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      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 (at) google.com)
     13 
     14 #include "./dsp.h"
     15 
     16 #if defined(__ANDROID__)
     17 #include "./cpu-features.h"
     18 #endif
     19 
     20 #if defined(__cplusplus) || defined(c_plusplus)
     21 extern "C" {
     22 #endif
     23 
     24 //------------------------------------------------------------------------------
     25 // SSE2 detection.
     26 //
     27 
     28 // apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
     29 #if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
     30 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
     31   __asm__ volatile (
     32     "mov %%ebx, %%edi\n"
     33     "cpuid\n"
     34     "xchg %%edi, %%ebx\n"
     35     : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
     36     : "a"(info_type));
     37 }
     38 #elif defined(__i386__) || defined(__x86_64__)
     39 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
     40   __asm__ volatile (
     41     "cpuid\n"
     42     : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
     43     : "a"(info_type));
     44 }
     45 #elif defined(WEBP_MSC_SSE2)
     46 #define GetCPUInfo __cpuid
     47 #endif
     48 
     49 #if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
     50 static int x86CPUInfo(CPUFeature feature) {
     51   int cpu_info[4];
     52   GetCPUInfo(cpu_info, 1);
     53   if (feature == kSSE2) {
     54     return 0 != (cpu_info[3] & 0x04000000);
     55   }
     56   if (feature == kSSE3) {
     57     return 0 != (cpu_info[2] & 0x00000001);
     58   }
     59   return 0;
     60 }
     61 VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
     62 #elif defined(WEBP_ANDROID_NEON)
     63 static int AndroidCPUInfo(CPUFeature feature) {
     64   const AndroidCpuFamily cpu_family = android_getCpuFamily();
     65   const uint64_t cpu_features = android_getCpuFeatures();
     66   if (feature == kNEON) {
     67     return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
     68             0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
     69   }
     70   return 0;
     71 }
     72 VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
     73 #elif defined(__ARM_NEON__)
     74 // define a dummy function to enable turning off NEON at runtime by setting
     75 // VP8DecGetCPUInfo = NULL
     76 static int armCPUInfo(CPUFeature feature) {
     77   (void)feature;
     78   return 1;
     79 }
     80 VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
     81 #else
     82 VP8CPUInfo VP8GetCPUInfo = NULL;
     83 #endif
     84 
     85 #if defined(__cplusplus) || defined(c_plusplus)
     86 }    // extern "C"
     87 #endif
     88