tools/source/misc/cpuid.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <tools/cpuid.hxx>
  12 #include <cstdint>
  13
  14 namespace cpuid {
  15
  16 namespace {
  17
  18 #if defined(_MSC_VER)
  19 #include <intrin.h>
  20 void getCpuId(uint32_t array[4], uint32_t nInfoType)
  21 {
  22     __cpuid(reinterpret_cast<int*>(array), nInfoType);
  23 }
  24 #elif (defined(__i386__) || defined(__x86_64__))
  25 #include <cpuid.h>
  26 void getCpuId(uint32_t array[4], uint32_t nInfoType)
  27 {
  28     __cpuid_count(nInfoType, 0, *(array + 0), *(array + 1), *(array + 2), *(array + 3));
  29 }
  30 #else
  31 void getCpuId(uint32_t array[4], uint32_t /*nInfoType*/)
  32 {
  33    array[0] = array[1] =  array[2] = array[3] = 0;
  34 }
  35 #endif
  36
  37 // For AVX we need to check if OS has support for ymm registers
  38 bool checkAVXSupportInOS()
  39 {
  40     uint32_t xcr0 = 0;
  41 #if defined(_MSC_VER)
  42     xcr0 = uint32_t(_xgetbv(0));
  43 #elif (defined(__i386__) || defined(__x86_64__))
  44     __asm__("xgetbv" : "=a" (xcr0) : "c" (0) : "%edx");
  45 #endif
  46     return ((xcr0 & 6) == 6); /* checking if xmm and ymm state are enabled in XCR0 */
  47 }
  48
  49 } // end anonymous namespace
  50
  51 #define HYPER_bit (1 << 28)
  52 #define SSE2_bit  (1 << 26)
  53 #define SSSE3_bit (1 <<  9)
  54 #define SSE41_bit (1 << 19)
  55 #define SSE42_bit (1 << 20)
  56 #define XSAVE_bit (1 << 27)
  57 #define AVX_bit   (1 << 28)
  58 #define AVX2_bit  (1 << 5)
  59
  60 InstructionSetFlags getCpuInstructionSetFlags()
  61 {
  62     InstructionSetFlags eInstructions = InstructionSetFlags::NONE;
  63
  64     uint32_t info[] = {0, 0, 0, 0};
  65     getCpuId(info, 0);
  66     int nLevel = info[0];
  67
  68     if (nLevel >= 1)
  69     {
  70         uint32_t aCpuInfoArray[] = {0, 0, 0, 0};
  71         getCpuId(aCpuInfoArray, 1);
  72
  73         if ((aCpuInfoArray[3] & HYPER_bit) != 0)
  74             eInstructions |= InstructionSetFlags::HYPER;
  75
  76         if ((aCpuInfoArray[3] & SSE2_bit) != 0)
  77             eInstructions |= InstructionSetFlags::SSE2;
  78
  79         if ((aCpuInfoArray[2] & SSSE3_bit) != 0)
  80             eInstructions |= InstructionSetFlags::SSSE3;
  81
  82         if ((aCpuInfoArray[2] & SSE41_bit ) != 0)
  83             eInstructions |= InstructionSetFlags::SSE41;
  84
  85         if ((aCpuInfoArray[2] & SSE42_bit) != 0)
  86             eInstructions |= InstructionSetFlags::SSE42;
  87
  88         if (((aCpuInfoArray[2] & AVX_bit)   != 0) &&
  89             ((aCpuInfoArray[2] & XSAVE_bit) != 0))
  90         {
  91             if (checkAVXSupportInOS())
  92             {
  93                 eInstructions |= InstructionSetFlags::AVX;
  94
  95                 if (nLevel >= 7)
  96                 {
  97                     uint32_t aExtendedInfo[] = {0, 0, 0, 0};
  98                     getCpuId(aExtendedInfo, 7);
  99
 100                     if ((aExtendedInfo[1] & AVX2_bit) != 0)
 101                         eInstructions |= InstructionSetFlags::AVX2;
 102                 }
 103             }
 104         }
 105     }
 106
 107     return eInstructions;
 108 }
 109
 110 bool isCpuInstructionSetSupported(InstructionSetFlags eInstructions)
 111 {
 112     static InstructionSetFlags eCPUFlags = getCpuInstructionSetFlags();
 113     return (eCPUFlags & eInstructions) == eInstructions;
 114 }
 115
 116 OUString instructionSetSupportedString()
 117 {
 118     OUString aString;
 119     if (isCpuInstructionSetSupported(InstructionSetFlags::SSE2))
 120         aString += "SSE2 ";
 121     if (isCpuInstructionSetSupported(InstructionSetFlags::SSSE3))
 122         aString += "SSSE3 ";
 123     if (isCpuInstructionSetSupported(InstructionSetFlags::SSE41))
 124         aString += "SSE4.1 ";
 125     if (isCpuInstructionSetSupported(InstructionSetFlags::SSE42))
 126         aString += "SSE4.2 ";
 127     if (isCpuInstructionSetSupported(InstructionSetFlags::AVX))
 128         aString += "AVX ";
 129     if (isCpuInstructionSetSupported(InstructionSetFlags::AVX2))
 130         aString += "AVX2 ";
 131     return aString;
 132 }
 133
 134 } // end cpuid
 135
 136 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */