benchmarks/bench-branch-link-masm.cc

// Copyright 2015, ARM Limited
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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 int kDefaultIterationsCount = 100000;

// This program focuses on the emission of branches and veneers.
int main(int argc, char* argv[]) {
  int iterations = 0;

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

  size_t base_buf_size = iterations * 4 * kInstructionSize;
  MacroAssembler masm(base_buf_size);

#define __ masm.

  Label target_1, target_2, target_3, target_4;
  for (int i = 0; i < iterations; i++) {
    __ B(&target_1);
  }
  __ Bind(&target_1);
  for (int i = 0; i < iterations; i++) {
    __ B(eq, &target_2);
  }
  __ Bind(&target_2);
  for (int i = 0; i < iterations; i++) {
    __ Cbz(x2, &target_3);
  }
  __ Bind(&target_3);
  for (int i = 0; i < iterations; i++) {
    __ Tbz(x3, 2, &target_4);
  }
  __ Bind(&target_4);

  masm.FinalizeCode();

  return 0;
}