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test/cctest/compiler/compiler/test-structured-machine-assembler.cc

Index: test/cctest/compiler/compiler/test-structured-machine-assembler.cc
diff --git a/test/cctest/compiler/compiler/test-structured-machine-assembler.cc b/test/cctest/compiler/compiler/test-structured-machine-assembler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c76654bfebf1a6a4f8a57772158c16043c8f948e
--- /dev/null
+++ b/test/cctest/compiler/compiler/test-structured-machine-assembler.cc
@@ -0,0 +1,1067 @@
+// 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/v8.h"
+#include "test/cctest/cctest.h"
+
+#include "src/base/utils/random-number-generator.h"
+#include "src/compiler/structured-machine-assembler.h"
+#include "test/cctest/compiler/codegen-tester.h"
+#include "test/cctest/compiler/value-helper.h"
+
+#if V8_TURBOFAN_TARGET
+
+using namespace v8::internal::compiler;
+
+typedef StructuredMachineAssembler::IfBuilder IfBuilder;
+typedef StructuredMachineAssembler::LoopBuilder Loop;
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class StructuredMachineAssemblerFriend {
+ public:
+  static bool VariableAlive(StructuredMachineAssembler* m,
+                            const Variable& var) {
+    CHECK(m->current_environment_ != NULL);
+    int offset = var.offset_;
+    return offset < static_cast<int>(m->CurrentVars()->size()) &&
+           m->CurrentVars()->at(offset) != NULL;
+  }
+};
+
+} } }  // namespace v8::internal::compiler
+
+
+TEST(RunVariable) {
+  StructuredMachineAssemblerTester<int32_t> m;
+
+  int32_t constant = 0x86c2bb16;
+
+  Variable v1 = m.NewVariable(m.Int32Constant(constant));
+  Variable v2 = m.NewVariable(v1.Get());
+  m.Return(v2.Get());
+
+  CHECK_EQ(constant, m.Call());
+}
+
+
+TEST(RunSimpleIf) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0xc4a3e3a6;
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Parameter(0)).Then();
+    m.Return(m.Int32Constant(constant));
+  }
+  m.Return(m.Word32Not(m.Int32Constant(constant)));
+
+  CHECK_EQ(~constant, m.Call(0));
+  CHECK_EQ(constant, m.Call(1));
+}
+
+
+TEST(RunSimpleIfVariable) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0xdb6f20c2;
+  Variable var = m.NewVariable(m.Int32Constant(constant));
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Parameter(0)).Then();
+    var.Set(m.Word32Not(var.Get()));
+  }
+  m.Return(var.Get());
+
+  CHECK_EQ(constant, m.Call(0));
+  CHECK_EQ(~constant, m.Call(1));
+}
+
+
+TEST(RunSimpleElse) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0xfc5eadf4;
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Parameter(0)).Else();
+    m.Return(m.Int32Constant(constant));
+  }
+  m.Return(m.Word32Not(m.Int32Constant(constant)));
+
+  CHECK_EQ(constant, m.Call(0));
+  CHECK_EQ(~constant, m.Call(1));
+}
+
+
+TEST(RunSimpleIfElse) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0xaa9c8cd3;
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Parameter(0)).Then();
+    m.Return(m.Int32Constant(constant));
+    cond.Else();
+    m.Return(m.Word32Not(m.Int32Constant(constant)));
+  }
+
+  CHECK_EQ(~constant, m.Call(0));
+  CHECK_EQ(constant, m.Call(1));
+}
+
+
+TEST(RunSimpleIfElseVariable) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0x67b6f39c;
+  Variable var = m.NewVariable(m.Int32Constant(constant));
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Parameter(0)).Then();
+    var.Set(m.Word32Not(m.Word32Not(var.Get())));
+    cond.Else();
+    var.Set(m.Word32Not(var.Get()));
+  }
+  m.Return(var.Get());
+
+  CHECK_EQ(~constant, m.Call(0));
+  CHECK_EQ(constant, m.Call(1));
+}
