31637fb396
BUG= Review URL: https://codereview.chromium.org/898353002 Cr-Commit-Position: refs/heads/master@{#26576}
458 lines
15 KiB
C++
458 lines
15 KiB
C++
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/codegen.h"
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#include "src/compiler/common-operator.h"
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#include "src/compiler/diamond.h"
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#include "src/compiler/graph.h"
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#include "src/compiler/js-graph.h"
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#include "src/compiler/js-operator.h"
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#include "src/compiler/operator.h"
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#include "src/compiler/osr.h"
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#include "test/cctest/cctest.h"
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using namespace v8::internal;
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using namespace v8::internal::compiler;
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// TODO(titzer): move this method to a common testing place.
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static int CheckInputs(Node* node, Node* i0 = NULL, Node* i1 = NULL,
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Node* i2 = NULL, Node* i3 = NULL) {
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int count = 4;
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if (i3 == NULL) count = 3;
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if (i2 == NULL) count = 2;
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if (i1 == NULL) count = 1;
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if (i0 == NULL) count = 0;
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CHECK_EQ(count, node->InputCount());
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if (i0 != NULL) CHECK_EQ(i0, node->InputAt(0));
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if (i1 != NULL) CHECK_EQ(i1, node->InputAt(1));
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if (i2 != NULL) CHECK_EQ(i2, node->InputAt(2));
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if (i3 != NULL) CHECK_EQ(i3, node->InputAt(3));
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return count;
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}
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static Operator kIntLt(IrOpcode::kInt32LessThan, Operator::kPure,
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"Int32LessThan", 2, 0, 0, 1, 0, 0);
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static const int kMaxOsrValues = 10;
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class OsrDeconstructorTester : public HandleAndZoneScope {
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public:
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explicit OsrDeconstructorTester(int num_values)
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: isolate(main_isolate()),
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common(main_zone()),
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graph(main_zone()),
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jsgraph(main_isolate(), &graph, &common, NULL, NULL),
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start(graph.NewNode(common.Start(1))),
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p0(graph.NewNode(common.Parameter(0), start)),
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end(graph.NewNode(common.End(), start)),
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osr_normal_entry(graph.NewNode(common.OsrNormalEntry(), start, start)),
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osr_loop_entry(graph.NewNode(common.OsrLoopEntry(), start, start)),
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self(graph.NewNode(common.Int32Constant(0xaabbccdd))) {
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CHECK(num_values <= kMaxOsrValues);
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graph.SetStart(start);
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for (int i = 0; i < num_values; i++) {
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osr_values[i] = graph.NewNode(common.OsrValue(i), osr_loop_entry);
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}
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}
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Isolate* isolate;
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CommonOperatorBuilder common;
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Graph graph;
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JSGraph jsgraph;
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Node* start;
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Node* p0;
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Node* end;
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Node* osr_normal_entry;
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Node* osr_loop_entry;
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Node* self;
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Node* osr_values[kMaxOsrValues];
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Node* NewOsrPhi(Node* loop, Node* incoming, int osr_value, Node* back1 = NULL,
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Node* back2 = NULL, Node* back3 = NULL) {
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int count = 5;
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if (back3 == NULL) count = 4;
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if (back2 == NULL) count = 3;
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if (back1 == NULL) count = 2;
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CHECK_EQ(loop->InputCount(), count);
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CHECK_EQ(osr_loop_entry, loop->InputAt(1));
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Node* inputs[6];
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inputs[0] = incoming;
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inputs[1] = osr_values[osr_value];
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if (count > 2) inputs[2] = back1;
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if (count > 3) inputs[3] = back2;
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if (count > 4) inputs[4] = back3;
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inputs[count] = loop;
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return graph.NewNode(common.Phi(kMachAnyTagged, count), count + 1, inputs);
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}
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Node* NewLoop(bool is_osr, int num_backedges, Node* entry = NULL) {
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CHECK_LT(num_backedges, 4);
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CHECK_GE(num_backedges, 0);
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int count = 1 + num_backedges;
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if (entry == NULL) entry = osr_normal_entry;
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Node* inputs[5] = {entry, self, self, self, self};
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if (is_osr) {
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count = 2 + num_backedges;
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inputs[1] = osr_loop_entry;
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}
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Node* loop = graph.NewNode(common.Loop(count), count, inputs);
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for (int i = 0; i < loop->InputCount(); i++) {
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if (loop->InputAt(i) == self) loop->ReplaceInput(i, loop);
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}
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return loop;
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}
