Adds the x86-64 assembler.

unittest/AssemblerX8632/TestUtil.h

Index: unittest/AssemblerX8632/TestUtil.h
diff --git a/unittest/AssemblerX8632/TestUtil.h b/unittest/AssemblerX8632/TestUtil.h
new file mode 100644
index 0000000000000000000000000000000000000000..190a5dde05cf52871ab65601f9ecf4aa6f77dadf
--- /dev/null
+++ b/unittest/AssemblerX8632/TestUtil.h
@@ -0,0 +1,848 @@
+//===- subzero/unittest/unittest/AssemblerX8632/TestUtil.h ------*- C++ -*-===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Utility classes for testing the X8632 Assembler.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ASSEMBLERX8632_TESTUTIL_H_
+#define ASSEMBLERX8632_TESTUTIL_H_
+
+#include "IceAssemblerX8632.h"
+
+#include "gtest/gtest.h"
+
+#include <cassert>
+#include <sys/mman.h>
+
+namespace Ice {
+namespace X8632 {
+namespace Test {
+
+class AssemblerX8632TestBase : public ::testing::Test {
+protected:
+  using Address = AssemblerX8632::Traits::Address;
+  using ByteRegister = AssemblerX8632::Traits::ByteRegister;
+  using Cond = AssemblerX8632::Traits::Cond;
+  using GPRRegister = AssemblerX8632::Traits::GPRRegister;
+  using Traits = AssemblerX8632::Traits;
+  using XmmRegister = AssemblerX8632::Traits::XmmRegister;
+  using X87STRegister = AssemblerX8632::Traits::X87STRegister;
+
+  AssemblerX8632TestBase() { reset(); }
+
+  void reset() { Assembler.reset(new AssemblerX8632()); }
+
+  AssemblerX8632 *assembler() const { return Assembler.get(); }
+
+  size_t codeBytesSize() const { return Assembler->getBufferView().size(); }
+
+  const uint8_t *codeBytes() const {
+    return static_cast<const uint8_t *>(
+        static_cast<const void *>(Assembler->getBufferView().data()));
+  }
+
+private:
+  std::unique_ptr<AssemblerX8632> Assembler;
+};
+
+// __ is a helper macro. It allows test cases to emit X8632 assembly
+// instructions with
+//
+//   __ mov(GPRRegister::Reg_Eax, 1);
+//   __ ret();
+//
+// and so on. The idea of having this was "stolen" from dart's unit tests.
+#define __ (this->assembler())->
+
+// AssemblerX8632LowLevelTest verify that the "basic" instructions the tests
+// rely on are encoded correctly. Therefore, instead of executing the assembled
+// code, these tests will verify that the assembled bytes are sane.
+class AssemblerX8632LowLevelTest : public AssemblerX8632TestBase {
+protected:
+  // verifyBytes is a template helper that takes a Buffer, and a variable number
+  // of bytes. As the name indicates, it is used to verify the bytes for an
+  // instruction encoding.
+  template <int N, int I> static bool verifyBytes(const uint8_t *) {
+    static_assert(I == N, "Invalid template instantiation.");
+    return true;
+  }
+
+  template <int N, int I = 0, typename... Args>
+  static bool verifyBytes(const uint8_t *Buffer, uint8_t Byte,
+                          Args... OtherBytes) {
+    static_assert(I < N, "Invalid template instantiation.");
+    EXPECT_EQ(Byte, Buffer[I]) << "Byte " << (I + 1) << " of " << N;
+    return verifyBytes<N, I + 1>(Buffer, OtherBytes...) && Buffer[I] == Byte;
+  }
+};
+
+// After these tests we should have a sane environment; we know the following
+// work:
+//
+//  (*) zeroing eax, ebx, ecx, edx, edi, and esi;
+//  (*) call $4 instruction (used for ip materialization);
+//  (*) register push and pop;
+//  (*) cmp reg, reg; and
+//  (*) returning from functions.
+//
+// We can now dive into testing each emitting method in AssemblerX8632. Each
+// test will emit some instructions for performing the test. The assembled
+// instructions will operate in a "safe" environment. All x86-32 registers are
+// spilled to the program stack, and the registers are then zeroed out, with the
+// exception of %esp and %ebp.
+//
+// The jitted code and the unittest code will share the same stack. Therefore,
+// test harnesses need to ensure it does not leave anything it pushed on the
+// stack.
+//
+// %ebp is initialized with a pointer for rIP-based addressing. This pointer is
+// used for position-independent access to a scratchpad area for use in tests.
+// This mechanism is used because the test framework needs to generate addresses
+// that work on both x86-32 and x86-64 hosts, but are encodable using our x86-32
+// assembler. This is made possible because the encoding for
+//
+//    pushq %rax (x86-64 only)
+//
+// is the same as the one for
+//
+//    pushl %eax (x86-32 only; not encodable in x86-64)
+//
+// Likewise, the encodings for
+//
+//    movl offset(%ebp), %reg (32-bit only)
+//    movl <src>, offset(%ebp) (32-bit only)
+//
+// and
+//
+//    movl offset(%rbp), %reg (64-bit only)
+//    movl <src>, offset(%rbp) (64-bit only)
+//
+// are also the same.
