1 // Copyright 2015, ARM Limited
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 "vixl/a64/macro-assembler-a64.h"
28 #include "vixl/a64/instructions-a64.h"
29 #include "vixl/globals.h"
30
31 using namespace vixl;
32
33 static const int kDefaultIterationsCount = 100000;
34
35 // This program focuses on the emission of branches and veneers.
main(int argc,char * argv[])36 int main(int argc, char* argv[]) {
37 int iterations = 0;
38
39 switch (argc) {
40 case 1: iterations = kDefaultIterationsCount; break;
41 case 2: iterations = atoi(argv[1]); break;
42 default:
43 printf("Usage: %s [#iterations]\n", argv[0]);
44 exit(1);
45 }
46
47 size_t base_buf_size = iterations * 4 * kInstructionSize;
48 MacroAssembler masm(base_buf_size);
49
50 #define __ masm.
51
52 Label target_1, target_2, target_3, target_4;
53 for (int i = 0; i < iterations; i++) {
54 __ B(&target_1);
55 }
56 __ Bind(&target_1);
57 for (int i = 0; i < iterations; i++) {
58 __ B(eq, &target_2);
59 }
60 __ Bind(&target_2);
61 for (int i = 0; i < iterations; i++) {
62 __ Cbz(x2, &target_3);
63 }
64 __ Bind(&target_3);
65 for (int i = 0; i < iterations; i++) {
66 __ Tbz(x3, 2, &target_4);
67 }
68 __ Bind(&target_4);
69
70 masm.FinalizeCode();
71
72 return 0;
73 }
74