Add popcnt support for pnacl

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 "build/build_config.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if _MSC_VER >= 1700
 // C4752: found Intel(R) Advanced Vector Extensions; consider using /arch:AVX.
 #pragma warning(disable: 4752)
 #endif
 
 // 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)

[Mark Mentovai, 2016/10/30 15:37:55]

Test popcnt up here in the gcc/clang branch.

   // 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()) {
@@ skipping 52 matching lines @@
   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;
+  }
+
 // Visual C 2012 required for AVX.
 #if _MSC_VER >= 1700
   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  // _MSC_VER >= 1700
 #endif  // defined(COMPILER_GCC)
 #endif  // defined(ARCH_CPU_X86_FAMILY)
 }