+
+
+TEST(RunSimpleIfNoThenElse) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0xd5e550ed;
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Parameter(0));
+  }
+  m.Return(m.Int32Constant(constant));
+
+  CHECK_EQ(constant, m.Call(0));
+  CHECK_EQ(constant, m.Call(1));
+}
+
+
+TEST(RunSimpleConjunctionVariable) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0xf8fb9ec6;
+  Variable var = m.NewVariable(m.Int32Constant(constant));
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Int32Constant(1)).And();
+    var.Set(m.Word32Not(var.Get()));
+    cond.If(m.Parameter(0)).Then();
+    var.Set(m.Word32Not(m.Word32Not(var.Get())));
+    cond.Else();
+    var.Set(m.Word32Not(var.Get()));
+  }
+  m.Return(var.Get());
+
+  CHECK_EQ(constant, m.Call(0));
+  CHECK_EQ(~constant, m.Call(1));
+}
+
+
+TEST(RunSimpleDisjunctionVariable) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0x118f6ffc;
+  Variable var = m.NewVariable(m.Int32Constant(constant));
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Int32Constant(0)).Or();
+    var.Set(m.Word32Not(var.Get()));
+    cond.If(m.Parameter(0)).Then();
+    var.Set(m.Word32Not(m.Word32Not(var.Get())));
+    cond.Else();
+    var.Set(m.Word32Not(var.Get()));
+  }
+  m.Return(var.Get());
+
+  CHECK_EQ(constant, m.Call(0));
+  CHECK_EQ(~constant, m.Call(1));
+}
+
+
+TEST(RunIfElse) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  {
+    IfBuilder cond(&m);
+    bool first = true;
+    FOR_INT32_INPUTS(i) {
+      Node* c = m.Int32Constant(*i);
+      if (first) {
+        cond.If(m.Word32Equal(m.Parameter(0), c)).Then();
+        m.Return(c);
+        first = false;
+      } else {
+        cond.Else();
+        cond.If(m.Word32Equal(m.Parameter(0), c)).Then();
+        m.Return(c);
+      }
+    }
+  }
+  m.Return(m.Int32Constant(333));
+
+  FOR_INT32_INPUTS(i) { CHECK_EQ(*i, m.Call(*i)); }
+}
+
+
+enum IfBuilderBranchType {
+  kSkipBranch, kBranchFallsThrough, kBranchReturns
+};
+
+
+static IfBuilderBranchType all_branch_types[] = {
+  kSkipBranch, kBranchFallsThrough, kBranchReturns
+};
+
+
+static void RunIfBuilderDisjunction(size_t max, IfBuilderBranchType then_type,
+                                    IfBuilderBranchType else_type) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  std::vector<int32_t> inputs = ValueHelper::int32_vector();
+  std::vector<int32_t>::const_iterator i = inputs.begin();
+  int32_t hit = 0x8c723c9a;
+  int32_t miss = 0x88a6b9f3;
+  {
+    Node* p0 = m.Parameter(0);
+    IfBuilder cond(&m);
+    for (size_t j = 0; j < max; j++, ++i) {
+      CHECK(i != inputs.end());  // Thank you STL.
+      if (j > 0) cond.Or();
+      cond.If(m.Word32Equal(p0, m.Int32Constant(*i)));
+    }
+    switch (then_type) {
+      case kSkipBranch:
+        break;
+      case kBranchFallsThrough:
+        cond.Then();
+        break;
+      case kBranchReturns:
+        cond.Then();
+        m.Return(m.Int32Constant(hit));
+        break;
+    }
+    switch (else_type) {
+      case kSkipBranch:
+        break;
+      case kBranchFallsThrough:
+        cond.Else();
+        break;
+      case kBranchReturns:
+        cond.Else();
+        m.Return(m.Int32Constant(miss));
+        break;
+    }
+  }
+  if (then_type != kBranchReturns || else_type != kBranchReturns) {
+    m.Return(m.Int32Constant(miss));
+  }
+
+  if (then_type != kBranchReturns) hit = miss;
+
+  i = inputs.begin();
+  for (size_t j = 0; i != inputs.end(); j++, ++i) {
+    int32_t result = m.Call(*i);
+    CHECK_EQ(j < max ? hit : miss, result);
+  }
+}
+
+
+TEST(RunIfBuilderDisjunction) {
