1 // Copyright 2019, 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 "globals-vixl.h"
28
29 #include "aarch64/instructions-aarch64.h"
30 #include "aarch64/macro-assembler-aarch64.h"
31
32 #include "bench-utils.h"
33
34 using namespace vixl;
35 using namespace vixl::aarch64;
36
37 // Like PrintDisassembler, but to prevent the I/O overhead from dominating the
38 // benchmark, don't actually print anything.
39 class BenchDisassembler : public Disassembler {
40 public:
BenchDisassembler()41 BenchDisassembler() : Disassembler(), generated_chars_(0) {}
42
GetGeneratedCharCount() const43 size_t GetGeneratedCharCount() const { return generated_chars_; }
44
45 protected:
ProcessOutput(const Instruction * instr)46 virtual void ProcessOutput(const Instruction* instr) VIXL_OVERRIDE {
47 USE(instr);
48 generated_chars_ += strlen(GetOutput());
49 }
50
51 size_t generated_chars_;
52 };
53
54 // This program measures the performance of the disassembler, using the same
55 // code sequence used in bench-mixed-masm.cc.
main(int argc,char * argv[])56 int main(int argc, char* argv[]) {
57 BenchCLI cli(argc, argv);
58 if (cli.ShouldExitEarly()) return cli.GetExitCode();
59
60 const size_t buffer_size = 256 * KBytes;
61 MacroAssembler masm(buffer_size);
62 masm.SetCPUFeatures(CPUFeatures::All());
63 BenchCodeGenerator generator(&masm);
64
65 masm.Reset();
66 generator.Generate(buffer_size);
67 masm.FinalizeCode();
68
69 const Instruction* start =
70 masm.GetBuffer()->GetStartAddress<const Instruction*>();
71 const Instruction* end =
72 masm.GetBuffer()->GetEndAddress<const Instruction*>();
73
74 Decoder decoder;
75 BenchDisassembler disasm;
76 decoder.AppendVisitor(&disasm);
77
78 BenchTimer timer;
79
80 size_t iterations = 0;
81 size_t generated_chars = 0;
82 do {
83 decoder.Decode(start, end);
84 generated_chars += disasm.GetGeneratedCharCount();
85
86 iterations++;
87 } while (!timer.HasRunFor(cli.GetRunTimeInSeconds()));
88
89 printf("Disassembled %" PRIu64 " characters.\n",
90 static_cast<uint64_t>(generated_chars));
91 cli.PrintResults(iterations, timer.GetElapsedSeconds());
92 return cli.GetExitCode();
93 }
94