1 // Copyright 2019, 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
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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 "bench-utils.h"
28 #include "globals-vixl.h"
29
30 #include "aarch64/instructions-aarch64.h"
31 #include "aarch64/macro-assembler-aarch64.h"
32
33 using namespace vixl;
34 using namespace vixl::aarch64;
35
36 // This program focuses on emitting branch instructions.
37 //
38 // This code will emit a given number of branch immediate to the next
39 // instructions in a fixed size buffer, looping over the buffer if necessary.
40 // This code therefore focuses on Emit and label binding/patching.
main(int argc, char* argv[])41 int main(int argc, char* argv[]) {
42 BenchCLI cli(argc, argv);
43 if (cli.ShouldExitEarly()) return cli.GetExitCode();
44
45 const size_t buffer_size = 256 * KBytes;
46 const size_t buffer_instruction_count = buffer_size / kInstructionSize;
47 MacroAssembler masm(buffer_size);
48
49 // We emit a branch to the next instruction.
50
51 BenchTimer timer;
52
53 size_t iterations = 0;
54 do {
55 masm.Reset();
56 {
57 ExactAssemblyScope scope(&masm, buffer_size);
58 for (size_t i = 0; i < buffer_instruction_count; ++i) {
59 Label target;
60 masm.b(&target);
61 masm.bind(&target);
62 }
63 }
64 masm.FinalizeCode();
65 iterations++;
66 } while (!timer.HasRunFor(cli.GetRunTimeInSeconds()));
67
68 cli.PrintResults(iterations, timer.GetElapsedSeconds());
69 return cli.GetExitCode();
70 }
71