+//
+// We use a call instruction in order to generate a natural sized address on the
+// stack. Said address is then removed from the stack with a pop %rBP, which can
+// then be used to address memory safely in either x86-32 or x86-64, as long as
+// the test code does not perform any arithmetic operation that writes to %rBP.
+// This PC materialization technique is very common in x86-32 PIC.
+//
+// %rBP is used to provide the tests with a scratchpad area that can safely and
+// portably be written to and read from. This scratchpad area is also used to
+// store the "final" values in eax, ebx, ecx, edx, esi, and edi, allowing the
+// harnesses access to 6 "return values" instead of the usual single return
+// value supported by C++.
+//
+// The jitted code will look like the following:
+//
+// test:
+//       push %eax
+//       push %ebx
+//       push %ecx
+//       push %edx
+//       push %edi
+//       push %esi
+//       push %ebp
+//       call test$materialize_ip
+// test$materialize_ip:                           <<------- %eBP will point here
+//       pop  %ebp
+//       mov  $0, %eax
+//       mov  $0, %ebx
+//       mov  $0, %ecx
+//       mov  $0, %edx
+//       mov  $0, %edi
+//       mov  $0, %esi
+//
+//       << test code goes here >>
+//
+//       mov %eax, { 0 + $ScratchpadOffset}(%ebp)
+//       mov %ebx, { 4 + $ScratchpadOffset}(%ebp)
+//       mov %ecx, { 8 + $ScratchpadOffset}(%ebp)
+//       mov %edx, {12 + $ScratchpadOffset}(%ebp)
+//       mov %edi, {16 + $ScratchpadOffset}(%ebp)
+//       mov %esi, {20 + $ScratchpadOffset}(%ebp)
+//       mov %ebp, {24 + $ScratchpadOffset}(%ebp)
+//       mov %esp, {28 + $ScratchpadOffset}(%ebp)
+//       movups %xmm0, {32 + $ScratchpadOffset}(%ebp)
+//       movups %xmm1, {48 + $ScratchpadOffset}(%ebp)
+//       movups %xmm2, {64 + $ScratchpadOffset}(%ebp)
+//       movusp %xmm3, {80 + $ScratchpadOffset}(%ebp)
+//       movusp %xmm4, {96 + $ScratchpadOffset}(%ebp)
+//       movusp %xmm5, {112 + $ScratchpadOffset}(%ebp)
+//       movusp %xmm6, {128 + $ScratchpadOffset}(%ebp)
+//       movusp %xmm7, {144 + $ScratchpadOffset}(%ebp)
+//
+//       pop %ebp
+//       pop %esi
+//       pop %edi
+//       pop %edx
+//       pop %ecx
+//       pop %ebx
+//       pop %eax
+//       ret
+//
+//      << ... >>
+//
+// scratchpad:                              <<------- accessed via $Offset(%ebp)
+//
+//      << test scratch area >>
+//
+// TODO(jpp): test the
+//
+//    mov %reg, $Offset(%ebp)
+//    movups %xmm, $Offset(%ebp)
+//
+// encodings using the low level assembler test ensuring that the register
+// values can be written to the scratchpad area.
+class AssemblerX8632Test : public AssemblerX8632TestBase {
+protected:
+  // Dqword is used to represent 128-bit data types. The Dqword's contents are
+  // the same as the contents read from memory. Tests can then use the union
+  // members to verify the tests' outputs.
+  //
+  // NOTE: We want sizeof(Dqword) == sizeof(uint64_t) * 2. In other words, we
+  // want Dqword's contents to be **exactly** what the memory contents were so
+  // that we can do, e.g.,
+  //
+  // ...
+  // float Ret[4];
+  // // populate Ret
+  // return *reinterpret_cast<Dqword *>(&Ret);
+  //
+  // While being an ugly hack, this kind of return statements are used
+  // extensively in the PackedArith (see below) class.
