test/cctest/test-assembler-arm.cc

// Copyright 2010 the V8 project authors. All rights reserved.
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#include "v8.h"

#include "disassembler.h"
#include "factory.h"
#include "arm/simulator-arm.h"
#include "arm/assembler-arm-inl.h"
#include "cctest.h"

using namespace v8::internal;


// Define these function prototypes to match JSEntryFunction in execution.cc.
typedef Object* (*F1)(int x, int p1, int p2, int p3, int p4);
typedef Object* (*F2)(int x, int y, int p2, int p3, int p4);
typedef Object* (*F3)(void* p, int p1, int p2, int p3, int p4);


static v8::Persistent<v8::Context> env;


// The test framework does not accept flags on the command line, so we set them
static void InitializeVM() {
  // enable generation of comments
  FLAG_debug_code = true;

  if (env.IsEmpty()) {
    env = v8::Context::New();
  }
}


#define __ assm.

TEST(0) {
  InitializeVM();
  v8::HandleScope scope;

  Assembler assm(NULL, 0);

  __ add(r0, r0, Operand(r1));
  __ mov(pc, Operand(lr));

  CodeDesc desc;
  assm.GetCode(&desc);
  Object* code = Heap::CreateCode(
      desc,
      Code::ComputeFlags(Code::STUB),
      Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
  CHECK(code->IsCode());
#ifdef DEBUG
  Code::cast(code)->Print();
#endif
  F2 f = FUNCTION_CAST<F2>(Code::cast(code)->entry());
  int res = reinterpret_cast<int>(CALL_GENERATED_CODE(f, 3, 4, 0, 0, 0));
  ::printf("f() = %d\n", res);
  CHECK_EQ(7, res);
}


TEST(1) {
  InitializeVM();
  v8::HandleScope scope;

  Assembler assm(NULL, 0);
  Label L, C;

  __ mov(r1, Operand(r0));
  __ mov(r0, Operand(0, RelocInfo::NONE));
  __ b(&C);

  __ bind(&L);
  __ add(r0, r0, Operand(r1));
  __ sub(r1, r1, Operand(1));

  __ bind(&C);
  __ teq(r1, Operand(0, RelocInfo::NONE));
  __ b(ne, &L);
  __ mov(pc, Operand(lr));

  CodeDesc desc;
  assm.GetCode(&desc);
  Object* code = Heap::CreateCode(
      desc,
      Code::ComputeFlags(Code::STUB),
      Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
  CHECK(code->IsCode());
#ifdef DEBUG
  Code::cast(code)->Print();
#endif
  F1 f = FUNCTION_CAST<F1>(Code::cast(code)->entry());
  int res = reinterpret_cast<int>(CALL_GENERATED_CODE(f, 100, 0, 0, 0, 0));
  ::printf("f() = %d\n", res);
  CHECK_EQ(5050, res);
}


TEST(2) {
  InitializeVM();
  v8::HandleScope scope;

  Assembler assm(NULL, 0);
  Label L, C;

  __ mov(r1, Operand(r0));
  __ mov(r0, Operand(1));
  __ b(&C);

  __ bind(&L);
  __ mul(r0, r1, r0);
  __ sub(r1, r1, Operand(1));

  __ bind(&C);
  __ teq(r1, Operand(0, RelocInfo::NONE));
  __ b(ne, &L);
  __ mov(pc, Operand(lr));

  // some relocated stuff here, not executed
  __ RecordComment("dead code, just testing relocations");
  __ mov(r0, Operand(Factory::true_value()));
  __ RecordComment("dead code, just testing immediate operands");
  __ mov(r0, Operand(-1));
  __ mov(r0, Operand(0xFF000000));
  __ mov(r0, Operand(0xF0F0F0F0));
  __ mov(r0, Operand(0xFFF0FFFF));

