1 // Copyright 2020, VIXL authors
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are met:
6 //
7 // * Redistributions of source code must retain the above copyright notice,
8 // this list of conditions and the following disclaimer.
9 // * Redistributions in binary form must reproduce the above copyright notice,
10 // this list of conditions and the following disclaimer in the documentation
11 // and/or other materials provided with the distribution.
12 // * Neither the name of ARM Limited nor the names of its contributors may be
13 // used to endorse or promote products derived from this software without
14 // specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 #include "examples.h"
28
29 using namespace vixl;
30 using namespace vixl::aarch64;
31
32 // Demonstrate the use of VIXL's CPU feature detection, printing the features
33 // that VIXL detects.
34
35 #ifndef TEST_EXAMPLES
main()36 int main() {
37 // Simple native deployments should initialise CPU features using
38 // `InferFromOS()`. If not on an AArch64 host, this returns nothing.
39 std::cout << "==== CPUFeatures::InferFromOS() ====\n";
40 std::cout << CPUFeatures::InferFromOS() << "\n";
41
42 // VIXL assumes support for FP, NEON and CRC32 by default. These features were
43 // implemented before the CPUFeatures mechanism.
44 std::cout << "==== CPUFeatures::AArch64LegacyBaseline() ====\n";
45 std::cout << CPUFeatures::AArch64LegacyBaseline() << "\n";
46
47 // Retrieve a list of all supported CPU features.
48 std::cout << "==== CPUFeatures::All() ====\n";
49 std::cout << CPUFeatures::All() << "\n";
50
51 return 0;
52 }
53 #endif
54