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Node* NewOsrLoop(int num_backedges, Node* entry = NULL) {
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return NewLoop(true, num_backedges, entry);
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}
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};
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TEST(Deconstruct_osr0) {
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OsrDeconstructorTester T(0);
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Node* loop = T.NewOsrLoop(1);
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T.graph.SetEnd(loop);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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CheckInputs(loop, T.start, loop);
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}
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TEST(Deconstruct_osr1) {
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OsrDeconstructorTester T(1);
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Node* loop = T.NewOsrLoop(1);
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Node* osr_phi =
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T.NewOsrPhi(loop, T.jsgraph.OneConstant(), 0, T.jsgraph.ZeroConstant());
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Node* ret = T.graph.NewNode(T.common.Return(), osr_phi, T.start, loop);
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T.graph.SetEnd(ret);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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CheckInputs(loop, T.start, loop);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(), loop);
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CheckInputs(ret, osr_phi, T.start, loop);
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}
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TEST(Deconstruct_osr_remove_prologue) {
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OsrDeconstructorTester T(1);
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Diamond d(&T.graph, &T.common, T.p0);
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d.Chain(T.osr_normal_entry);
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Node* loop = T.NewOsrLoop(1, d.merge);
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Node* osr_phi =
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T.NewOsrPhi(loop, T.jsgraph.OneConstant(), 0, T.jsgraph.ZeroConstant());
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Node* ret = T.graph.NewNode(T.common.Return(), osr_phi, T.start, loop);
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T.graph.SetEnd(ret);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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CheckInputs(loop, T.start, loop);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(), loop);
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CheckInputs(ret, osr_phi, T.start, loop);
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// The control before the loop should have been removed.
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CHECK(d.branch->IsDead());
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CHECK(d.if_true->IsDead());
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CHECK(d.if_false->IsDead());
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CHECK(d.merge->IsDead());
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}
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TEST(Deconstruct_osr_with_body1) {
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OsrDeconstructorTester T(1);
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Node* loop = T.NewOsrLoop(1);
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Node* branch = T.graph.NewNode(T.common.Branch(), T.p0, loop);
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Node* if_true = T.graph.NewNode(T.common.IfTrue(), branch);
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Node* if_false = T.graph.NewNode(T.common.IfFalse(), branch);
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loop->ReplaceInput(2, if_true);
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Node* osr_phi =
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T.NewOsrPhi(loop, T.jsgraph.OneConstant(), 0, T.jsgraph.ZeroConstant());
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Node* ret = T.graph.NewNode(T.common.Return(), osr_phi, T.start, if_false);
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T.graph.SetEnd(ret);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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CheckInputs(loop, T.start, if_true);
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CheckInputs(branch, T.p0, loop);
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CheckInputs(if_true, branch);
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CheckInputs(if_false, branch);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(), loop);
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CheckInputs(ret, osr_phi, T.start, if_false);
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}
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TEST(Deconstruct_osr_with_body2) {
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OsrDeconstructorTester T(1);
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Node* loop = T.NewOsrLoop(1);
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// Two chained branches in the the body of the loop.
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Node* branch1 = T.graph.NewNode(T.common.Branch(), T.p0, loop);
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Node* if_true1 = T.graph.NewNode(T.common.IfTrue(), branch1);
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Node* if_false1 = T.graph.NewNode(T.common.IfFalse(), branch1);
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Node* branch2 = T.graph.NewNode(T.common.Branch(), T.p0, if_true1);
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Node* if_true2 = T.graph.NewNode(T.common.IfTrue(), branch2);
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Node* if_false2 = T.graph.NewNode(T.common.IfFalse(), branch2);
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loop->ReplaceInput(2, if_true2);
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Node* osr_phi =
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T.NewOsrPhi(loop, T.jsgraph.OneConstant(), 0, T.jsgraph.ZeroConstant());
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Node* merge = T.graph.NewNode(T.common.Merge(2), if_false1, if_false2);
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Node* ret = T.graph.NewNode(T.common.Return(), osr_phi, T.start, merge);
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T.graph.SetEnd(ret);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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CheckInputs(loop, T.start, if_true2);
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CheckInputs(branch1, T.p0, loop);
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CheckInputs(branch2, T.p0, if_true1);
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CheckInputs(if_true1, branch1);
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CheckInputs(if_false1, branch1);
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CheckInputs(if_true2, branch2);
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CheckInputs(if_false2, branch2);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(), loop);
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CheckInputs(ret, osr_phi, T.start, merge);
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CheckInputs(merge, if_false1, if_false2);
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}
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TEST(Deconstruct_osr_with_body3) {
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OsrDeconstructorTester T(1);
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Node* loop = T.NewOsrLoop(2);
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// Two branches that create two different backedges.
