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#if defined(__cplusplus) || defined(c_plusplus) 21extern "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__) 30static 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__) 39static 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) 50static 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} 61VP8CPUInfo VP8GetCPUInfo = x86CPUInfo; 62#elif defined(WEBP_ANDROID_NEON) 63static 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} 72VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo; 73#elif defined(__ARM_NEON__) 74// define a dummy function to enable turning off NEON at runtime by setting 75// VP8DecGetCPUInfo = NULL 76static int armCPUInfo(CPUFeature feature) { 77 (void)feature; 78 return 1; 79} 80VP8CPUInfo VP8GetCPUInfo = armCPUInfo; 81#else 82VP8CPUInfo VP8GetCPUInfo = NULL; 83#endif 84 85#if defined(__cplusplus) || defined(c_plusplus) 86} // extern "C" 87#endif 88