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
35 using namespace vixl;
36 using namespace vixl::aarch32;
37
38 static 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.
benchmark(int iterations,InstructionSet isa)44 void 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
main(int argc,char * argv[])75 int 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