  CodeDesc desc;
  assm.GetCode(&desc);
  Object* code = Heap::CreateCode(
      desc,
      Code::ComputeFlags(Code::STUB),
      Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
  CHECK(code->IsCode());
#ifdef DEBUG
  Code::cast(code)->Print();
#endif
  F1 f = FUNCTION_CAST<F1>(Code::cast(code)->entry());
  int res = reinterpret_cast<int>(CALL_GENERATED_CODE(f, 10, 0, 0, 0, 0));
  ::printf("f() = %d\n", res);
  CHECK_EQ(3628800, res);
}


TEST(3) {
  InitializeVM();
  v8::HandleScope scope;

  typedef struct {
    int i;
    char c;
    int16_t s;
  } T;
  T t;

  Assembler assm(NULL, 0);
  Label L, C;

  __ mov(ip, Operand(sp));
  __ stm(db_w, sp, r4.bit() | fp.bit() | lr.bit());
  __ sub(fp, ip, Operand(4));
  __ mov(r4, Operand(r0));
  __ ldr(r0, MemOperand(r4, OFFSET_OF(T, i)));
  __ mov(r2, Operand(r0, ASR, 1));
  __ str(r2, MemOperand(r4, OFFSET_OF(T, i)));
  __ ldrsb(r2, MemOperand(r4, OFFSET_OF(T, c)));
  __ add(r0, r2, Operand(r0));
  __ mov(r2, Operand(r2, LSL, 2));
  __ strb(r2, MemOperand(r4, OFFSET_OF(T, c)));
  __ ldrsh(r2, MemOperand(r4, OFFSET_OF(T, s)));
  __ add(r0, r2, Operand(r0));
  __ mov(r2, Operand(r2, ASR, 3));
  __ strh(r2, MemOperand(r4, OFFSET_OF(T, s)));
  __ ldm(ia_w, sp, r4.bit() | fp.bit() | pc.bit());

  CodeDesc desc;
  assm.GetCode(&desc);
  Object* code = Heap::CreateCode(
      desc,
      Code::ComputeFlags(Code::STUB),
      Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
  CHECK(code->IsCode());
#ifdef DEBUG
  Code::cast(code)->Print();
#endif
  F3 f = FUNCTION_CAST<F3>(Code::cast(code)->entry());
  t.i = 100000;
  t.c = 10;
  t.s = 1000;
  int res = reinterpret_cast<int>(CALL_GENERATED_CODE(f, &t, 0, 0, 0, 0));
  ::printf("f() = %d\n", res);
  CHECK_EQ(101010, res);
  CHECK_EQ(100000/2, t.i);
  CHECK_EQ(10*4, t.c);
  CHECK_EQ(1000/8, t.s);
}


TEST(4) {
  // Test the VFP floating point instructions.
  InitializeVM();
  v8::HandleScope scope;

  typedef struct {
    double a;
    double b;
    double c;
    double d;
    double e;
    double f;
    int i;
    float x;
    float y;
  } T;
  T t;

  // Create a function that accepts &t, and loads, manipulates, and stores
  // the doubles and floats.
  Assembler assm(NULL, 0);
  Label L, C;


  if (CpuFeatures::IsSupported(VFP3)) {
    CpuFeatures::Scope scope(VFP3);

    __ mov(ip, Operand(sp));
    __ stm(db_w, sp, r4.bit() | fp.bit() | lr.bit());
    __ sub(fp, ip, Operand(4));

    __ mov(r4, Operand(r0));
    __ vldr(d6, r4, OFFSET_OF(T, a));
    __ vldr(d7, r4, OFFSET_OF(T, b));
    __ vadd(d5, d6, d7);
    __ vstr(d5, r4, OFFSET_OF(T, c));

