base/cpu_unittest.cc

// Copyright (c) 2012 The Chromium 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 "base/cpu.h"
#include "base/stl_util.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"

// Tests whether we can run extended instructions represented by the CPU
// information. This test actually executes some extended instructions (such as
// MMX, SSE, etc.) supported by the CPU and sees we can run them without
// "undefined instruction" exceptions. That is, this test succeeds when this
// test finishes without a crash.
TEST(CPU, RunExtendedInstructions) {
#if defined(ARCH_CPU_X86_FAMILY)
  // Retrieve the CPU information.
  base::CPU cpu;

  ASSERT_TRUE(cpu.has_mmx());
  ASSERT_TRUE(cpu.has_sse());
  ASSERT_TRUE(cpu.has_sse2());

// GCC and clang instruction test.
#if defined(COMPILER_GCC)
  // Execute an MMX instruction.
  __asm__ __volatile__("emms\n" : : : "mm0");

  // Execute an SSE instruction.
  __asm__ __volatile__("xorps %%xmm0, %%xmm0\n" : : : "xmm0");

  // Execute an SSE 2 instruction.
  __asm__ __volatile__("psrldq $0, %%xmm0\n" : : : "xmm0");

  if (cpu.has_sse3()) {
    // Execute an SSE 3 instruction.
    __asm__ __volatile__("addsubpd %%xmm0, %%xmm0\n" : : : "xmm0");
  }

  if (cpu.has_ssse3()) {
    // Execute a Supplimental SSE 3 instruction.
    __asm__ __volatile__("psignb %%xmm0, %%xmm0\n" : : : "xmm0");
  }

  if (cpu.has_sse41()) {
    // Execute an SSE 4.1 instruction.
    __asm__ __volatile__("pmuldq %%xmm0, %%xmm0\n" : : : "xmm0");
  }

  if (cpu.has_sse42()) {
    // Execute an SSE 4.2 instruction.
    __asm__ __volatile__("crc32 %%eax, %%eax\n" : : : "eax");
  }

  if (cpu.has_popcnt()) {
    // Execute a POPCNT instruction.
    __asm__ __volatile__("popcnt %%eax, %%eax\n" : : : "eax");
  }

  if (cpu.has_avx()) {
    // Execute an AVX instruction.
    __asm__ __volatile__("vzeroupper\n" : : : "xmm0");
  }

  if (cpu.has_avx2()) {
    // Execute an AVX 2 instruction.
    __asm__ __volatile__("vpunpcklbw %%ymm0, %%ymm0, %%ymm0\n" : : : "xmm0");
  }

// Visual C 32 bit and ClangCL 32/64 bit test.
#elif defined(COMPILER_MSVC) && (defined(ARCH_CPU_32_BITS) || \
      (defined(ARCH_CPU_64_BITS) && defined(__clang__)))

  // Execute an MMX instruction.
  __asm emms;

  // Execute an SSE instruction.
  __asm xorps xmm0, xmm0;

  // Execute an SSE 2 instruction.
  __asm psrldq xmm0, 0;

  if (cpu.has_sse3()) {
    // Execute an SSE 3 instruction.
    __asm addsubpd xmm0, xmm0;
  }

  if (cpu.has_ssse3()) {
    // Execute a Supplimental SSE 3 instruction.
    __asm psignb xmm0, xmm0;
  }

  if (cpu.has_sse41()) {
    // Execute an SSE 4.1 instruction.
    __asm pmuldq xmm0, xmm0;
  }

  if (cpu.has_sse42()) {
    // Execute an SSE 4.2 instruction.
    __asm crc32 eax, eax;
  }

  if (cpu.has_popcnt()) {
    // Execute a POPCNT instruction.
    __asm popcnt eax, eax;
  }

  if (cpu.has_avx()) {
    // Execute an AVX instruction.
    __asm vzeroupper;
  }

  if (cpu.has_avx2()) {
    // Execute an AVX 2 instruction.
    __asm vpunpcklbw ymm0, ymm0, ymm0
  }
#endif  // defined(COMPILER_GCC)
#endif  // defined(ARCH_CPU_X86_FAMILY)
}

// For https://crbug.com/249713
TEST(CPU, BrandAndVendorContainsNoNUL) {
  base::CPU cpu;
  EXPECT_FALSE(base::Contains(cpu.cpu_brand(), '\0'));
  EXPECT_FALSE(base::Contains(cpu.vendor_name(), '\0'));
}

#if defined(ARCH_CPU_X86_FAMILY)
// Tests that we compute the correct CPU family and model based on the vendor
// and CPUID signature.
TEST(CPU, X86FamilyAndModel) {
  int family;
  int model;
  int ext_family;
  int ext_model;

  // Check with an Intel Skylake signature.
  std::tie(family, model, ext_family, ext_model) =
      base::internal::ComputeX86FamilyAndModel("GenuineIntel", 0x000406e3);
  EXPECT_EQ(family, 6);
  EXPECT_EQ(model, 78);
  EXPECT_EQ(ext_family, 0);
  EXPECT_EQ(ext_model, 4);

  // Check with an Intel Airmont signature.
  std::tie(family, model, ext_family, ext_model) =
      base::internal::ComputeX86FamilyAndModel("GenuineIntel", 0x000406c2);
  EXPECT_EQ(family, 6);
  EXPECT_EQ(model, 76);
  EXPECT_EQ(ext_family, 0);
  EXPECT_EQ(ext_model, 4);

  // Check with an Intel Prescott signature.
  std::tie(family, model, ext_family, ext_model) =
      base::internal::ComputeX86FamilyAndModel("GenuineIntel", 0x00000f31);
  EXPECT_EQ(family, 15);
  EXPECT_EQ(model, 3);
  EXPECT_EQ(ext_family, 0);
  EXPECT_EQ(ext_model, 0);

  // Check with an AMD Excavator signature.
  std::tie(family, model, ext_family, ext_model) =
      base::internal::ComputeX86FamilyAndModel("AuthenticAMD", 0x00670f00);
  EXPECT_EQ(family, 21);
  EXPECT_EQ(model, 112);
  EXPECT_EQ(ext_family, 6);
  EXPECT_EQ(ext_model, 7);
}
#endif  // defined(ARCH_CPU_X86_FAMILY)