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)
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__)
GetCPUInfo(int cpu_info[4],int info_type)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)
x86CPUInfo(CPUFeature feature)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)
AndroidCPUInfo(CPUFeature feature)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
armCPUInfo(CPUFeature feature)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