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 //------------------------------------------------------------------------------
21 // SSE2 detection.
22 //
23
24 // apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
25 #if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
GetCPUInfo(int cpu_info[4],int info_type)26 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
27 __asm__ volatile (
28 "mov %%ebx, %%edi\n"
29 "cpuid\n"
30 "xchg %%edi, %%ebx\n"
31 : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
32 : "a"(info_type));
33 }
34 #elif defined(__i386__) || defined(__x86_64__)
GetCPUInfo(int cpu_info[4],int info_type)35 static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
36 __asm__ volatile (
37 "cpuid\n"
38 : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
39 : "a"(info_type));
40 }
41 #elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 150030729 // >= VS2008 SP1
42 #define GetCPUInfo(info, type) __cpuidex(info, type, 0) // set ecx=0
43 #elif defined(WEBP_MSC_SSE2)
44 #define GetCPUInfo __cpuid
45 #endif
46
47 // NaCl has no support for xgetbv or the raw opcode.
48 #if !defined(__native_client__) && (defined(__i386__) || defined(__x86_64__))
xgetbv(void)49 static WEBP_INLINE uint64_t xgetbv(void) {
50 const uint32_t ecx = 0;
51 uint32_t eax, edx;
52 // Use the raw opcode for xgetbv for compatibility with older toolchains.
53 __asm__ volatile (
54 ".byte 0x0f, 0x01, 0xd0\n"
55 : "=a"(eax), "=d"(edx) : "c" (ecx));
56 return ((uint64_t)edx << 32) | eax;
57 }
58 #elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 160040219 // >= VS2010 SP1
59 #define xgetbv() _xgetbv(0)
60 #elif defined(_M_IX86)
xgetbv(void)61 static WEBP_INLINE uint64_t xgetbv(void) {
62 uint32_t eax_, edx_;
63 __asm {
64 xor ecx, ecx // ecx = 0
65 // Use the raw opcode for xgetbv for compatibility with older toolchains.
66 __asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0
67 mov eax_, eax
68 mov edx_, edx
69 }
70 return ((uint64_t)edx_ << 32) | eax_;
71 }
72 #else
73 #define xgetbv() 0U // no AVX for older x64 or unrecognized toolchains.
74 #endif
75
76 #if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
x86CPUInfo(CPUFeature feature)77 static int x86CPUInfo(CPUFeature feature) {
78 int cpu_info[4];
79 GetCPUInfo(cpu_info, 1);
80 if (feature == kSSE2) {
81 return 0 != (cpu_info[3] & 0x04000000);
82 }
83 if (feature == kSSE3) {
84 return 0 != (cpu_info[2] & 0x00000001);
85 }
86 if (feature == kAVX) {
87 // bits 27 (OSXSAVE) & 28 (256-bit AVX)
88 if ((cpu_info[2] & 0x18000000) == 0x18000000) {
89 // XMM state and YMM state enabled by the OS.
90 return (xgetbv() & 0x6) == 0x6;
91 }
92 }
93 if (feature == kAVX2) {
94 if (x86CPUInfo(kAVX)) {
95 GetCPUInfo(cpu_info, 7);
96 return ((cpu_info[1] & 0x00000020) == 0x00000020);
97 }
98 }
99 return 0;
100 }
101 VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
102 #elif defined(WEBP_ANDROID_NEON) // NB: needs to be before generic NEON test.
AndroidCPUInfo(CPUFeature feature)103 static int AndroidCPUInfo(CPUFeature feature) {
104 const AndroidCpuFamily cpu_family = android_getCpuFamily();
105 const uint64_t cpu_features = android_getCpuFeatures();
106 if (feature == kNEON) {
107 return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
108 0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
109 }
110 return 0;
111 }
112 VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
113 #elif defined(WEBP_USE_NEON)
114 // define a dummy function to enable turning off NEON at runtime by setting
115 // VP8DecGetCPUInfo = NULL
armCPUInfo(CPUFeature feature)116 static int armCPUInfo(CPUFeature feature) {
117 (void)feature;
118 return 1;
119 }
120 VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
121 #elif defined(WEBP_USE_MIPS32)
mipsCPUInfo(CPUFeature feature)122 static int mipsCPUInfo(CPUFeature feature) {
123 (void)feature;
124 return 1;
125 }
126 VP8CPUInfo VP8GetCPUInfo = mipsCPUInfo;
127 #else
128 VP8CPUInfo VP8GetCPUInfo = NULL;
129 #endif
130
131