1 /*
2 * Copyright (c) 2011 The LibYuv project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "libyuv/cpu_id.h"
12 #include "libyuv/basic_types.h" // for CPU_X86
13
14 #ifdef _MSC_VER
15 #include <intrin.h>
16 #endif
17
18 // TODO(fbarchard): Use cpuid.h when gcc 4.4 is used on OSX and Linux.
19 #if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
__cpuid(int cpu_info[4],int info_type)20 static inline void __cpuid(int cpu_info[4], int info_type) {
21 __asm__ volatile (
22 "mov %%ebx, %%edi\n"
23 "cpuid\n"
24 "xchg %%edi, %%ebx\n"
25 : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
26 : "a"(info_type)
27 );
28 }
29 #elif defined(__i386__) || defined(__x86_64__)
__cpuid(int cpu_info[4],int info_type)30 static inline void __cpuid(int cpu_info[4], int info_type) {
31 __asm__ volatile (
32 "cpuid\n"
33 : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
34 : "a"(info_type)
35 );
36 }
37 #endif
38
39 namespace libyuv {
40
41 // CPU detect function for SIMD instruction sets.
42 static int cpu_info_ = 0;
43
44 // TODO(fbarchard): (cpu_info[2] & 0x10000000 ? kCpuHasAVX : 0)
InitCpuFlags()45 static void InitCpuFlags() {
46 #ifdef CPU_X86
47 int cpu_info[4];
48 __cpuid(cpu_info, 1);
49 cpu_info_ = (cpu_info[3] & 0x04000000 ? kCpuHasSSE2 : 0) |
50 (cpu_info[2] & 0x00000200 ? kCpuHasSSSE3 : 0) |
51 kCpuInitialized;
52 #elif defined(__ARM_NEON__)
53 // gcc -mfpu=neon defines __ARM_NEON__
54 // Enable Neon if you want support for Neon and Arm, and use MaskCpuFlags
55 // to disable Neon on devices that do not have it.
56 cpu_info_ = kCpuHasNEON | kCpuInitialized;
57 #else
58 cpu_info_ = kCpuInitialized;
59 #endif
60 }
61
MaskCpuFlags(int enable_flags)62 void MaskCpuFlags(int enable_flags) {
63 InitCpuFlags();
64 cpu_info_ &= enable_flags;
65 }
66
TestCpuFlag(int flag)67 bool TestCpuFlag(int flag) {
68 if (0 == cpu_info_) {
69 InitCpuFlags();
70 }
71 return cpu_info_ & flag ? true : false;
72 }
73
74 } // namespace libyuv
75