+  union Dqword {
+    template <typename T0, typename T1, typename T2, typename T3,
+              typename = typename std::enable_if<
+                  std::is_floating_point<T0>::value>::type>
+    Dqword(T0 F0, T1 F1, T2 F2, T3 F3) {
+      F32[0] = F0;
+      F32[1] = F1;
+      F32[2] = F2;
+      F32[3] = F3;
+    }
+
+    template <typename T>
+    Dqword(typename std::enable_if<std::is_same<T, int32_t>::value, T>::type I0,
+           T I1, T I2, T I3) {
+      I32[0] = I0;
+      I32[1] = I1;
+      I32[2] = I2;
+      I32[3] = I3;
+    }
+
+    template <typename T>
+    Dqword(typename std::enable_if<std::is_same<T, uint64_t>::value, T>::type
+               U64_0,
+           T U64_1) {
+      U64[0] = U64_0;
+      U64[1] = U64_1;
+    }
+
+    template <typename T>
+    Dqword(typename std::enable_if<std::is_same<T, double>::value, T>::type D0,
+           T D1) {
+      F64[0] = D0;
+      F64[1] = D1;
+    }
+
+    bool operator==(const Dqword &Rhs) const {
+      return std::memcmp(this, &Rhs, sizeof(*this)) == 0;
+    }
+
+    double F64[2];
+    uint64_t U64[2];
+    int64_t I64[2];
+
+    float F32[4];
+    uint32_t U32[4];
+    int32_t I32[4];
+
+    uint16_t U16[8];
+    int16_t I16[8];
+
+    uint8_t U8[16];
+    int8_t I8[16];
+
+  private:
+    Dqword() = delete;
+  };
+
+  // As stated, we want this condition to hold, so we assert.
+  static_assert(sizeof(Dqword) == 2 * sizeof(uint64_t),
+                "Dqword has the wrong size.");
+
+  // PackedArith is an interface provider for Dqwords. PackedArith's C argument
+  // is the undelying Dqword's type, which is then used so that we can define
+  // operators in terms of C++ operators on the underlying elements' type.
+  template <typename C> class PackedArith {
+  public:
+    static constexpr uint32_t N = sizeof(Dqword) / sizeof(C);
+    static_assert(N * sizeof(C) == sizeof(Dqword),
+                  "Invalid template paramenter.");
+    static_assert((N & 1) == 0, "N should be divisible by 2");
+
+#define DefinePackedComparisonOperator(Op)                                     \
+  template <typename Container = C, int Size = N>                              \
+  typename std::enable_if<std::is_floating_point<Container>::value,            \
+                          Dqword>::type                                        \
+  operator Op(const Dqword &Rhs) const {                                       \
+    using ElemType =                                                           \
+        typename std::conditional<std::is_same<float, Container>::value,       \
+                                  int32_t, int64_t>::type;                     \
+    static_assert(sizeof(ElemType) == sizeof(Container),                       \
+                  "Check ElemType definition.");                               \
+    const ElemType *const RhsPtr =                                             \
+        reinterpret_cast<const ElemType *const>(&Rhs);                         \
+    const ElemType *const LhsPtr =                                             \
+        reinterpret_cast<const ElemType *const>(&Lhs);                         \
+    ElemType Ret[N];                                                           \
+    for (uint32_t i = 0; i < N; ++i) {                                         \
+      Ret[i] = (LhsPtr[i] Op RhsPtr[i]) ? -1 : 0;                              \
+    }                                                                          \
+    return *reinterpret_cast<Dqword *>(&Ret);                                  \
+  }
+
+    DefinePackedComparisonOperator(< );
+    DefinePackedComparisonOperator(<= );
+    DefinePackedComparisonOperator(> );
+    DefinePackedComparisonOperator(>= );
+    DefinePackedComparisonOperator(== );
+    DefinePackedComparisonOperator(!= );
+
+#undef DefinePackedComparisonOperator
+
+#define DefinePackedOrdUnordComparisonOperator(Op, Ordered)                    \
+  template <typename Container = C, int Size = N>                              \
+  typename std::enable_if<std::is_floating_point<Container>::value,            \
+                          Dqword>::type                                        \
+  Op(const Dqword &Rhs) const {                                                \
+    using ElemType =                                                           \
+        typename std::conditional<std::is_same<float, Container>::value,       \
+                                  int32_t, int64_t>::type;                     \
+    static_assert(sizeof(ElemType) == sizeof(Container),                       \
+                  "Check ElemType definition.");                               \
+    const Container *const RhsPtr =                                            \
+        reinterpret_cast<const Container *const>(&Rhs);                        \
+    const Container *const LhsPtr =                                            \
+        reinterpret_cast<const Container *const>(&Lhs);                        \
+    ElemType Ret[N];                                                           \
+    for (uint32_t i = 0; i < N; ++i) {                                         \
+      Ret[i] = (!(LhsPtr[i] == LhsPtr[i]) || !(RhsPtr[i] == RhsPtr[i])) !=     \
