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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21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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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 targeting a label bound
37 // very closely. Here the MacroAssembler is used. This exercises label binding
38 // and patching mechanisms, as well as the veneer resolving mechanisms for
39 // branches not requiring veneers.
main(int argc, char* argv[])40 int main(int argc, char* argv[]) {
41 BenchCLI cli(argc, argv);
42 if (cli.ShouldExitEarly()) return cli.GetExitCode();
43
44 const size_t buffer_size = 256 * KBytes;
45 const size_t instructions_per_iteration = 4;
46 const size_t max_buffer_iterations =
47 buffer_size / (instructions_per_iteration * kInstructionSize);
48 MacroAssembler masm(buffer_size);
49
50 BenchTimer timer;
51
52 size_t iterations = 0;
53 do {
54 masm.Reset();
55 for (size_t i = 0; i < max_buffer_iterations; ++i) {
56 Label target;
57 masm.B(&target);
58 masm.B(eq, &target);
59 masm.Cbz(x2, &target);
60 masm.Tbz(x3, 2, &target);
61 masm.Bind(&target);
62 }
63 masm.FinalizeCode();
64 iterations++;
65 } while (!timer.HasRunFor(cli.GetRunTimeInSeconds()));
66
67 cli.PrintResults(iterations, timer.GetElapsedSeconds());
68 return cli.GetExitCode();
69 }
70