benchmarks/bench-dataop.cc

// Copyright 2014, ARM Limited
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
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//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of ARM Limited nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
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#include "vixl/a64/macro-assembler-a64.h"
#include "vixl/a64/instructions-a64.h"
#include "vixl/globals.h"

using namespace vixl;

static const unsigned kDefaultInstructionCount = 100000;

// This program focuses on emitting simple instructions.
//
// This code will emit a given number of 'add x0, x1, x2' in a fixed size
// buffer, looping over the buffer if necessary. This code therefore focuses
// on Emit and Operand.
int main(int argc, char* argv[]) {
  unsigned instructions = 0;

  switch (argc) {
    case 1:
      instructions = kDefaultInstructionCount;
      break;
    case 2:
      instructions = atoi(argv[1]);
      break;
    default:
      printf("Usage: %s [#instructions]\n", argv[0]);
      exit(1);
  }

  const unsigned buffer_size = 256 * KBytes;
  const unsigned buffer_instruction_count = buffer_size / kInstructionSize;
  MacroAssembler masm(buffer_size);

#define __ masm.

  unsigned rounds = instructions / buffer_instruction_count;
  for (unsigned i = 0; i < rounds; ++i) {
    {
      InstructionAccurateScope scope(&masm, buffer_instruction_count);
      for (unsigned j = 0; j < buffer_instruction_count; ++j) {
        __ add(x0, x1, Operand(x2));
      }
    }
    masm.Reset();
  }

  unsigned remaining = instructions % buffer_instruction_count;
  {
    InstructionAccurateScope scope(&masm, remaining);
    for (unsigned i = 0; i < remaining; ++i) {
      __ add(x0, x1, Operand(x2));
    }
  }

  masm.FinalizeCode();

  return 0;
}