+                       (Ordered)                                               \
+                   ? -1                                                        \
+                   : 0;                                                        \
+    }                                                                          \
+    return *reinterpret_cast<Dqword *>(&Ret);                                  \
+  }
+
+    DefinePackedOrdUnordComparisonOperator(ord, true);
+    DefinePackedOrdUnordComparisonOperator(unord, false);
+#undef DefinePackedOrdUnordComparisonOperator
+
+#define DefinePackedArithOperator(Op, RhsIndexChanges, NeedsInt)               \
+  template <typename Container = C, int Size = N>                              \
+  Dqword operator Op(const Dqword &Rhs) const {                                \
+    using ElemTypeForFp = typename std::conditional<                           \
+        !(NeedsInt), Container,                                                \
+        typename std::conditional<                                             \
+            std::is_same<Container, float>::value, uint32_t,                   \
+            typename std::conditional<std::is_same<Container, double>::value,  \
+                                      uint64_t, void>::type>::type>::type;     \
+    using ElemType =                                                           \
+        typename std::conditional<std::is_integral<Container>::value,          \
+                                  Container, ElemTypeForFp>::type;             \
+    static_assert(!std::is_same<void, ElemType>::value,                        \
+                  "Check ElemType definition.");                               \
+    const ElemType *const RhsPtr =                                             \
+        reinterpret_cast<const ElemType *const>(&Rhs);                         \
+    const ElemType *const LhsPtr =                                             \
+        reinterpret_cast<const ElemType *const>(&Lhs);                         \
+    ElemType Ret[N];                                                           \
+    for (uint32_t i = 0; i < N; ++i) {                                         \
+      Ret[i] = LhsPtr[i] Op RhsPtr[(RhsIndexChanges) ? i : 0];                 \
+    }                                                                          \
+    return *reinterpret_cast<Dqword *>(&Ret);                                  \
+  }
+
+    DefinePackedArithOperator(>>, false, true);
+    DefinePackedArithOperator(<<, false, true);
+    DefinePackedArithOperator(+, true, false);
+    DefinePackedArithOperator(-, true, false);
+    DefinePackedArithOperator(/, true, false);
+    DefinePackedArithOperator(&, true, true);
+    DefinePackedArithOperator(|, true, true);
+    DefinePackedArithOperator (^, true, true);
+
+#undef DefinePackedArithOperator
+
+#define DefinePackedArithShiftImm(Op)                                          \
+  template <typename Container = C, int Size = N>                              \
+  Dqword operator Op(uint8_t imm) const {                                      \
+    const Container *const LhsPtr =                                            \
+        reinterpret_cast<const Container *const>(&Lhs);                        \
+    Container Ret[N];                                                          \
+    for (uint32_t i = 0; i < N; ++i) {                                         \
+      Ret[i] = LhsPtr[i] Op imm;                                               \
+    }                                                                          \
+    return *reinterpret_cast<Dqword *>(&Ret);                                  \
+  }
+
+    DefinePackedArithShiftImm(>> );
+    DefinePackedArithShiftImm(<< );
+
+#undef DefinePackedArithShiftImm
+
+    template <typename Container = C, int Size = N>
+    typename std::enable_if<std::is_signed<Container>::value ||
+                                std::is_floating_point<Container>::value,
+                            Dqword>::type
+    operator*(const Dqword &Rhs) const {
+      static_assert((std::is_integral<Container>::value &&
+                     sizeof(Container) < sizeof(uint64_t)) ||
+                        std::is_floating_point<Container>::value,
+                    "* is only defined for i(8|16|32), and fp types.");
+
+      const Container *const RhsPtr =
+          reinterpret_cast<const Container *const>(&Rhs);
+      const Container *const LhsPtr =
+          reinterpret_cast<const Container *const>(&Lhs);
+      Container Ret[Size];
+      for (uint32_t i = 0; i < Size; ++i) {
+        Ret[i] = LhsPtr[i] * RhsPtr[i];
+      }
+      return *reinterpret_cast<Dqword *>(&Ret);
+    }
+
+    template <typename Container = C, int Size = N,
+              typename = typename std::enable_if<
+                  !std::is_signed<Container>::value>::type>
+    Dqword operator*(const Dqword &Rhs) const {
+      static_assert(std::is_integral<Container>::value &&
+                        sizeof(Container) < sizeof(uint64_t),
+                    "* is only defined for ui(8|16|32)");
+      using NextType = typename std::conditional<
+          sizeof(Container) == 1, uint16_t,