+  size_t len = ValueHelper::int32_vector().size() - 1;
+  size_t max = len > 10 ? 10 : len - 1;
+  for (size_t i = 0; i < ARRAY_SIZE(all_branch_types); i++) {
+    for (size_t j = 0; j < ARRAY_SIZE(all_branch_types); j++) {
+      for (size_t size = 1; size < max; size++) {
+        RunIfBuilderDisjunction(size, all_branch_types[i], all_branch_types[j]);
+      }
+      RunIfBuilderDisjunction(len, all_branch_types[i], all_branch_types[j]);
+    }
+  }
+}
+
+
+static void RunIfBuilderConjunction(size_t max, IfBuilderBranchType then_type,
+                                    IfBuilderBranchType else_type) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  std::vector<int32_t> inputs = ValueHelper::int32_vector();
+  std::vector<int32_t>::const_iterator i = inputs.begin();
+  int32_t hit = 0xa0ceb9ca;
+  int32_t miss = 0x226cafaa;
+  {
+    IfBuilder cond(&m);
+    Node* p0 = m.Parameter(0);
+    for (size_t j = 0; j < max; j++, ++i) {
+      if (j > 0) cond.And();
+      cond.If(m.Word32NotEqual(p0, m.Int32Constant(*i)));
+    }
+    switch (then_type) {
+      case kSkipBranch:
+        break;
+      case kBranchFallsThrough:
+        cond.Then();
+        break;
+      case kBranchReturns:
+        cond.Then();
+        m.Return(m.Int32Constant(hit));
+        break;
+    }
+    switch (else_type) {
+      case kSkipBranch:
+        break;
+      case kBranchFallsThrough:
+        cond.Else();
+        break;
+      case kBranchReturns:
+        cond.Else();
+        m.Return(m.Int32Constant(miss));
+        break;
+    }
+  }
+  if (then_type != kBranchReturns || else_type != kBranchReturns) {
+    m.Return(m.Int32Constant(miss));
+  }
+
+  if (then_type != kBranchReturns) hit = miss;
+
+  i = inputs.begin();
+  for (size_t j = 0; i != inputs.end(); j++, ++i) {
+    int32_t result = m.Call(*i);
+    CHECK_EQ(j >= max ? hit : miss, result);
+  }
+}
+
+
+TEST(RunIfBuilderConjunction) {
+  size_t len = ValueHelper::int32_vector().size() - 1;
+  size_t max = len > 10 ? 10 : len - 1;
+  for (size_t i = 0; i < ARRAY_SIZE(all_branch_types); i++) {
+    for (size_t j = 0; j < ARRAY_SIZE(all_branch_types); j++) {
+      for (size_t size = 1; size < max; size++) {
+        RunIfBuilderConjunction(size, all_branch_types[i], all_branch_types[j]);
+      }
+      RunIfBuilderConjunction(len, all_branch_types[i], all_branch_types[j]);
+    }
+  }
+}
+
+
+static void RunDisjunctionVariables(int disjunctions,
+                                    bool explicit_then,
+                                    bool explicit_else) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0x65a09535;
+
+  Node* cmp_val = m.Int32Constant(constant);
+  Node* one = m.Int32Constant(1);
+  Variable var = m.NewVariable(m.Parameter(0));
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Word32Equal(var.Get(), cmp_val));
+    for (int i = 0; i < disjunctions; i++) {
+      cond.Or();
+      var.Set(m.Int32Add(var.Get(), one));
+      cond.If(m.Word32Equal(var.Get(), cmp_val));
+    }
+    if (explicit_then) {
+      cond.Then();
+    }
+    if (explicit_else) {
+      cond.Else();
+      var.Set(m.Int32Add(var.Get(), one));
+    }
+  }
+  m.Return(var.Get());
+
+  int adds = disjunctions + (explicit_else ? 1 : 0);
+  int32_t input = constant - 2 * adds;
+  for (int i = 0; i < adds; i++) {
+    CHECK_EQ(input + adds, m.Call(input));
+    input++;
+  }
+  for (int i = 0; i < adds + 1; i++) {
+    CHECK_EQ(constant, m.Call(input));
+    input++;
+  }
+  for (int i = 0; i < adds; i++) {
+    CHECK_EQ(input + adds, m.Call(input));
+    input++;
+  }
+}
+
+
+TEST(RunDisjunctionVariables) {
