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(WEBP_MSC_SSE2)
  42 #define GetCPUInfo __cpuid
  43 #endif
  44
  45 #if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
  46 static int x86CPUInfo(CPUFeature feature) {
  47   int cpu_info[4];
  48   GetCPUInfo(cpu_info, 1);
  49   if (feature == kSSE2) {
  50     return 0 != (cpu_info[3] & 0x04000000);
  51   }
  52   if (feature == kSSE3) {
  53     return 0 != (cpu_info[2] & 0x00000001);
  54   }
  55   return 0;
  56 }
  57 VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
  58 #elif defined(WEBP_ANDROID_NEON)
  59 static int AndroidCPUInfo(CPUFeature feature) {
  60   const AndroidCpuFamily cpu_family = android_getCpuFamily();
  61   const uint64_t cpu_features = android_getCpuFeatures();
  62   if (feature == kNEON) {
  63     return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
  64             0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
  65   }
  66   return 0;
  67 }
  68 VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
  69 #elif defined(__ARM_NEON__)
  70 // define a dummy function to enable turning off NEON at runtime by setting
  71 // VP8DecGetCPUInfo = NULL
  72 static int armCPUInfo(CPUFeature feature) {
  73   (void)feature;
  74   return 1;
  75 }
  76 VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
  77 #else
  78 VP8CPUInfo VP8GetCPUInfo = NULL;
  79 #endif
  80