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      1 // Copyright 2011 Google Inc. All Rights Reserved.
      2 //
      3 // This code is licensed under the same terms as WebM:
      4 //  Software License Agreement:  http://www.webmproject.org/license/software/
      5 //  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
      6 // -----------------------------------------------------------------------------
      7 //
      8 // CPU detection
      9 //
     10 // Author: Christian Duvivier (cduvivier (at) google.com)
     11 
     12 #include "./dsp.h"
     13 
     14 #if defined(__ANDROID__)
     15 #include "./cpu-features.h"
     16 #endif
     17 
     18 #if defined(__cplusplus) || defined(c_plusplus)
     19 extern "C" {
     20 #endif
     21 
     22 //------------------------------------------------------------------------------
     23 // SSE2 detection.
     24 //
     25 
     26 // apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
     27 #if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
     28 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
     29   __asm__ volatile (
     30     "mov %%ebx, %%edi\n"
     31     "cpuid\n"
     32     "xchg %%edi, %%ebx\n"
     33     : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
     34     : "a"(info_type));
     35 }
     36 #elif defined(__i386__) || defined(__x86_64__)
     37 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
     38   __asm__ volatile (
     39     "cpuid\n"
     40     : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
     41     : "a"(info_type));
     42 }
     43 #elif defined(WEBP_MSC_SSE2)
     44 #define GetCPUInfo __cpuid
     45 #endif
     46 
     47 #if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
     48 static int x86CPUInfo(CPUFeature feature) {
     49   int cpu_info[4];
     50   GetCPUInfo(cpu_info, 1);
     51   if (feature == kSSE2) {
     52     return 0 != (cpu_info[3] & 0x04000000);
     53   }
     54   if (feature == kSSE3) {
     55     return 0 != (cpu_info[2] & 0x00000001);
     56   }
     57   return 0;
     58 }
     59 VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
     60 #elif defined(WEBP_ANDROID_NEON)
     61 static int AndroidCPUInfo(CPUFeature feature) {
     62   const AndroidCpuFamily cpu_family = android_getCpuFamily();
     63   const uint64_t cpu_features = android_getCpuFeatures();
     64   if (feature == kNEON) {
     65     return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
     66             0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
     67   }
     68   return 0;
     69 }
     70 VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
     71 #elif defined(__ARM_NEON__)
     72 // define a dummy function to enable turning off NEON at runtime by setting
     73 // VP8DecGetCPUInfo = NULL
     74 static int armCPUInfo(CPUFeature feature) {
     75   (void)feature;
     76   return 1;
     77 }
     78 VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
     79 #else
     80 VP8CPUInfo VP8GetCPUInfo = NULL;
     81 #endif
     82 
     83 #if defined(__cplusplus) || defined(c_plusplus)
     84 }    // extern "C"
     85 #endif
     86