+  for (int disjunctions = 0; disjunctions < 10; disjunctions++) {
+    RunDisjunctionVariables(disjunctions, false, false);
+    RunDisjunctionVariables(disjunctions, false, true);
+    RunDisjunctionVariables(disjunctions, true, false);
+    RunDisjunctionVariables(disjunctions, true, true);
+  }
+}
+
+
+static void RunConjunctionVariables(int conjunctions,
+                                    bool explicit_then,
+                                    bool explicit_else) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  int32_t constant = 0x2c7f4b45;
+  Node* cmp_val = m.Int32Constant(constant);
+  Node* one = m.Int32Constant(1);
+  Variable var = m.NewVariable(m.Parameter(0));
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Word32NotEqual(var.Get(), cmp_val));
+    for (int i = 0; i < conjunctions; i++) {
+      cond.And();
+      var.Set(m.Int32Add(var.Get(), one));
+      cond.If(m.Word32NotEqual(var.Get(), cmp_val));
+    }
+    if (explicit_then) {
+      cond.Then();
+      var.Set(m.Int32Add(var.Get(), one));
+    }
+    if (explicit_else) {
+      cond.Else();
+    }
+  }
+  m.Return(var.Get());
+
+  int adds = conjunctions + (explicit_then ? 1 : 0);
+  int32_t input = constant - 2 * adds;
+  for (int i = 0; i < adds; i++) {
+    CHECK_EQ(input + adds, m.Call(input));
+    input++;
+  }
+  for (int i = 0; i < adds + 1; i++) {
+    CHECK_EQ(constant, m.Call(input));
+    input++;
+  }
+  for (int i = 0; i < adds; i++) {
+    CHECK_EQ(input + adds, m.Call(input));
+    input++;
+  }
+}
+
+
+TEST(RunConjunctionVariables) {
+  for (int conjunctions = 0; conjunctions < 10; conjunctions++) {
+    RunConjunctionVariables(conjunctions, false, false);
+    RunConjunctionVariables(conjunctions, false, true);
+    RunConjunctionVariables(conjunctions, true, false);
+    RunConjunctionVariables(conjunctions, true, true);
+  }
+}
+
+
+TEST(RunSimpleNestedIf) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32, kMachineWord32);
+  const size_t NUM_VALUES = 7;
+  std::vector<int32_t> inputs = ValueHelper::int32_vector();
+  CHECK(inputs.size() >= NUM_VALUES);
+  Node* values[NUM_VALUES];
+  for (size_t j = 0; j < NUM_VALUES; j++) {
+    values[j] = m.Int32Constant(inputs[j]);
+  }
+  {
+    IfBuilder if_0(&m);
+    if_0.If(m.Word32Equal(m.Parameter(0), values[0])).Then();
+    {
+      IfBuilder if_1(&m);
+      if_1.If(m.Word32Equal(m.Parameter(1), values[1])).Then();
+      {
+        m.Return(values[3]);
+      }
+      if_1.Else();
+      {
+        m.Return(values[4]);
+      }
+    }
+    if_0.Else();
+    {
+      IfBuilder if_1(&m);
+      if_1.If(m.Word32Equal(m.Parameter(1), values[2])).Then();
+      {
+        m.Return(values[5]);
+      }
+      if_1.Else();
+      {
+        m.Return(values[6]);
+      }
+    }
+  }
+
+  int32_t result = m.Call(inputs[0], inputs[1]);
+  CHECK_EQ(inputs[3], result);
+
+  result = m.Call(inputs[0], inputs[1] + 1);
+  CHECK_EQ(inputs[4], result);
+
+  result = m.Call(inputs[0] + 1, inputs[2]);
+  CHECK_EQ(inputs[5], result);
+
+  result = m.Call(inputs[0] + 1, inputs[2] + 1);
+  CHECK_EQ(inputs[6], result);
+}
+
+
+TEST(RunUnreachableBlockAfterIf) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  {
+    IfBuilder cond(&m);
+    cond.If(m.Int32Constant(0)).Then();
+    m.Return(m.Int32Constant(1));
+    cond.Else();
+    m.Return(m.Int32Constant(2));
+  }
+  // This is unreachable.
+  m.Return(m.Int32Constant(3));
+  CHECK_EQ(2, m.Call());
+}
+
+
+TEST(RunUnreachableBlockAfterLoop) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  {
+    Loop loop(&m);
+    m.Return(m.Int32Constant(1));
+  }
+  // This is unreachable.
