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Open Source Computer Vision Library
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87 lines
2.6 KiB
87 lines
2.6 KiB
// Copyright 2011 Google Inc. All Rights Reserved. |
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// |
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// Use of this source code is governed by a BSD-style license |
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// that can be found in the COPYING file in the root of the source |
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// tree. An additional intellectual property rights grant can be found |
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// in the file PATENTS. All contributing project authors may |
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// be found in the AUTHORS file in the root of the source tree. |
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// ----------------------------------------------------------------------------- |
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// |
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// CPU detection |
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// |
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// Author: Christian Duvivier (cduvivier@google.com) |
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#include "./dsp.h" |
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#if defined(__ANDROID__) |
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#include <cpu-features.h> |
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#endif |
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#if defined(__cplusplus) || defined(c_plusplus) |
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extern "C" { |
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#endif |
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//------------------------------------------------------------------------------ |
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// SSE2 detection. |
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// |
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// apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC. |
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#if (defined(__pic__) || defined(__PIC__)) && defined(__i386__) |
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static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) { |
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__asm__ volatile ( |
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"mov %%ebx, %%edi\n" |
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"cpuid\n" |
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"xchg %%edi, %%ebx\n" |
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: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3]) |
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: "a"(info_type)); |
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} |
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#elif defined(__i386__) || defined(__x86_64__) |
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static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) { |
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__asm__ volatile ( |
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"cpuid\n" |
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: "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3]) |
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: "a"(info_type)); |
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} |
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#elif defined(WEBP_MSC_SSE2) |
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#define GetCPUInfo __cpuid |
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#endif |
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#if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2) |
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static int x86CPUInfo(CPUFeature feature) { |
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int cpu_info[4]; |
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GetCPUInfo(cpu_info, 1); |
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if (feature == kSSE2) { |
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return 0 != (cpu_info[3] & 0x04000000); |
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} |
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if (feature == kSSE3) { |
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return 0 != (cpu_info[2] & 0x00000001); |
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} |
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return 0; |
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} |
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VP8CPUInfo VP8GetCPUInfo = x86CPUInfo; |
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#elif defined(WEBP_ANDROID_NEON) |
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static int AndroidCPUInfo(CPUFeature feature) { |
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const AndroidCpuFamily cpu_family = android_getCpuFamily(); |
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const uint64_t cpu_features = android_getCpuFeatures(); |
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if (feature == kNEON) { |
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return (cpu_family == ANDROID_CPU_FAMILY_ARM && |
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0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON)); |
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} |
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return 0; |
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} |
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VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo; |
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#elif defined(__ARM_NEON__) |
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// define a dummy function to enable turning off NEON at runtime by setting |
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// VP8DecGetCPUInfo = NULL |
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static int armCPUInfo(CPUFeature feature) { |
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(void)feature; |
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return 1; |
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} |
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VP8CPUInfo VP8GetCPUInfo = armCPUInfo; |
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#else |
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VP8CPUInfo VP8GetCPUInfo = NULL; |
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#endif |
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#if defined(__cplusplus) || defined(c_plusplus) |
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} // extern "C" |
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#endif
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