+          typename std::conditional<sizeof(Container) == 2, uint32_t,
+                                    uint64_t>::type>::type;
+      static_assert(sizeof(Container) * 2 == sizeof(NextType),
+                    "Unexpected size");
+
+      const Container *const RhsPtr =
+          reinterpret_cast<const Container *const>(&Rhs);
+      const Container *const LhsPtr =
+          reinterpret_cast<const Container *const>(&Lhs);
+      NextType Ret[Size / 2];
+      for (uint32_t i = 0; i < Size; i += 2) {
+        Ret[i / 2] =
+            static_cast<NextType>(LhsPtr[i]) * static_cast<NextType>(RhsPtr[i]);
+      }
+      return *reinterpret_cast<Dqword *>(&Ret);
+    }
+
+    template <typename Container = C, int Size = N>
+    PackedArith<Container> operator~() const {
+      const Container *const LhsPtr =
+          reinterpret_cast<const Container *const>(&Lhs);
+      Container Ret[Size];
+      for (uint32_t i = 0; i < Size; ++i) {
+        Ret[i] = ~LhsPtr[i];
+      }
+      return PackedArith<Container>(*reinterpret_cast<Dqword *>(&Ret));
+    }
+
+#define MinMaxOperations(Name, Suffix)                                         \
+  template <typename Container = C, int Size = N>                              \
+  Dqword Name##Suffix(const Dqword &Rhs) const {                               \
+    static_assert(std::is_floating_point<Container>::value,                    \
+                  #Name #Suffix "ps is only available for fp.");               \
+    const Container *const RhsPtr =                                            \
+        reinterpret_cast<const Container *const>(&Rhs);                        \
+    const Container *const LhsPtr =                                            \
+        reinterpret_cast<const Container *const>(&Lhs);                        \
+    Container Ret[Size];                                                       \
+    for (uint32_t i = 0; i < Size; ++i) {                                      \
+      Ret[i] = std::Name(LhsPtr[i], RhsPtr[i]);                                \
+    }                                                                          \
+    return *reinterpret_cast<Dqword *>(&Ret);                                  \
+  }
+
+    MinMaxOperations(max, ps);
+    MinMaxOperations(max, pd);
+    MinMaxOperations(min, ps);
+    MinMaxOperations(min, pd);
+#undef MinMaxOperations
+
+    template <typename Container = C, int Size = N>
+    Dqword blendWith(const Dqword &Rhs, const Dqword &Mask) const {
+      using MaskType = typename std::conditional<
+          sizeof(Container) == 1, int8_t,
+          typename std::conditional<sizeof(Container) == 2, int16_t,
+                                    int32_t>::type>::type;
+      static_assert(sizeof(MaskType) == sizeof(Container),
+                    "MaskType has the wrong size.");
+      const Container *const RhsPtr =
+          reinterpret_cast<const Container *const>(&Rhs);
+      const Container *const LhsPtr =
+          reinterpret_cast<const Container *const>(&Lhs);
+      const MaskType *const MaskPtr =
+          reinterpret_cast<const MaskType *const>(&Mask);
+      Container Ret[Size];
+      for (int i = 0; i < Size; ++i) {
+        Ret[i] = ((MaskPtr[i] < 0) ? RhsPtr : LhsPtr)[i];
+      }
+      return *reinterpret_cast<Dqword *>(&Ret);
+    }
+
+  private:
+    // The AssemblerX8632Test class needs to be a friend so that it can create
+    // PackedArith objects (see below.)
+    friend class AssemblerX8632Test;
+
+    explicit PackedArith(const Dqword &MyLhs) : Lhs(MyLhs) {}
+
+    // Lhs can't be a & because operator~ returns a temporary object that needs
+    // access to its own Dqword.
+    const Dqword Lhs;
+  };
+
+  // Named constructor for PackedArith objects.
+  template <typename C> static PackedArith<C> packedAs(const Dqword &D) {
+    return PackedArith<C>(D);
+  }
+
+  AssemblerX8632Test() { reset(); }
+
+  void reset() {
+    AssemblerX8632TestBase::reset();
+
+    NeedsEpilogue = true;
+    // These dwords are allocated for saving the GPR state after the jitted code
+    // runs.
+    NumAllocatedDwords = AssembledTest::ScratchpadSlots;
+    addPrologue();
+  }
+
+  // AssembledTest is a wrapper around a PROT_EXEC mmap'ed buffer. This buffer
+  // contains both the test code as well as prologue/epilogue, and the
+  // scratchpad area that tests may use -- all tests use this scratchpad area
+  // for storing the processor's registers after the tests executed. This class
+  // also exposes helper methods for reading the register state after test
+  // execution, as well as for reading the scratchpad area.
+  class AssembledTest {
+    AssembledTest() = delete;
+    AssembledTest(const AssembledTest &) = delete;
+    AssembledTest &operator=(const AssembledTest &) = delete;
+
+  public:
+    static constexpr uint32_t MaximumCodeSize = 1 << 20;
+    static constexpr uint32_t EaxSlot = 0;
+    static constexpr uint32_t EbxSlot = 1;
+    static constexpr uint32_t EcxSlot = 2;
+    static constexpr uint32_t EdxSlot = 3;
+    static constexpr uint32_t EdiSlot = 4;
+    static constexpr uint32_t EsiSlot = 5;
+    static constexpr uint32_t EbpSlot = 6;
+    static constexpr uint32_t EspSlot = 7;
+    // save 4 dwords for each xmm registers.
