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
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19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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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 "bench-utils.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 // Like PrintDisassembler, but to prevent the I/O overhead from dominating the
37 // benchmark, don't actually print anything.
38 class BenchDisassembler : public Disassembler {
39 public:
BenchDisassembler()40 BenchDisassembler() : Disassembler(), generated_chars_(0) {}
41
GetGeneratedCharCount() const42 size_t GetGeneratedCharCount() const { return generated_chars_; }
43
44 protected:
45 virtual void ProcessOutput(const Instruction* instr) VIXL_OVERRIDE {
46 USE(instr);
47 generated_chars_ += strlen(GetOutput());
48 }
49
50 size_t generated_chars_;
51 };
52
53 // This program measures the performance of the disassembler, using the same
54 // code sequence used in bench-mixed-masm.cc.
main(int argc, char* argv[])55 int main(int argc, char* argv[]) {
56 BenchCLI cli(argc, argv);
57 if (cli.ShouldExitEarly()) return cli.GetExitCode();
58
59 const size_t buffer_size = 256 * KBytes;
60 MacroAssembler masm(buffer_size);
61 masm.SetCPUFeatures(CPUFeatures::All());
62 BenchCodeGenerator generator(&masm);
63
64 masm.Reset();
65 generator.Generate(buffer_size);
66 masm.FinalizeCode();
67
68 const Instruction* start =
69 masm.GetBuffer()->GetStartAddress<const Instruction*>();
70 const Instruction* end =
71 masm.GetBuffer()->GetEndAddress<const Instruction*>();
72
73 Decoder decoder;
74 BenchDisassembler disasm;
75 decoder.AppendVisitor(&disasm);
76
77 BenchTimer timer;
78
79 size_t iterations = 0;
80 size_t generated_chars = 0;
81 do {
82 decoder.Decode(start, end);
83 generated_chars += disasm.GetGeneratedCharCount();
84
85 iterations++;
86 } while (!timer.HasRunFor(cli.GetRunTimeInSeconds()));
87
88 printf("Disassembled %" PRIu64 " characters.\n",
89 static_cast<uint64_t>(generated_chars));
90 cli.PrintResults(iterations, timer.GetElapsedSeconds());
91 return cli.GetExitCode();
92 }
93