1// Copyright 2016, 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 <stdint.h>
28#include <stdio.h>
29#include <sys/time.h>
30
31#include "aarch32/constants-aarch32.h"
32#include "aarch32/instructions-aarch32.h"
33#include "aarch32/macro-assembler-aarch32.h"
34
35using namespace vixl;
36using namespace vixl::aarch32;
37
38static const int kDefaultIterationCount = 100000;
39
40// This program focuses on emitting branch instructions targeting a label bound
41// very closely. Here the MacroAssembler is used. This exercises label binding
42// and patching mechanisms, as well as the veneer resolving mechanisms for
43// branches not requiring veneers.
44void benchmark(int iterations, InstructionSet isa) {
45  const int buffer_size = 256 * KBytes;
46
47  timeval start;
48  gettimeofday(&start, NULL);
49  MacroAssembler masm(buffer_size);
50  masm.UseInstructionSet(isa);
51
52#define __ masm.
53
54  for (int i = 0; i < iterations; i++) {
55    Label target;
56    __ B(&target);
57    __ B(eq, &target);
58    __ Bl(&target);
59    __ Blx(&target);
60    __ Bind(&target);
61  }
62
63  masm.FinalizeCode();
64  timeval end;
65  gettimeofday(&end, NULL);
66  double delta = (end.tv_sec - start.tv_sec) +
67                 static_cast<double>(end.tv_usec - start.tv_usec) / 1000000;
68  printf("%s: time for %d iterations: %gs\n",
69         isa == T32 ? "T32" : "A32",
70         iterations,
71         delta);
72}
73
74
75int main(int argc, char* argv[]) {
76  int iterations = 0;
77
78  switch (argc) {
79    case 1:
80      iterations = kDefaultIterationCount;
81      break;
82    case 2:
83      iterations = atoi(argv[1]);
84      break;
85    default:
86      printf("Usage: %s [#iterations]\n", argv[0]);
87      exit(1);
88  }
89
90#ifdef VIXL_INCLUDE_TARGET_A32
91  benchmark(iterations, A32);
92#endif
93#ifdef VIXL_INCLUDE_TARGET_T32
94  benchmark(iterations, T32);
95#endif
96
97  return 0;
98}
99