1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkCpu.h"
9 #include "SkOnce.h"
10
11 #if !defined(__has_include)
12 #define __has_include(x) 0
13 #endif
14
15 #if defined(SK_CPU_X86)
16 #if defined(SK_BUILD_FOR_WIN32)
17 #include <intrin.h>
cpuid(uint32_t abcd[4])18 static void cpuid (uint32_t abcd[4]) { __cpuid ((int*)abcd, 1); }
cpuid7(uint32_t abcd[4])19 static void cpuid7(uint32_t abcd[4]) { __cpuidex((int*)abcd, 7, 0); }
xgetbv(uint32_t xcr)20 static uint64_t xgetbv(uint32_t xcr) { return _xgetbv(xcr); }
21 #else
22 #include <cpuid.h>
23 #if !defined(__cpuid_count) // Old Mac Clang doesn't have this defined.
24 #define __cpuid_count(eax, ecx, a, b, c, d) \
25 __asm__("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(eax), "2"(ecx))
26 #endif
cpuid(uint32_t abcd[4])27 static void cpuid (uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); }
cpuid7(uint32_t abcd[4])28 static void cpuid7(uint32_t abcd[4]) {
29 __cpuid_count(7, 0, abcd[0], abcd[1], abcd[2], abcd[3]);
30 }
xgetbv(uint32_t xcr)31 static uint64_t xgetbv(uint32_t xcr) {
32 uint32_t eax, edx;
33 __asm__ __volatile__ ( "xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr));
34 return (uint64_t)(edx) << 32 | eax;
35 }
36 #endif
37
read_cpu_features()38 static uint32_t read_cpu_features() {
39 uint32_t features = 0;
40 uint32_t abcd[4] = {0,0,0,0};
41
42 // You might want to refer to http://www.sandpile.org/x86/cpuid.htm
43
44 cpuid(abcd);
45 if (abcd[3] & (1<<25)) { features |= SkCpu:: SSE1; }
46 if (abcd[3] & (1<<26)) { features |= SkCpu:: SSE2; }
47 if (abcd[2] & (1<< 0)) { features |= SkCpu:: SSE3; }
48 if (abcd[2] & (1<< 9)) { features |= SkCpu::SSSE3; }
49 if (abcd[2] & (1<<19)) { features |= SkCpu::SSE41; }
50 if (abcd[2] & (1<<20)) { features |= SkCpu::SSE42; }
51
52 if ((abcd[2] & (3<<26)) == (3<<26) // XSAVE + OSXSAVE
53 && (xgetbv(0) & (3<<1)) == (3<<1)) { // XMM and YMM state enabled.
54 if (abcd[2] & (1<<28)) { features |= SkCpu:: AVX; }
55 if (abcd[2] & (1<<29)) { features |= SkCpu::F16C; }
56 if (abcd[2] & (1<<12)) { features |= SkCpu:: FMA; }
57
58 cpuid7(abcd);
59 if (abcd[1] & (1<<5)) { features |= SkCpu::AVX2; }
60 if (abcd[1] & (1<<3)) { features |= SkCpu::BMI1; }
61 if (abcd[1] & (1<<8)) { features |= SkCpu::BMI2; }
62
63 if ((xgetbv(0) & (7<<5)) == (7<<5)) { // All ZMM state bits enabled too.
64 if (abcd[1] & (1<<16)) { features |= SkCpu::AVX512F; }
65 if (abcd[1] & (1<<17)) { features |= SkCpu::AVX512DQ; }
66 if (abcd[1] & (1<<21)) { features |= SkCpu::AVX512IFMA; }
67 if (abcd[1] & (1<<26)) { features |= SkCpu::AVX512PF; }
68 if (abcd[1] & (1<<27)) { features |= SkCpu::AVX512ER; }
69 if (abcd[1] & (1<<28)) { features |= SkCpu::AVX512CD; }
70 if (abcd[1] & (1<<30)) { features |= SkCpu::AVX512BW; }
71 if (abcd[1] & (1<<31)) { features |= SkCpu::AVX512VL; }
72 }
73 }
74 return features;
75 }
76
77 #elif defined(SK_CPU_ARM64) && __has_include(<sys/auxv.h>)
78 #include <sys/auxv.h>
79
read_cpu_features()80 static uint32_t read_cpu_features() {
81 const uint32_t HWCAP_CRC32 = (1<<7);
82
83 uint32_t features = 0;
84 uint32_t hwcaps = getauxval(AT_HWCAP);
85 if (hwcaps & HWCAP_CRC32) { features |= SkCpu::CRC32; }
86 return features;
87 }
88
89 #elif defined(SK_CPU_ARM32) && __has_include(<sys/auxv.h>)
90 // sys/auxv.h won't be present on NDK builds before API v21.
91 #include <sys/auxv.h>
92
read_cpu_features()93 static uint32_t read_cpu_features() {
94 const uint32_t HWCAP_VFPv4 = (1<<16);
95
96 uint32_t features = 0;
97 uint32_t hwcaps = getauxval(AT_HWCAP);
98 if (hwcaps & HWCAP_VFPv4) { features |= SkCpu::NEON|SkCpu::NEON_FMA|SkCpu::VFP_FP16; }
99 return features;
100 }
101
102 #elif defined(SK_CPU_ARM32) && __has_include(<cpu-features.h>)
103 #include <cpu-features.h>
104
read_cpu_features()105 static uint32_t read_cpu_features() {
106 uint32_t features = 0;
107 uint64_t cpu_features = android_getCpuFeatures();
108 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) { features |= SkCpu::NEON; }
109 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON_FMA) { features |= SkCpu::NEON_FMA; }
110 if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFP_FP16) { features |= SkCpu::VFP_FP16; }
111 return features;
112 }
113
114 #else
read_cpu_features()115 static uint32_t read_cpu_features() {
116 return 0;
117 }
118
119 #endif
120
121 uint32_t SkCpu::gCachedFeatures = 0;
122
CacheRuntimeFeatures()123 void SkCpu::CacheRuntimeFeatures() {
124 static SkOnce once;
125 once([] { gCachedFeatures = read_cpu_features(); });
126 }
127