Add popcnt support for pnacl

base/cpu.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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
@@ skipping 25 matching lines @@
     stepping_(0),
     ext_model_(0),
     ext_family_(0),
     has_mmx_(false),
     has_sse_(false),
     has_sse2_(false),
     has_sse3_(false),
     has_ssse3_(false),
     has_sse41_(false),
     has_sse42_(false),
+    has_popcnt_(false),
     has_avx_(false),
     has_avx2_(false),
     has_aesni_(false),
     has_non_stop_time_stamp_counter_(false),
     cpu_vendor_("unknown") {
   Initialize();
 }
 
 namespace {
 
@@ skipping 114 matching lines @@
     type_ = (cpu_info[0] >> 12) & 0x3;
     ext_model_ = (cpu_info[0] >> 16) & 0xf;
     ext_family_ = (cpu_info[0] >> 20) & 0xff;
     has_mmx_ =   (cpu_info[3] & 0x00800000) != 0;
     has_sse_ =   (cpu_info[3] & 0x02000000) != 0;
     has_sse2_ =  (cpu_info[3] & 0x04000000) != 0;
     has_sse3_ =  (cpu_info[2] & 0x00000001) != 0;
     has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
     has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
     has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
+    has_popcnt_ = (cpu_info[2] & 0x00800000) != 0;
+
     // AVX instructions will generate an illegal instruction exception unless
     //   a) they are supported by the CPU,
     //   b) XSAVE is supported by the CPU and
     //   c) XSAVE is enabled by the kernel.
     // See http://software.intel.com/en-us/blogs/2011/04/14/is-avx-enabled
     //
     // In addition, we have observed some crashes with the xgetbv instruction
     // even after following Intel's example code. (See crbug.com/375968.)
     // Because of that, we also test the XSAVE bit because its description in
     // the CPUID documentation suggests that it signals xgetbv support.
@@ skipping 39 matching lines @@
   if (has_sse42()) return SSE42;
   if (has_sse41()) return SSE41;
   if (has_ssse3()) return SSSE3;
   if (has_sse3()) return SSE3;
   if (has_sse2()) return SSE2;
   if (has_sse()) return SSE;
   return PENTIUM;
 }
 
 }  // namespace base