1// Copyright 2015, 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 <sys/time.h>
28#include "globals-vixl.h"
29
30#include "aarch64/instructions-aarch64.h"
31#include "aarch64/macro-assembler-aarch64.h"
32
33using namespace vixl;
34using namespace vixl::aarch64;
35
36static const int kDefaultIterationCount = 100000;
37
38// This program focuses on emitting branch instructions targeting a label bound
39// very closely. Here the MacroAssembler is used. This exercises label binding
40// and patching mechanisms, as well as the veneer resolving mechanisms for
41// branches not requiring veneers.
42int main(int argc, char* argv[]) {
43  int iterations = 0;
44
45  switch (argc) {
46    case 1:
47      iterations = kDefaultIterationCount;
48      break;
49    case 2:
50      iterations = atoi(argv[1]);
51      break;
52    default:
53      printf("Usage: %s [#iterations]\n", argv[0]);
54      exit(1);
55  }
56
57  const int buffer_size = 256 * KBytes;
58  const int instructions_per_iteration = 4;
59  const int max_buffer_iterations =
60      buffer_size / (instructions_per_iteration * kInstructionSize);
61
62  timeval start;
63  gettimeofday(&start, NULL);
64  MacroAssembler masm(buffer_size);
65
66#define __ masm.
67
68  for (int i = 0; i < iterations;) {
69    masm.Reset();
70    for (int j = 0; (j < max_buffer_iterations) && (i < iterations); ++j, ++i) {
71      Label target;
72      __ B(&target);
73      __ B(eq, &target);
74      __ Cbz(x2, &target);
75      __ Tbz(x3, 2, &target);
76      __ Bind(&target);
77    }
78  }
79
80  masm.FinalizeCode();
81
82  timeval end;
83  gettimeofday(&end, NULL);
84  double delta = (end.tv_sec - start.tv_sec) +
85                 static_cast<double>(end.tv_usec - start.tv_usec) / 1000000;
86  printf("A64: time for %d iterations: %gs\n", iterations, delta);
87
88  return 0;
89}
90