+  m.Return(m.Int32Constant(3));
+  CHECK_EQ(1, m.Call());
+}
+
+
+TEST(RunSimpleLoop) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  int32_t constant = 0x120c1f85;
+  {
+    Loop loop(&m);
+    m.Return(m.Int32Constant(constant));
+  }
+  CHECK_EQ(constant, m.Call());
+}
+
+
+TEST(RunSimpleLoopBreak) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  int32_t constant = 0x10ddb0a6;
+  {
+    Loop loop(&m);
+    loop.Break();
+  }
+  m.Return(m.Int32Constant(constant));
+  CHECK_EQ(constant, m.Call());
+}
+
+
+TEST(RunCountToTen) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  Variable i = m.NewVariable(m.Int32Constant(0));
+  Node* ten = m.Int32Constant(10);
+  Node* one = m.Int32Constant(1);
+  {
+    Loop loop(&m);
+    {
+      IfBuilder cond(&m);
+      cond.If(m.Word32Equal(i.Get(), ten)).Then();
+      loop.Break();
+    }
+    i.Set(m.Int32Add(i.Get(), one));
+  }
+  m.Return(i.Get());
+  CHECK_EQ(10, m.Call());
+}
+
+
+TEST(RunCountToTenAcc) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  int32_t constant = 0xf27aed64;
+  Variable i = m.NewVariable(m.Int32Constant(0));
+  Variable var = m.NewVariable(m.Int32Constant(constant));
+  Node* ten = m.Int32Constant(10);
+  Node* one = m.Int32Constant(1);
+  {
+    Loop loop(&m);
+    {
+      IfBuilder cond(&m);
+      cond.If(m.Word32Equal(i.Get(), ten)).Then();
+      loop.Break();
+    }
+    i.Set(m.Int32Add(i.Get(), one));
+    var.Set(m.Int32Add(var.Get(), i.Get()));
+  }
+  m.Return(var.Get());
+
+  CHECK_EQ(constant + 10 + 9 * 5, m.Call());
+}
+
+
+TEST(RunSimpleNestedLoop) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  Node* zero = m.Int32Constant(0);
+  Node* one = m.Int32Constant(1);
+  Node* two = m.Int32Constant(2);
+  Node* three = m.Int32Constant(3);
+  {
+    Loop l1(&m);
+    {
+      Loop l2(&m);
+      {
+        IfBuilder cond(&m);
+        cond.If(m.Word32Equal(m.Parameter(0), one)).Then();
+        l1.Break();
+      }
+      {
+        Loop l3(&m);
+        {
+          IfBuilder cond(&m);
+          cond.If(m.Word32Equal(m.Parameter(0), two)).Then();
+          l2.Break();
+          cond.Else();
+          cond.If(m.Word32Equal(m.Parameter(0), three)).Then();
+          l3.Break();
+        }
+        m.Return(three);
+      }
+      m.Return(two);
+    }
+    m.Return(one);
+  }
+  m.Return(zero);
+
+  CHECK_EQ(0, m.Call(1));
+  CHECK_EQ(1, m.Call(2));
+  CHECK_EQ(2, m.Call(3));
+  CHECK_EQ(3, m.Call(4));
+}
+
+
+TEST(RunFib) {
+  StructuredMachineAssemblerTester<int32_t> m(kMachineWord32);
+
+  // Constants.
+  Node* zero = m.Int32Constant(0);
+  Node* one = m.Int32Constant(1);
+  Node* two = m.Int32Constant(2);
+  // Variables.
+  // cnt = input
+  Variable cnt = m.NewVariable(m.Parameter(0));
+  // if (cnt < 2) return i
+  {
+    IfBuilder lt2(&m);
+    lt2.If(m.Int32LessThan(cnt.Get(), two)).Then();
+    m.Return(cnt.Get());
+  }
+  // cnt -= 2
+  cnt.Set(m.Int32Sub(cnt.Get(), two));
+  // res = 1
+  Variable res = m.NewVariable(one);
+  {
+    // prv_0 = 1
+    // prv_1 = 1
+    Variable prv_0 = m.NewVariable(one);
+    Variable prv_1 = m.NewVariable(one);
+    // while (cnt != 0) {
+    Loop main(&m);
+    {
+      IfBuilder nz(&m);
+      nz.If(m.Word32Equal(cnt.Get(), zero)).Then();
+      main.Break();
+    }
+    // res = prv_0 + prv_1
+    // prv_0 = prv_1
+    // prv_1 = res
+    res.Set(m.Int32Add(prv_0.Get(), prv_1.Get()));
+    prv_0.Set(prv_1.Get());
+    prv_1.Set(res.Get());
+    // cnt--
+    cnt.Set(m.Int32Sub(cnt.Get(), one));
+  }
+  m.Return(res.Get());
+
+  int32_t values[] = {0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144};
+  for (size_t i = 0; i < ARRAY_SIZE(values); i++) {
+    CHECK_EQ(values[i], m.Call(static_cast<int32_t>(i)));
+  }
+}
+
+
+static int VariableIntroduction() {
+  while (true) {
+    int ret = 0;
+    for (int i = 0; i < 10; i++) {
+      for (int j = i; j < 10; j++) {
+        for (int k = j; k < 10; k++) {
+          ret++;
+        }
+        ret++;
+      }
+      ret++;
+    }
+    return ret;
+  }
+}
+
+
+TEST(RunVariableIntroduction) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  Node* zero = m.Int32Constant(0);
+  Node* one = m.Int32Constant(1);
+  // Use an IfBuilder to get out of start block.