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Node* branch1 = T.graph.NewNode(T.common.Branch(), T.p0, loop);
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Node* if_true1 = T.graph.NewNode(T.common.IfTrue(), branch1);
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Node* if_false1 = T.graph.NewNode(T.common.IfFalse(), branch1);
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Node* branch2 = T.graph.NewNode(T.common.Branch(), T.p0, if_true1);
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Node* if_true2 = T.graph.NewNode(T.common.IfTrue(), branch2);
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Node* if_false2 = T.graph.NewNode(T.common.IfFalse(), branch2);
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loop->ReplaceInput(2, if_false1);
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loop->ReplaceInput(3, if_true2);
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Node* osr_phi =
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T.NewOsrPhi(loop, T.jsgraph.OneConstant(), 0, T.jsgraph.ZeroConstant(),
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T.jsgraph.ZeroConstant());
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Node* ret = T.graph.NewNode(T.common.Return(), osr_phi, T.start, if_false2);
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T.graph.SetEnd(ret);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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CheckInputs(loop, T.start, if_false1, if_true2);
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CheckInputs(branch1, T.p0, loop);
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CheckInputs(branch2, T.p0, if_true1);
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CheckInputs(if_true1, branch1);
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CheckInputs(if_false1, branch1);
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CheckInputs(if_true2, branch2);
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CheckInputs(if_false2, branch2);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(),
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T.jsgraph.ZeroConstant(), loop);
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CheckInputs(ret, osr_phi, T.start, if_false2);
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}
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struct While {
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OsrDeconstructorTester& t;
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Node* branch;
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Node* if_true;
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Node* exit;
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Node* loop;
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While(OsrDeconstructorTester& R, Node* cond, bool is_osr, int backedges = 1)
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: t(R) {
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loop = t.NewLoop(is_osr, backedges);
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branch = t.graph.NewNode(t.common.Branch(), cond, loop);
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if_true = t.graph.NewNode(t.common.IfTrue(), branch);
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exit = t.graph.NewNode(t.common.IfFalse(), branch);
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loop->ReplaceInput(loop->InputCount() - 1, if_true);
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}
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void Nest(While& that) {
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that.loop->ReplaceInput(that.loop->InputCount() - 1, exit);
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this->loop->ReplaceInput(0, that.if_true);
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}
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Node* Phi(Node* i1, Node* i2, Node* i3) {
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if (loop->InputCount() == 2) {
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return t.graph.NewNode(t.common.Phi(kMachAnyTagged, 2), i1, i2, loop);
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} else {
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return t.graph.NewNode(t.common.Phi(kMachAnyTagged, 3), i1, i2, i3, loop);
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}
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}
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};
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static Node* FindSuccessor(Node* node, IrOpcode::Value opcode) {
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for (Node* use : node->uses()) {
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if (use->opcode() == opcode) return use;
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}
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UNREACHABLE(); // should have been found.
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return nullptr;
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}
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TEST(Deconstruct_osr_nested1) {
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OsrDeconstructorTester T(1);
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While outer(T, T.p0, false);
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While inner(T, T.p0, true);
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inner.Nest(outer);
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Node* outer_phi = outer.Phi(T.p0, T.p0, nullptr);
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outer.branch->ReplaceInput(0, outer_phi);
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Node* osr_phi = inner.Phi(T.jsgraph.OneConstant(), T.osr_values[0],
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T.jsgraph.ZeroConstant());
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inner.branch->ReplaceInput(0, osr_phi);
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outer_phi->ReplaceInput(1, osr_phi);
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Node* ret =
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T.graph.NewNode(T.common.Return(), outer_phi, T.start, outer.exit);
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Node* end = T.graph.NewNode(T.common.End(), ret);
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T.graph.SetEnd(end);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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// Check structure of deconstructed graph.
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// Check inner OSR loop is directly connected to start.
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CheckInputs(inner.loop, T.start, inner.if_true);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(), inner.loop);
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// Check control transfer to copy of outer loop.
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Node* new_outer_loop = FindSuccessor(inner.exit, IrOpcode::kLoop);
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Node* new_outer_phi = FindSuccessor(new_outer_loop, IrOpcode::kPhi);
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CHECK_NE(new_outer_loop, outer.loop);
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CHECK_NE(new_outer_phi, outer_phi);
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CheckInputs(new_outer_loop, inner.exit, new_outer_loop->InputAt(1));
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// Check structure of outer loop.
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Node* new_outer_branch = FindSuccessor(new_outer_loop, IrOpcode::kBranch);
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CHECK_NE(new_outer_branch, outer.branch);
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CheckInputs(new_outer_branch, new_outer_phi, new_outer_loop);
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Node* new_outer_exit = FindSuccessor(new_outer_branch, IrOpcode::kIfFalse);
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Node* new_outer_if_true = FindSuccessor(new_outer_branch, IrOpcode::kIfTrue);
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// Check structure of return.
