benchmarks/aarch32/bench-branch-link-masm.cc

// Copyright 2016, VIXL authors
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//
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#include <stdint.h>
#include <stdio.h>
#include <sys/time.h>

#include "aarch32/constants-aarch32.h"
#include "aarch32/instructions-aarch32.h"
#include "aarch32/macro-assembler-aarch32.h"

using namespace vixl;
using namespace vixl::aarch32;

#ifdef VIXL_DEBUG
static const int kDefaultIterationsCount = 10000;
#else
static const int kDefaultIterationsCount = 100000;
#endif

// This program focuses on the emission of branches and veneers.
void benchmark(int iterations, InstructionSet isa) {
  const int buffer_size = 256 * KBytes;

  timeval start;
  gettimeofday(&start, NULL);
  MacroAssembler masm(buffer_size);
  masm.UseInstructionSet(isa);

#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++) {
    __ Bl(&target_3);
  }
  __ Bind(&target_3);
  for (int i = 0; i < iterations; i++) {
    __ Blx(&target_4);
  }
  __ Bind(&target_4);

  masm.FinalizeCode();
  timeval end;
  gettimeofday(&end, NULL);
  double delta = (end.tv_sec - start.tv_sec) +
                 static_cast<double>(end.tv_usec - start.tv_usec) / 1000000;
  printf("%s: time for %d iterations: %gs\n",
         isa == T32 ? "T32" : "A32",
         iterations,
         delta);
}


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);
  }

#ifdef VIXL_INCLUDE_TARGET_A32
  benchmark(iterations, A32);
#endif
#ifdef VIXL_INCLUDE_TARGET_T32
  benchmark(iterations, T32);
#endif

  return 0;
}