    __ vmov(r2, r3, d5);
    __ vmov(d4, r2, r3);
    __ vstr(d4, r4, OFFSET_OF(T, b));

    // Load t.x and t.y, switch values, and store back to the struct.
    __ vldr(s0, r4, OFFSET_OF(T, x));
    __ vldr(s31, r4, OFFSET_OF(T, y));
    __ vmov(s16, s0);
    __ vmov(s0, s31);
    __ vmov(s31, s16);
    __ vstr(s0, r4, OFFSET_OF(T, x));
    __ vstr(s31, r4, OFFSET_OF(T, y));

    // Move a literal into a register that can be encoded in the instruction.
    __ vmov(d4, 1.0);
    __ vstr(d4, r4, OFFSET_OF(T, e));

    // Move a literal into a register that requires 64 bits to encode.
    // 0x3ff0000010000000 = 1.000000059604644775390625
    __ vmov(d4, 1.000000059604644775390625);
    __ vstr(d4, r4, OFFSET_OF(T, d));

    // Convert from floating point to integer.
    __ vmov(d4, 2.0);
    __ vcvt_s32_f64(s31, d4);
    __ vstr(s31, r4, OFFSET_OF(T, i));

    // Convert from integer to floating point.
    __ mov(lr, Operand(42));
    __ vmov(s31, lr);
    __ vcvt_f64_s32(d4, s31);
    __ vstr(d4, r4, OFFSET_OF(T, f));
    __ ldm(ia_w, sp, r4.bit() | fp.bit() | pc.bit());

    CodeDesc desc;
    assm.GetCode(&desc);
    Object* code = Heap::CreateCode(
        desc,
        Code::ComputeFlags(Code::STUB),
        Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
    CHECK(code->IsCode());
#ifdef DEBUG
    Code::cast(code)->Print();
#endif
    F3 f = FUNCTION_CAST<F3>(Code::cast(code)->entry());
    t.a = 1.5;
    t.b = 2.75;
    t.c = 17.17;
    t.d = 0.0;
    t.e = 0.0;
    t.f = 0.0;
    t.i = 0;
    t.x = 4.5;
    t.y = 9.0;
    Object* dummy = CALL_GENERATED_CODE(f, &t, 0, 0, 0, 0);
    USE(dummy);
    CHECK_EQ(4.5, t.y);
    CHECK_EQ(9.0, t.x);
    CHECK_EQ(2, t.i);
    CHECK_EQ(42.0, t.f);
    CHECK_EQ(1.0, t.e);
    CHECK_EQ(1.000000059604644775390625, t.d);
    CHECK_EQ(4.25, t.c);
    CHECK_EQ(4.25, t.b);
    CHECK_EQ(1.5, t.a);
  }
}


TEST(5) {
  // Test the ARMv7 bitfield instructions.
  InitializeVM();
  v8::HandleScope scope;

  Assembler assm(NULL, 0);

  if (CpuFeatures::IsSupported(ARMv7)) {
    CpuFeatures::Scope scope(ARMv7);
    // On entry, r0 = 0xAAAAAAAA = 0b10..10101010.
    __ ubfx(r0, r0, 1, 12);  // 0b00..010101010101 = 0x555
    __ sbfx(r0, r0, 0, 5);   // 0b11..111111110101 = -11
    __ bfc(r0, 1, 3);        // 0b11..111111110001 = -15
    __ mov(r1, Operand(7));
    __ bfi(r0, r1, 3, 3);    // 0b11..111111111001 = -7
    __ mov(pc, Operand(lr));

    CodeDesc desc;
    assm.GetCode(&desc);
    Object* code = Heap::CreateCode(
        desc,
        Code::ComputeFlags(Code::STUB),
        Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
    CHECK(code->IsCode());
#ifdef DEBUG
    Code::cast(code)->Print();
#endif
    F1 f = FUNCTION_CAST<F1>(Code::cast(code)->entry());
    int res = reinterpret_cast<int>(
                CALL_GENERATED_CODE(f, 0xAAAAAAAA, 0, 0, 0, 0));
    ::printf("f() = %d\n", res);
    CHECK_EQ(-7, res);
  }
}


TEST(6) {
  // Test saturating instructions.
  InitializeVM();
  v8::HandleScope scope;

  Assembler assm(NULL, 0);

  if (CpuFeatures::IsSupported(ARMv7)) {
    CpuFeatures::Scope scope(ARMv7);
    __ usat(r1, 8, Operand(r0));           // Sat 0xFFFF to 0-255 = 0xFF.
    __ usat(r2, 12, Operand(r0, ASR, 9));  // Sat (0xFFFF>>9) to 0-4095 = 0x7F.
    __ usat(r3, 1, Operand(r0, LSL, 16));  // Sat (0xFFFF<<16) to 0-1 = 0x0.
    __ add(r0, r1, Operand(r2));
    __ add(r0, r0, Operand(r3));
    __ mov(pc, Operand(lr));

    CodeDesc desc;
    assm.GetCode(&desc);
    Object* code = Heap::CreateCode(
        desc,
        Code::ComputeFlags(Code::STUB),
        Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
    CHECK(code->IsCode());
#ifdef DEBUG
    Code::cast(code)->Print();
#endif
    F1 f = FUNCTION_CAST<F1>(Code::cast(code)->entry());
    int res = reinterpret_cast<int>(
                CALL_GENERATED_CODE(f, 0xFFFF, 0, 0, 0, 0));
    ::printf("f() = %d\n", res);
    CHECK_EQ(382, res);
  }
}


static void TestRoundingMode(int32_t mode, double value, int expected) {
  InitializeVM();
  v8::HandleScope scope;

  Assembler assm(NULL, 0);

  __ vmrs(r1);
  // Set custom FPSCR.
  __ bic(r2, r1, Operand(((mode ^ 3) << 22) | 0xf));
  __ orr(r2, r2, Operand(mode << 22));
  __ vmsr(r2);

  // Load value, convert, and move back result to r0.
  __ vmov(d1, value);
  __ vcvt_s32_f64(s0, d1, Assembler::FPSCRRounding, al);
  __ vmov(r0, s0);

  __ mov(pc, Operand(lr));

  CodeDesc desc;
  assm.GetCode(&desc);
  Object* code = Heap::CreateCode(
      desc,
      Code::ComputeFlags(Code::STUB),
      Handle<Object>(Heap::undefined_value()))->ToObjectChecked();
  CHECK(code->IsCode());
#ifdef DEBUG
  Code::cast(code)->Print();
#endif
  F1 f = FUNCTION_CAST<F1>(Code::cast(code)->entry());
  int res = reinterpret_cast<int>(
              CALL_GENERATED_CODE(f, 0, 0, 0, 0, 0));
  ::printf("res = %d\n", res);
  CHECK_EQ(expected, res);
}


TEST(7) {
  // Test vfp rounding modes.

  // See ARM DDI 0406B Page A2-29.
  enum FPSCRRoungingMode {
    RN,   // Round to Nearest.
    RP,   // Round towards Plus Infinity.
    RM,   // Round towards Minus Infinity.
    RZ    // Round towards zero.
  };

  if (CpuFeatures::IsSupported(VFP3)) {
    CpuFeatures::Scope scope(VFP3);

    TestRoundingMode(RZ,  0.5, 0);
    TestRoundingMode(RZ, -0.5, 0);
    TestRoundingMode(RZ,  123.7,  123);
    TestRoundingMode(RZ, -123.7, -123);
    TestRoundingMode(RZ,  123456.2,  123456);
    TestRoundingMode(RZ, -123456.2, -123456);

    TestRoundingMode(RM,  0.5, 0);
    TestRoundingMode(RM, -0.5, -1);
    TestRoundingMode(RM,  123.7, 123);
    TestRoundingMode(RM, -123.7, -124);
    TestRoundingMode(RM,  123456.2,  123456);
    TestRoundingMode(RM, -123456.2, -123457);
  }
}

#undef __