+    static constexpr uint32_t Xmm0Slot = 8;
+    static constexpr uint32_t Xmm1Slot = 12;
+    static constexpr uint32_t Xmm2Slot = 16;
+    static constexpr uint32_t Xmm3Slot = 20;
+    static constexpr uint32_t Xmm4Slot = 24;
+    static constexpr uint32_t Xmm5Slot = 28;
+    static constexpr uint32_t Xmm6Slot = 32;
+    static constexpr uint32_t Xmm7Slot = 36;
+    static constexpr uint32_t ScratchpadSlots = 40;
+
+    AssembledTest(const uint8_t *Data, const size_t MySize,
+                  const size_t ExtraStorageDwords)
+        : Size(MaximumCodeSize + 4 * ExtraStorageDwords) {
+      // MaxCodeSize is needed because EXPECT_LT needs a symbol with a name --
+      // probably a compiler bug?
+      uint32_t MaxCodeSize = MaximumCodeSize;
+      EXPECT_LT(MySize, MaxCodeSize);
+      assert(MySize < MaximumCodeSize);
+      ExecutableData = mmap(nullptr, Size, PROT_WRITE | PROT_READ | PROT_EXEC,
+                            MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+      EXPECT_NE(MAP_FAILED, ExecutableData) << strerror(errno);
+      assert(MAP_FAILED != ExecutableData);
+      std::memcpy(ExecutableData, Data, MySize);
+    }
+
+    // We allow AssembledTest to be moved so that we can return objects of
+    // this type.
+    AssembledTest(AssembledTest &&Buffer)
+        : ExecutableData(Buffer.ExecutableData), Size(Buffer.Size) {
+      Buffer.ExecutableData = nullptr;
+      Buffer.Size = 0;
+    }
+
+    AssembledTest &operator=(AssembledTest &&Buffer) {
+      ExecutableData = Buffer.ExecutableData;
+      Buffer.ExecutableData = nullptr;
+      Size = Buffer.Size;
+      Buffer.Size = 0;
+      return *this;
+    }
+
+    ~AssembledTest() {
+      if (ExecutableData != nullptr) {
+        munmap(ExecutableData, Size);
+        ExecutableData = nullptr;
+      }
+    }
+
+    void run() const { reinterpret_cast<void (*)()>(ExecutableData)(); }
+
+    uint32_t eax() const { return contentsOfDword(AssembledTest::EaxSlot); }
+
+    uint32_t ebx() const { return contentsOfDword(AssembledTest::EbxSlot); }
+
+    uint32_t ecx() const { return contentsOfDword(AssembledTest::EcxSlot); }
+
+    uint32_t edx() const { return contentsOfDword(AssembledTest::EdxSlot); }
+
+    uint32_t edi() const { return contentsOfDword(AssembledTest::EdiSlot); }
+
+    uint32_t esi() const { return contentsOfDword(AssembledTest::EsiSlot); }
+
+    uint32_t ebp() const { return contentsOfDword(AssembledTest::EbpSlot); }
+
+    uint32_t esp() const { return contentsOfDword(AssembledTest::EspSlot); }
+
+    template <typename T> T xmm0() const {
+      return xmm<T>(AssembledTest::Xmm0Slot);
+    }
+
+    template <typename T> T xmm1() const {
+      return xmm<T>(AssembledTest::Xmm1Slot);
+    }
+
+    template <typename T> T xmm2() const {
+      return xmm<T>(AssembledTest::Xmm2Slot);
+    }
+
+    template <typename T> T xmm3() const {
+      return xmm<T>(AssembledTest::Xmm3Slot);
+    }
+
+    template <typename T> T xmm4() const {
+      return xmm<T>(AssembledTest::Xmm4Slot);
+    }
+
+    template <typename T> T xmm5() const {
+      return xmm<T>(AssembledTest::Xmm5Slot);
+    }
+
+    template <typename T> T xmm6() const {
+      return xmm<T>(AssembledTest::Xmm6Slot);
+    }
+
+    template <typename T> T xmm7() const {
+      return xmm<T>(AssembledTest::Xmm7Slot);
+    }
+
+    // contentsOfDword is used for reading the values in the scratchpad area.
+    // Valid arguments are the dword ids returned by
+    // AssemblerX8632Test::allocateDword() -- other inputs are considered
+    // invalid, and are not guaranteed to work if the implementation changes.
+    template <typename T = uint32_t, typename = typename std::enable_if<
+                                         sizeof(T) == sizeof(uint32_t)>::type>
+    T contentsOfDword(uint32_t Dword) const {
+      return *reinterpret_cast<T *>(static_cast<uint8_t *>(ExecutableData) +
+                                    dwordOffset(Dword));
+    }
+
+    template <typename T = uint64_t, typename = typename std::enable_if<
+                                         sizeof(T) == sizeof(uint64_t)>::type>
+    T contentsOfQword(uint32_t InitialDword) const {
+      return *reinterpret_cast<T *>(static_cast<uint8_t *>(ExecutableData) +
+                                    dwordOffset(InitialDword));
+    }
+
+    Dqword contentsOfDqword(uint32_t InitialDword) const {
+      return *reinterpret_cast<Dqword *>(
+                 static_cast<uint8_t *>(ExecutableData) +
+                 dwordOffset(InitialDword));
+    }
+
+    template <typename T = uint32_t, typename = typename std::enable_if<
+                                         sizeof(T) == sizeof(uint32_t)>::type>
+    void setDwordTo(uint32_t Dword, T value) {
+      *reinterpret_cast<uint32_t *>(static_cast<uint8_t *>(ExecutableData) +
+                                    dwordOffset(Dword)) =
+          *reinterpret_cast<uint32_t *>(&value);
+    }
+
+    template <typename T = uint64_t, typename = typename std::enable_if<
+                                         sizeof(T) == sizeof(uint64_t)>::type>
+    void setQwordTo(uint32_t InitialDword, T value) {
+      *reinterpret_cast<uint64_t *>(static_cast<uint8_t *>(ExecutableData) +
+                                    dwordOffset(InitialDword)) =
+          *reinterpret_cast<uint64_t *>(&value);
+    }
+
+    void setDqwordTo(uint32_t InitialDword, const Dqword &qdword) {
+      setQwordTo(InitialDword, qdword.U64[0]);
+      setQwordTo(InitialDword + 2, qdword.U64[1]);
+    }
+
+  private:
+    template <typename T>
+    typename std::enable_if<std::is_same<T, Dqword>::value, Dqword>::type
+    xmm(uint8_t Slot) const {
+      return contentsOfDqword(Slot);
+    }
+
+    template <typename T>
+    typename std::enable_if<!std::is_same<T, Dqword>::value, T>::type
+    xmm(uint8_t Slot) const {
+      constexpr bool TIs64Bit = sizeof(T) == sizeof(uint64_t);
+      using _64BitType = typename std::conditional<TIs64Bit, T, uint64_t>::type;
+      using _32BitType = typename std::conditional<TIs64Bit, uint32_t, T>::type;
+      if (TIs64Bit) {
+        return contentsOfQword<_64BitType>(Slot);
+      }
+      return contentsOfDword<_32BitType>(Slot);
+    }
+
+    static uint32_t dwordOffset(uint32_t Index) {
+      return MaximumCodeSize + (Index * 4);
+    }
+
+    void *ExecutableData = nullptr;
+    size_t Size;
+  };
+
+  // assemble created an AssembledTest with the jitted code. The first time
+  // assemble is executed it will add the epilogue to the jitted code (which is
+  // the reason why this method is not const qualified.
+  AssembledTest assemble() {
+    if (NeedsEpilogue) {
+      addEpilogue();
+    }
+
+    NeedsEpilogue = false;
+    return AssembledTest(codeBytes(), codeBytesSize(), NumAllocatedDwords);
+  }
+
+  // Allocates a new dword slot in the test's scratchpad area.
+  uint32_t allocateDword() { return NumAllocatedDwords++; }
+
+  // Allocates a new qword slot in the test's scratchpad area.
+  uint32_t allocateQword() {
+    uint32_t InitialDword = allocateDword();
+    allocateDword();
+    return InitialDword;
+  }
+
+  // Allocates a new dqword slot in the test's scratchpad area.
+  uint32_t allocateDqword() {
+    uint32_t InitialDword = allocateQword();
+    allocateQword();
+    return InitialDword;
+  }
+
+  Address dwordAddress(uint32_t Dword) {
+    return Address(GPRRegister::Encoded_Reg_ebp, dwordDisp(Dword));
+  }
+
+private:
+  // e??SlotAddress returns an AssemblerX8632::Traits::Address that can be used
+  // by the test cases to encode an address operand for accessing the slot for
+  // the specified register. These are all private for, when jitting the test
+  // code, tests should not tamper with these values. Besides, during the test
+  // execution these slots' contents are undefined and should not be accessed.
+  Address eaxSlotAddress() { return dwordAddress(AssembledTest::EaxSlot); }
+  Address ebxSlotAddress() { return dwordAddress(AssembledTest::EbxSlot); }
+  Address ecxSlotAddress() { return dwordAddress(AssembledTest::EcxSlot); }
+  Address edxSlotAddress() { return dwordAddress(AssembledTest::EdxSlot); }
+  Address ediSlotAddress() { return dwordAddress(AssembledTest::EdiSlot); }
+  Address esiSlotAddress() { return dwordAddress(AssembledTest::EsiSlot); }
+  Address ebpSlotAddress() { return dwordAddress(AssembledTest::EbpSlot); }
+  Address espSlotAddress() { return dwordAddress(AssembledTest::EspSlot); }
+  Address xmm0SlotAddress() { return dwordAddress(AssembledTest::Xmm0Slot); }
+  Address xmm1SlotAddress() { return dwordAddress(AssembledTest::Xmm1Slot); }
+  Address xmm2SlotAddress() { return dwordAddress(AssembledTest::Xmm2Slot); }
+  Address xmm3SlotAddress() { return dwordAddress(AssembledTest::Xmm3Slot); }
+  Address xmm4SlotAddress() { return dwordAddress(AssembledTest::Xmm4Slot); }
+  Address xmm5SlotAddress() { return dwordAddress(AssembledTest::Xmm5Slot); }
+  Address xmm6SlotAddress() { return dwordAddress(AssembledTest::Xmm6Slot); }
+  Address xmm7SlotAddress() { return dwordAddress(AssembledTest::Xmm7Slot); }
+
+  // Returns the displacement that should be used when accessing the specified
+  // Dword in the scratchpad area. It needs to adjust for the initial
+  // instructions that are emitted before the call that materializes the IP
+  // register.