+  {
+    IfBuilder i0(&m);
+    i0.If(zero).Then();
+    m.Return(one);
+  }
+  Node* ten = m.Int32Constant(10);
+  Variable v0 =
+      m.NewVariable(zero);  // Introduce variable outside of start block.
+  {
+    Loop l0(&m);
+    Variable ret = m.NewVariable(zero);  // Introduce loop variable.
+    {
+      Loop l1(&m);
+      {
+        IfBuilder i1(&m);
+        i1.If(m.Word32Equal(v0.Get(), ten)).Then();
+        l1.Break();
+      }
+      Variable v1 = m.NewVariable(v0.Get());  // Introduce loop variable.
+      {
+        Loop l2(&m);
+        {
+          IfBuilder i2(&m);
+          i2.If(m.Word32Equal(v1.Get(), ten)).Then();
+          l2.Break();
+        }
+        Variable v2 = m.NewVariable(v1.Get());  // Introduce loop variable.
+        {
+          Loop l3(&m);
+          {
+            IfBuilder i3(&m);
+            i3.If(m.Word32Equal(v2.Get(), ten)).Then();
+            l3.Break();
+          }
+          ret.Set(m.Int32Add(ret.Get(), one));
+          v2.Set(m.Int32Add(v2.Get(), one));
+        }
+        ret.Set(m.Int32Add(ret.Get(), one));
+        v1.Set(m.Int32Add(v1.Get(), one));
+      }
+      ret.Set(m.Int32Add(ret.Get(), one));
+      v0.Set(m.Int32Add(v0.Get(), one));
+    }
+    m.Return(ret.Get());  // Return loop variable.
+  }
+  CHECK_EQ(VariableIntroduction(), m.Call());
+}
+
+
+TEST(RunIfBuilderVariableLiveness) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  typedef i::compiler::StructuredMachineAssemblerFriend F;
+  Node* zero = m.Int32Constant(0);
+  Variable v_outer = m.NewVariable(zero);
+  IfBuilder cond(&m);
+  cond.If(zero).Then();
+  Variable v_then = m.NewVariable(zero);
+  CHECK(F::VariableAlive(&m, v_outer));
+  CHECK(F::VariableAlive(&m, v_then));
+  cond.Else();
+  Variable v_else = m.NewVariable(zero);
+  CHECK(F::VariableAlive(&m, v_outer));
+  CHECK(F::VariableAlive(&m, v_else));
+  CHECK(!F::VariableAlive(&m, v_then));
+  cond.End();
+  CHECK(F::VariableAlive(&m, v_outer));
+  CHECK(!F::VariableAlive(&m, v_then));
+  CHECK(!F::VariableAlive(&m, v_else));
+}
+
+
+TEST(RunSimpleExpression1) {
+  StructuredMachineAssemblerTester<int32_t> m;
+
+  int32_t constant = 0x0c2974ef;
+  Node* zero = m.Int32Constant(0);
+  Node* one = m.Int32Constant(1);
+  {
+    // if (((1 && 1) && 1) && 1) return constant; return 0;
+    IfBuilder cond(&m);
+    cond.OpenParen();
+    cond.OpenParen().If(one).And();
+    cond.If(one).CloseParen().And();
+    cond.If(one).CloseParen().And();
+    cond.If(one).Then();
+    m.Return(m.Int32Constant(constant));
+  }
+  m.Return(zero);
+
+  CHECK_EQ(constant, m.Call());
+}
+
+
+TEST(RunSimpleExpression2) {
+  StructuredMachineAssemblerTester<int32_t> m;
+
+  int32_t constant = 0x2eddc11b;
+  Node* zero = m.Int32Constant(0);
+  Node* one = m.Int32Constant(1);
+  {
+    // if (((0 || 1) && 1) && 1) return constant; return 0;
+    IfBuilder cond(&m);
+    cond.OpenParen();
+    cond.OpenParen().If(zero).Or();
+    cond.If(one).CloseParen().And();
+    cond.If(one).CloseParen().And();
+    cond.If(one).Then();
+    m.Return(m.Int32Constant(constant));
+  }
+  m.Return(zero);
+
+  CHECK_EQ(constant, m.Call());
+}
+
+
+TEST(RunSimpleExpression3) {
+  StructuredMachineAssemblerTester<int32_t> m;
+
+  int32_t constant = 0x9ed5e9ef;
+  Node* zero = m.Int32Constant(0);
+  Node* one = m.Int32Constant(1);
+  {
+    // if (1 && ((0 || 1) && 1) && 1) return constant; return 0;
+    IfBuilder cond(&m);
+    cond.If(one).And();
+    cond.OpenParen();
+    cond.OpenParen().If(zero).Or();
+    cond.If(one).CloseParen().And();
+    cond.If(one).CloseParen().And();
+    cond.If(one).Then();
+    m.Return(m.Int32Constant(constant));
+  }
+  m.Return(zero);
+
+  CHECK_EQ(constant, m.Call());
+}
+
+
+TEST(RunSimpleExpressionVariable1) {
+  StructuredMachineAssemblerTester<int32_t> m;
+
+  int32_t constant = 0x4b40a986;
+  Node* one = m.Int32Constant(1);
+  Variable var = m.NewVariable(m.Int32Constant(constant));
+  {
+    // if (var.Get() && ((!var || var) && var) && var) {} return var;
+    // incrementing var in each environment.
