third_party/libwebp/dsp/cpu.c

   1 // Copyright 2011 Google Inc. All Rights Reserved.
   2 //
   3 // Use of this source code is governed by a BSD-style license
   4 // that can be found in the COPYING file in the root of the source
   5 // tree. An additional intellectual property rights grant can be found
   6 // in the file PATENTS. All contributing project authors may
   7 // be found in the AUTHORS file in the root of the source tree.
   8 // -----------------------------------------------------------------------------
   9 //
  10 // CPU detection
  11 //
  12 // Author: Christian Duvivier (cduvivier@google.com)
  13
  14 #include "./dsp.h"
  15
  16 #if defined(__ANDROID__)
  17 #include <cpu-features.h>
  18 #endif
  19
  20 //------------------------------------------------------------------------------
  21 // SSE2 detection.
  22 //
  23
  24 // apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
  25 #if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
  26 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
  27   __asm__ volatile (
  28     "mov %%ebx, %%edi\n"
  29     "cpuid\n"
  30     "xchg %%edi, %%ebx\n"
  31     : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
  32     : "a"(info_type));
  33 }
  34 #elif defined(__i386__) || defined(__x86_64__)
  35 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
  36   __asm__ volatile (
  37     "cpuid\n"
  38     : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
  39     : "a"(info_type));
  40 }
  41 #elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 150030729  // >= VS2008 SP1
  42 #define GetCPUInfo(info, type) __cpuidex(info, type, 0)  // set ecx=0
  43 #elif defined(WEBP_MSC_SSE2)
  44 #define GetCPUInfo __cpuid
  45 #endif
  46
  47 // NaCl has no support for xgetbv or the raw opcode.
  48 #if !defined(__native_client__) && (defined(__i386__) || defined(__x86_64__))
  49 static WEBP_INLINE uint64_t xgetbv(void) {
  50   const uint32_t ecx = 0;
  51   uint32_t eax, edx;
  52   // Use the raw opcode for xgetbv for compatibility with older toolchains.
  53   __asm__ volatile (
  54     ".byte 0x0f, 0x01, 0xd0\n"
  55     : "=a"(eax), "=d"(edx) : "c" (ecx));
  56   return ((uint64_t)edx << 32) | eax;
  57 }
  58 #elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 160040219  // >= VS2010 SP1
  59 #define xgetbv() _xgetbv(0)
  60 #elif defined(_MSC_VER) && defined(_M_IX86)
  61 static WEBP_INLINE uint64_t xgetbv(void) {
  62   uint32_t eax_, edx_;
  63   __asm {
  64     xor ecx, ecx  // ecx = 0
  65     // Use the raw opcode for xgetbv for compatibility with older toolchains.
  66     __asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0
  67     mov eax_, eax
  68     mov edx_, edx
  69   }
  70   return ((uint64_t)edx_ << 32) | eax_;
  71 }
  72 #else
  73 #define xgetbv() 0U  // no AVX for older x64 or unrecognized toolchains.
  74 #endif
  75
  76 #if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
  77 static int x86CPUInfo(CPUFeature feature) {
  78   int cpu_info[4];
  79   GetCPUInfo(cpu_info, 1);
  80   if (feature == kSSE2) {
  81     return 0 != (cpu_info[3] & 0x04000000);
  82   }
  83   if (feature == kSSE3) {
  84     return 0 != (cpu_info[2] & 0x00000001);
  85   }
  86   if (feature == kAVX) {
  87     // bits 27 (OSXSAVE) & 28 (256-bit AVX)
  88     if ((cpu_info[2] & 0x18000000) == 0x18000000) {
  89       // XMM state and YMM state enabled by the OS.
  90       return (xgetbv() & 0x6) == 0x6;
  91     }
  92   }
  93   if (feature == kAVX2) {
  94     if (x86CPUInfo(kAVX)) {
  95       GetCPUInfo(cpu_info, 7);
  96       return ((cpu_info[1] & 0x00000020) == 0x00000020);
  97     }
  98   }
  99   return 0;
 100 }
 101 VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
 102 #elif defined(WEBP_ANDROID_NEON)  // NB: needs to be before generic NEON test.
 103 static int AndroidCPUInfo(CPUFeature feature) {
 104   const AndroidCpuFamily cpu_family = android_getCpuFamily();
 105   const uint64_t cpu_features = android_getCpuFeatures();
 106   if (feature == kNEON) {
 107     return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
 108             0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
 109   }
 110   return 0;
 111 }
 112 VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
 113 #elif defined(WEBP_USE_NEON)
 114 // define a dummy function to enable turning off NEON at runtime by setting
 115 // VP8DecGetCPUInfo = NULL
 116 static int armCPUInfo(CPUFeature feature) {
 117   (void)feature;
 118   return 1;
 119 }
 120 VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
 121 #elif defined(WEBP_USE_MIPS32)
 122 static int mipsCPUInfo(CPUFeature feature) {
 123   (void)feature;
 124   return 1;
 125 }
 126 VP8CPUInfo VP8GetCPUInfo = mipsCPUInfo;
 127 #else
 128 VP8CPUInfo VP8GetCPUInfo = NULL;
 129 #endif
 130