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(SK_CPU_X86)
12 #if defined(SK_BUILD_FOR_WIN)
13 #include <intrin.h>
cpuid(uint32_t abcd[4])14 static void cpuid (uint32_t abcd[4]) { __cpuid ((int*)abcd, 1); }
cpuid7(uint32_t abcd[4])15 static void cpuid7(uint32_t abcd[4]) { __cpuidex((int*)abcd, 7, 0); }
xgetbv(uint32_t xcr)16 static uint64_t xgetbv(uint32_t xcr) { return _xgetbv(xcr); }
17 #else
18 #include <cpuid.h>
19 #if !defined(__cpuid_count) // Old Mac Clang doesn't have this defined.
20 #define __cpuid_count(eax, ecx, a, b, c, d) \
21 __asm__("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(eax), "2"(ecx))
22 #endif
cpuid(uint32_t abcd[4])23 static void cpuid (uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); }
cpuid7(uint32_t abcd[4])24 static void cpuid7(uint32_t abcd[4]) {
25 __cpuid_count(7, 0, abcd[0], abcd[1], abcd[2], abcd[3]);
26 }
xgetbv(uint32_t xcr)27 static uint64_t xgetbv(uint32_t xcr) {
28 uint32_t eax, edx;
29 __asm__ __volatile__ ( "xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr));
30 return (uint64_t)(edx) << 32 | eax;
31 }
32 #endif
33
read_cpu_features()34 static uint32_t read_cpu_features() {
35 uint32_t features = 0;
36 uint32_t abcd[4] = {0,0,0,0};
37
38 // You might want to refer to http://www.sandpile.org/x86/cpuid.htm
39
40 cpuid(abcd);
41 if (abcd[3] & (1<<25)) { features |= SkCpu:: SSE1; }
42 if (abcd[3] & (1<<26)) { features |= SkCpu:: SSE2; }
43 if (abcd[2] & (1<< 0)) { features |= SkCpu:: SSE3; }
44 if (abcd[2] & (1<< 9)) { features |= SkCpu::SSSE3; }
45 if (abcd[2] & (1<<19)) { features |= SkCpu::SSE41; }
46 if (abcd[2] & (1<<20)) { features |= SkCpu::SSE42; }
47
48 if ((abcd[2] & (3<<26)) == (3<<26) // XSAVE + OSXSAVE
49 && (xgetbv(0) & (3<<1)) == (3<<1)) { // XMM and YMM state enabled.
50 if (abcd[2] & (1<<28)) { features |= SkCpu:: AVX; }
51 if (abcd[2] & (1<<29)) { features |= SkCpu::F16C; }
52 if (abcd[2] & (1<<12)) { features |= SkCpu:: FMA; }
53
54 cpuid7(abcd);
55 if (abcd[1] & (1<<5)) { features |= SkCpu::AVX2; }
56 if (abcd[1] & (1<<3)) { features |= SkCpu::BMI1; }
57 if (abcd[1] & (1<<8)) { features |= SkCpu::BMI2; }
58
59 if ((xgetbv(0) & (7<<5)) == (7<<5)) { // All ZMM state bits enabled too.
60 if (abcd[1] & (1<<16)) { features |= SkCpu::AVX512F; }
61 if (abcd[1] & (1<<17)) { features |= SkCpu::AVX512DQ; }
62 if (abcd[1] & (1<<21)) { features |= SkCpu::AVX512IFMA; }
63 if (abcd[1] & (1<<26)) { features |= SkCpu::AVX512PF; }
64 if (abcd[1] & (1<<27)) { features |= SkCpu::AVX512ER; }
65 if (abcd[1] & (1<<28)) { features |= SkCpu::AVX512CD; }
66 if (abcd[1] & (1<<30)) { features |= SkCpu::AVX512BW; }
67 if (abcd[1] & (1<<31)) { features |= SkCpu::AVX512VL; }
68 }
69 }
70 return features;
71 }
72
73 #elif defined(SK_CPU_ARM64) && __has_include(<sys/auxv.h>)
74 #include <sys/auxv.h>
75
read_cpu_features()76 static uint32_t read_cpu_features() {
77 const uint32_t kHWCAP_CRC32 = (1<< 7),
78 kHWCAP_ASIMDHP = (1<<10);
79
80 uint32_t features = 0;
81 uint32_t hwcaps = getauxval(AT_HWCAP);
82 if (hwcaps & kHWCAP_CRC32 ) { features |= SkCpu::CRC32; }
83 if (hwcaps & kHWCAP_ASIMDHP) { features |= SkCpu::ASIMDHP; }
84 return features;
85 }
86
87 #elif defined(SK_CPU_ARM32) && __has_include(<sys/auxv.h>) && \
88 (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18)
89 // sys/auxv.h will always be present in the Android NDK due to unified
90 //headers, but getauxval is only defined for API >= 18.
91 #include <sys/auxv.h>
92
read_cpu_features()93 static uint32_t read_cpu_features() {
94 const uint32_t kHWCAP_NEON = (1<<12);
95 const uint32_t kHWCAP_VFPv4 = (1<<16);
96
97 uint32_t features = 0;
98 uint32_t hwcaps = getauxval(AT_HWCAP);
99 if (hwcaps & kHWCAP_NEON ) {
100 features |= SkCpu::NEON;
101 if (hwcaps & kHWCAP_VFPv4) { features |= SkCpu::NEON_FMA|SkCpu::VFP_FP16; }
102 }
103 return features;
104 }
105
106 #elif defined(SK_CPU_ARM32) && __has_include(<cpu-features.h>)
107 #include <cpu-features.h>
108
read_cpu_features()109 static uint32_t read_cpu_features() {
110 uint32_t features = 0;
111 uint64_t cpu_features = android_getCpuFeatures();
112 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) { features |= SkCpu::NEON; }
113 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON_FMA) { features |= SkCpu::NEON_FMA; }
114 if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFP_FP16) { features |= SkCpu::VFP_FP16; }
115 return features;
116 }
117
118 #else
read_cpu_features()119 static uint32_t read_cpu_features() {
120 return 0;
121 }
122
123 #endif
124
125 uint32_t SkCpu::gCachedFeatures = 0;
126
CacheRuntimeFeatures()127 void SkCpu::CacheRuntimeFeatures() {
128 static SkOnce once;
129 once([] { gCachedFeatures = read_cpu_features(); });
130 }
131