results in 32 bit mode

32bit_test.cpp

#include "benchmark/benchmark.h"
#include <cstdint>
#include <limits>

using namespace benchmark;

typedef std::uint32_t UInt32;
typedef std::uint64_t UInt64;

template <class IntType>
void BM_IntAddingAndComparisons(State& st) {
  //Use the upper bits of the IntType to try and defeat the optimizer.
  IntType const Iters = 10000000; 
  IntType const Max = std::numeric_limits<IntType>::max();
  IntType const Stop = Max - Iters;
  while (st.KeepRunning()) {
    for (IntType i =  Stop; i != Max; ++i) {
      DoNotOptimize(i);
    }
  }
}
BENCHMARK_TEMPLATE(BM_IntAddingAndComparisons, UInt32);
BENCHMARK_TEMPLATE(BM_IntAddingAndComparisons, UInt64);

BENCHMARK_MAIN()

gistfile1.txt

Run on (8 X 4228.74 MHz CPU s)
2015-10-02 03:06:55
Benchmark                            Time(ns)    CPU(ns) Iterations
-------------------------------------------------------------------
BM_IntAddingAndComparisons<UInt32>    5063790    5066026        833                                 
BM_IntAddingAndComparisons<UInt64>    6406909    6406015        665