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end = T.graph.end();
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Node* new_ret = end->InputAt(0);
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CHECK_EQ(IrOpcode::kReturn, new_ret->opcode());
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CheckInputs(new_ret, new_outer_phi, T.start, new_outer_exit);
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// Check structure of inner loop.
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Node* new_inner_loop = FindSuccessor(new_outer_if_true, IrOpcode::kLoop);
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Node* new_inner_phi = FindSuccessor(new_inner_loop, IrOpcode::kPhi);
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CheckInputs(new_inner_phi, T.jsgraph.OneConstant(), T.jsgraph.ZeroConstant(),
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new_inner_loop);
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CheckInputs(new_outer_phi, osr_phi, new_inner_phi, new_outer_loop);
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}
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TEST(Deconstruct_osr_nested2) {
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OsrDeconstructorTester T(1);
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// Test multiple backedge outer loop.
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While outer(T, T.p0, false, 2);
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While inner(T, T.p0, true);
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inner.Nest(outer);
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Node* outer_phi = outer.Phi(T.p0, T.p0, T.p0);
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outer.branch->ReplaceInput(0, outer_phi);
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Node* osr_phi = inner.Phi(T.jsgraph.OneConstant(), T.osr_values[0],
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T.jsgraph.ZeroConstant());
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inner.branch->ReplaceInput(0, osr_phi);
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outer_phi->ReplaceInput(1, osr_phi);
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outer_phi->ReplaceInput(2, T.jsgraph.ZeroConstant());
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Node* x_branch = T.graph.NewNode(T.common.Branch(), osr_phi, inner.exit);
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Node* x_true = T.graph.NewNode(T.common.IfTrue(), x_branch);
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Node* x_false = T.graph.NewNode(T.common.IfFalse(), x_branch);
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outer.loop->ReplaceInput(1, x_true);
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outer.loop->ReplaceInput(2, x_false);
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Node* ret =
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T.graph.NewNode(T.common.Return(), outer_phi, T.start, outer.exit);
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Node* end = T.graph.NewNode(T.common.End(), ret);
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T.graph.SetEnd(end);
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OsrHelper helper(0, 0);
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helper.Deconstruct(&T.jsgraph, &T.common, T.main_zone());
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// Check structure of deconstructed graph.
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// Check inner OSR loop is directly connected to start.
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CheckInputs(inner.loop, T.start, inner.if_true);
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CheckInputs(osr_phi, T.osr_values[0], T.jsgraph.ZeroConstant(), inner.loop);
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// Check control transfer to copy of outer loop.
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Node* new_merge = FindSuccessor(x_true, IrOpcode::kMerge);
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CHECK_EQ(new_merge, FindSuccessor(x_false, IrOpcode::kMerge));
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CheckInputs(new_merge, x_true, x_false);
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Node* new_outer_loop = FindSuccessor(new_merge, IrOpcode::kLoop);
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Node* new_outer_phi = FindSuccessor(new_outer_loop, IrOpcode::kPhi);
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CHECK_NE(new_outer_loop, outer.loop);
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CHECK_NE(new_outer_phi, outer_phi);
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Node* new_entry_phi = FindSuccessor(new_merge, IrOpcode::kPhi);
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CheckInputs(new_entry_phi, osr_phi, T.jsgraph.ZeroConstant(), new_merge);
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CHECK_EQ(new_merge, new_outer_loop->InputAt(0));
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// Check structure of outer loop.
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Node* new_outer_branch = FindSuccessor(new_outer_loop, IrOpcode::kBranch);
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CHECK_NE(new_outer_branch, outer.branch);
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CheckInputs(new_outer_branch, new_outer_phi, new_outer_loop);
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|
Node* new_outer_exit = FindSuccessor(new_outer_branch, IrOpcode::kIfFalse);
|
|
Node* new_outer_if_true = FindSuccessor(new_outer_branch, IrOpcode::kIfTrue);
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|
|
|
// Check structure of return.
|
|
end = T.graph.end();
|
|
Node* new_ret = end->InputAt(0);
|
|
CHECK_EQ(IrOpcode::kReturn, new_ret->opcode());
|
|
CheckInputs(new_ret, new_outer_phi, T.start, new_outer_exit);
|
|
|
|
// Check structure of inner loop.
|
|
Node* new_inner_loop = FindSuccessor(new_outer_if_true, IrOpcode::kLoop);
|
|
Node* new_inner_phi = FindSuccessor(new_inner_loop, IrOpcode::kPhi);
|
|
|
|
CheckInputs(new_inner_phi, T.jsgraph.OneConstant(), T.jsgraph.ZeroConstant(),
|
|
new_inner_loop);
|
|
CheckInputs(new_outer_phi, new_entry_phi, new_inner_phi,
|
|
T.jsgraph.ZeroConstant(), new_outer_loop);
|
|
}
|