+    IfBuilder cond(&m);
+    cond.If(var.Get()).And();
+    var.Set(m.Int32Add(var.Get(), one));
+    cond.OpenParen().OpenParen().If(m.Word32BinaryNot(var.Get())).Or();
+    var.Set(m.Int32Add(var.Get(), one));
+    cond.If(var.Get()).CloseParen().And();
+    var.Set(m.Int32Add(var.Get(), one));
+    cond.If(var.Get()).CloseParen().And();
+    var.Set(m.Int32Add(var.Get(), one));
+    cond.If(var.Get());
+  }
+  m.Return(var.Get());
+
+  CHECK_EQ(constant + 4, m.Call());
+}
+
+
+class QuicksortHelper : public StructuredMachineAssemblerTester<int32_t> {
+ public:
+  QuicksortHelper()
+      : StructuredMachineAssemblerTester(
+            MachineOperatorBuilder::pointer_rep(), kMachineWord32,
+            MachineOperatorBuilder::pointer_rep(), kMachineWord32),
+        input_(NULL),
+        stack_limit_(NULL),
+        one_(Int32Constant(1)),
+        stack_frame_size_(Int32Constant(kFrameVariables * 4)),
+        left_offset_(Int32Constant(0 * 4)),
+        right_offset_(Int32Constant(1 * 4)) {
+    Build();
+  }
+
+  int32_t DoCall(int32_t* input, int32_t input_length) {
+    int32_t stack_space[20];
+    // Do call.
+    int32_t return_val = Call(input, input_length, stack_space,
+                              static_cast<int32_t>(ARRAY_SIZE(stack_space)));
+    // Ran out of stack space.
+    if (return_val != 0) return return_val;
+    // Check sorted.
+    int32_t last = input[0];
+    for (int32_t i = 0; i < input_length; i++) {
+      CHECK(last <= input[i]);
+      last = input[i];
+    }
+    return return_val;
+  }
+
+ private:
+  void Inc32(const Variable& var) { var.Set(Int32Add(var.Get(), one_)); }
+  Node* Index(Node* index) { return Word32Shl(index, Int32Constant(2)); }
+  Node* ArrayLoad(Node* index) {
+    return Load(kMachineWord32, input_, Index(index));
+  }
+  void Swap(Node* a_index, Node* b_index) {
+    Node* a = ArrayLoad(a_index);
+    Node* b = ArrayLoad(b_index);
+    Store(kMachineWord32, input_, Index(a_index), b);
+    Store(kMachineWord32, input_, Index(b_index), a);
+  }
+  void AddToCallStack(const Variable& fp, Node* left, Node* right) {
+    {
+      // Stack limit check.
+      IfBuilder cond(this);
+      cond.If(IntPtrLessThanOrEqual(fp.Get(), stack_limit_)).Then();
+      Return(Int32Constant(-1));
+    }
+    Store(kMachineWord32, fp.Get(), left_offset_, left);
+    Store(kMachineWord32, fp.Get(), right_offset_, right);
+    fp.Set(IntPtrAdd(fp.Get(), ConvertInt32ToIntPtr(stack_frame_size_)));
+  }
+  void Build() {
+    Variable left = NewVariable(Int32Constant(0));
+    Variable right =
+        NewVariable(Int32Sub(Parameter(kInputLengthParameter), one_));
+    input_ = Parameter(kInputParameter);
+    Node* top_of_stack = Parameter(kStackParameter);
+    stack_limit_ = IntPtrSub(
+        top_of_stack, ConvertInt32ToIntPtr(Parameter(kStackLengthParameter)));
+    Variable fp = NewVariable(top_of_stack);
+    {
+      Loop outermost(this);
+      // Edge case - 2 element array.
