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
33 using namespace vixl;
34 using namespace vixl::aarch64;
35
36 static 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.
main(int argc,char * argv[])42 int 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