+  uint32_t dwordDisp(uint32_t Dword) const {
+    EXPECT_LT(Dword, NumAllocatedDwords);
+    assert(Dword < NumAllocatedDwords);
+    static constexpr uint8_t PushBytes = 1;
+    static constexpr uint8_t CallImmBytes = 5;
+    return AssembledTest::MaximumCodeSize + (Dword * 4) -
+           (7 * PushBytes + CallImmBytes);
+  }
+
+  void addPrologue() {
+    __ pushl(GPRRegister::Encoded_Reg_eax);
+    __ pushl(GPRRegister::Encoded_Reg_ebx);
+    __ pushl(GPRRegister::Encoded_Reg_ecx);
+    __ pushl(GPRRegister::Encoded_Reg_edx);
+    __ pushl(GPRRegister::Encoded_Reg_edi);
+    __ pushl(GPRRegister::Encoded_Reg_esi);
+    __ pushl(GPRRegister::Encoded_Reg_ebp);
+
+    __ call(Immediate(4));
+    __ popl(GPRRegister::Encoded_Reg_ebp);
+    __ mov(IceType_i32, GPRRegister::Encoded_Reg_eax, Immediate(0x00));
+    __ mov(IceType_i32, GPRRegister::Encoded_Reg_ebx, Immediate(0x00));
+    __ mov(IceType_i32, GPRRegister::Encoded_Reg_ecx, Immediate(0x00));
+    __ mov(IceType_i32, GPRRegister::Encoded_Reg_edx, Immediate(0x00));
+    __ mov(IceType_i32, GPRRegister::Encoded_Reg_edi, Immediate(0x00));
+    __ mov(IceType_i32, GPRRegister::Encoded_Reg_esi, Immediate(0x00));
+  }
+
+  void addEpilogue() {
+    __ mov(IceType_i32, eaxSlotAddress(), GPRRegister::Encoded_Reg_eax);
+    __ mov(IceType_i32, ebxSlotAddress(), GPRRegister::Encoded_Reg_ebx);
+    __ mov(IceType_i32, ecxSlotAddress(), GPRRegister::Encoded_Reg_ecx);
+    __ mov(IceType_i32, edxSlotAddress(), GPRRegister::Encoded_Reg_edx);
+    __ mov(IceType_i32, ediSlotAddress(), GPRRegister::Encoded_Reg_edi);
+    __ mov(IceType_i32, esiSlotAddress(), GPRRegister::Encoded_Reg_esi);
+    __ mov(IceType_i32, ebpSlotAddress(), GPRRegister::Encoded_Reg_ebp);
+    __ mov(IceType_i32, espSlotAddress(), GPRRegister::Encoded_Reg_esp);
+    __ movups(xmm0SlotAddress(), XmmRegister::Encoded_Reg_xmm0);
+    __ movups(xmm1SlotAddress(), XmmRegister::Encoded_Reg_xmm1);
+    __ movups(xmm2SlotAddress(), XmmRegister::Encoded_Reg_xmm2);
+    __ movups(xmm3SlotAddress(), XmmRegister::Encoded_Reg_xmm3);
+    __ movups(xmm4SlotAddress(), XmmRegister::Encoded_Reg_xmm4);
+    __ movups(xmm5SlotAddress(), XmmRegister::Encoded_Reg_xmm5);
+    __ movups(xmm6SlotAddress(), XmmRegister::Encoded_Reg_xmm6);
+    __ movups(xmm7SlotAddress(), XmmRegister::Encoded_Reg_xmm7);
+
+    __ popl(GPRRegister::Encoded_Reg_ebp);
+    __ popl(GPRRegister::Encoded_Reg_esi);
+    __ popl(GPRRegister::Encoded_Reg_edi);
+    __ popl(GPRRegister::Encoded_Reg_edx);
+    __ popl(GPRRegister::Encoded_Reg_ecx);
+    __ popl(GPRRegister::Encoded_Reg_ebx);
+    __ popl(GPRRegister::Encoded_Reg_eax);
+
+    __ ret();
+  }
+
+  bool NeedsEpilogue;
+  uint32_t NumAllocatedDwords;
+};
+
+} // end of namespace Test
+} // end of namespace X8632
+} // end of namespace Ice
+
+#endif // ASSEMBLERX8632_TESTUTIL_H_