+      {
+        IfBuilder cond(this);
+        cond.If(Word32Equal(left.Get(), Int32Sub(right.Get(), one_))).And();
+        cond.If(Int32LessThanOrEqual(ArrayLoad(right.Get()),
+                                     ArrayLoad(left.Get()))).Then();
+        Swap(left.Get(), right.Get());
+      }
+      {
+        IfBuilder cond(this);
+        // Algorithm complete condition.
+        cond.If(WordEqual(top_of_stack, fp.Get())).And();
+        cond.If(Int32LessThanOrEqual(Int32Sub(right.Get(), one_), left.Get()))
+            .Then();
+        outermost.Break();
+        // 'Recursion' exit condition. Pop frame and continue.
+        cond.Else();
+        cond.If(Int32LessThanOrEqual(Int32Sub(right.Get(), one_), left.Get()))
+            .Then();
+        fp.Set(IntPtrSub(fp.Get(), ConvertInt32ToIntPtr(stack_frame_size_)));
+        left.Set(Load(kMachineWord32, fp.Get(), left_offset_));
+        right.Set(Load(kMachineWord32, fp.Get(), right_offset_));
+        outermost.Continue();
+      }
+      // Partition.
+      Variable store_index = NewVariable(left.Get());
+      {
+        Node* pivot_index =
+            Int32Div(Int32Add(left.Get(), right.Get()), Int32Constant(2));
+        Node* pivot = ArrayLoad(pivot_index);
+        Swap(pivot_index, right.Get());
+        Variable i = NewVariable(left.Get());
+        {
+          Loop partition(this);
+          {
+            IfBuilder cond(this);
+            // Parition complete.
+            cond.If(Word32Equal(i.Get(), right.Get())).Then();
+            partition.Break();
+            // Need swap.
+            cond.Else();
+            cond.If(Int32LessThanOrEqual(ArrayLoad(i.Get()), pivot)).Then();
+            Swap(i.Get(), store_index.Get());
+            Inc32(store_index);
+          }
+          Inc32(i);
+        }  // End partition loop.
+        Swap(store_index.Get(), right.Get());
+      }
+      // 'Recurse' left and right halves of partition.
+      // Tail recurse second one.
+      AddToCallStack(fp, left.Get(), Int32Sub(store_index.Get(), one_));
+      left.Set(Int32Add(store_index.Get(), one_));
+    }  // End outermost loop.
+    Return(Int32Constant(0));
+  }
+
+  static const int kFrameVariables = 2;  // left, right
+  // Parameter offsets.
+  static const int kInputParameter = 0;
+  static const int kInputLengthParameter = 1;
+  static const int kStackParameter = 2;
+  static const int kStackLengthParameter = 3;
+  // Function inputs.
+  Node* input_;
+  Node* stack_limit_;
+  // Constants.
+  Node* const one_;
+  // Frame constants.
+  Node* const stack_frame_size_;
+  Node* const left_offset_;
+  Node* const right_offset_;
+};
+
+
+TEST(RunSimpleQuicksort) {
+  QuicksortHelper m;
+  int32_t inputs[] = {9, 7, 1, 8, 11};
+  CHECK_EQ(0, m.DoCall(inputs, ARRAY_SIZE(inputs)));
+}
+
+
+TEST(RunRandomQuicksort) {
+  QuicksortHelper m;
+
+  v8::base::RandomNumberGenerator rng;
+  static const int kMaxLength = 40;
+  int32_t inputs[kMaxLength];
+
+  for (int length = 1; length < kMaxLength; length++) {
+    for (int i = 0; i < 70; i++) {
+      // Randomize inputs.
+      for (int j = 0; j < length; j++) {
+        inputs[j] = rng.NextInt(10) - 5;
+      }
+      CHECK_EQ(0, m.DoCall(inputs, length));
+    }
+  }
+}
+
+
+TEST(MultipleScopes) {
+  StructuredMachineAssemblerTester<int32_t> m;
+  for (int i = 0; i < 10; i++) {
+    IfBuilder b(&m);
+    b.If(m.Int32Constant(0)).Then();
+    m.NewVariable(m.Int32Constant(0));
+  }
+  m.Return(m.Int32Constant(0));
+  CHECK_EQ(0, m.Call());
+}
+
+#endif