t.graph.NewNode(t.common.IfFalse(), branch);
loop->ReplaceInput(1, if_true);
nodes[i * 4 + 0] = loop;
nodes[i * 4 + 1] = phi;
nodes[i * 4 + 2] = branch;
nodes[i * 4 + 3] = if_true;
last = exit;
}
Node* zero = t.graph.NewNode(t.common.Int32Constant(0));
Node* ret = t.graph.NewNode(t.common.Return(), zero, t.p0, t.start, last);
t.graph.SetEnd(ret);
// Verify loops.
for (int i = 0; i < count; i++) {
t.CheckLoop(nodes + i * 4, 2, nodes + i * 4 + 2, 2);
}
}
static void RunManyNestedLoops_i(int count) {
LoopFinderTester t;
Node** nodes = t.zone()->NewArray<Node*>(count * 5);
Node* k11 = t.jsgraph.Int32Constant(11);
Node* k12 = t.jsgraph.Int32Constant(12);
Node* outer = nullptr;
Node* entry = t.start;
// Build loops.
Node* zero = t.graph.NewNode(t.common.Int32Constant(0));
for (int i = 0; i < count; i++) {
Node* loop = t.graph.NewNode(t.common.Loop(2), entry, t.start);
Node* phi = t.graph.NewNode(t.common.Phi(MachineRepresentation::kWord32, 2),
k11, k12, loop);
Node* branch = t.graph.NewNode(t.common.Branch(), phi, loop);
Node* if_true = t.graph.NewNode(t.common.IfTrue(), branch);
Node* exit = t.graph.NewNode(t.common.IfFalse(), branch);
nodes[i * 5 + 0] = exit; // outside
nodes[i * 5 + 1] = loop; // header
nodes[i * 5 + 2] = phi; // header
nodes[i * 5 + 3] = branch; // body
nodes[i * 5 + 4] = if_true; // body
if (outer != nullptr) {
// inner loop.
outer->ReplaceInput(1, exit);
} else {
// outer loop.
Node* ret = t.graph.NewNode(t.common.Return(), zero, t.p0, t.start, exit);
t.graph.SetEnd(ret);
}
outer = loop;
entry = if_true;
}
outer->ReplaceInput(1, entry); // innermost loop.
// Verify loops.
for (int i = 0; i < count; i++) {
int k = i * 5;
t.CheckLoop(nodes + k + 1, 2, nodes + k + 3, count * 5 - k - 3);
}
}
TEST(LaManyChained_30) { RunManyChainedLoops_i(30); }
TEST(LaManyChained_31) { RunManyChainedLoops_i(31); }
TEST(LaManyChained_32) { RunManyChainedLoops_i(32); }
TEST(LaManyChained_33) { RunManyChainedLoops_i(33); }
TEST(LaManyChained_34) { RunManyChainedLoops_i(34); }
TEST(LaManyChained_62) { RunManyChainedLoops_i(62); }
TEST(LaManyChained_63) { RunManyChainedLoops_i(63); }
TEST(LaManyChained_64) { RunManyChainedLoops_i(64); }
TEST(LaManyNested_30) { RunManyNestedLoops_i(30); }
TEST(LaManyNested_31) { RunManyNestedLoops_i(31); }
TEST(LaManyNested_32) { RunManyNestedLoops_i(32); }
TEST(LaManyNested_33) { RunManyNestedLoops_i(33); }
TEST(LaManyNested_34) { RunManyNestedLoops_i(34); }
TEST(LaManyNested_62) { RunManyNestedLoops_i(62); }
TEST(LaManyNested_63) { RunManyNestedLoops_i(63); }
TEST(LaManyNested_64) { RunManyNestedLoops_i(64); }
TEST(LaPhiTangle) { LoopFinderTester t; }
} // namespace compiler
} // namespace internal
} // namespace v8