bench_long_rshift.py: Microbenchmark for int << int (lshift) operation. Results on Linux:

Common platform:
Bits: int=32, long=64, long long=64, size_t=64, void*=64
Timer info: namespace(adjustable=False, implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True, resolution=1e-09)
Python unicode implementation: PEP 393
Timer: time.perf_counter
CPU model: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
Platform: Linux-3.13.9-200.fc20.x86_64-x86_64-with-fedora-20-Heisenbug
CFLAGS: -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes

Platform of campaign orig:
SCM: hg revision=5b0fda8f5718 tag=tip branch=default date="2014-05-02 22:31 +0200"
Python version: 3.5.0a0 (default:5b0fda8f5718, May 2 2014, 22:47:06) [GCC 4.8.2 20131212 (Red Hat 4.8.2-7)]
Date: 2014-05-02 22:47:12
Timer precision: 46 ns

Platform of campaign calloc:
Timer precision: 49 ns
Python version: 3.5.0a0 (default:5b0fda8f5718+, May 2 2014, 22:45:58) [GCC 4.8.2 20131212 (Red Hat 4.8.2-7)]
Date: 2014-05-02 22:46:42
SCM: hg revision=5b0fda8f5718+ tag=tip branch=default date="2014-05-02 22:31 +0200"

----------------+-------------+----------------
Tests           |        orig |          calloc
----------------+-------------+----------------
1 << (2 ** 0)   |   39 ns (*) |           38 ns
1 << (2 ** 1)   |   38 ns (*) |           37 ns
1 << (2 ** 3)   |   38 ns (*) |           37 ns
1 << (2 ** 5)   |   42 ns (*) |     39 ns (-8%)
1 << (2 ** 10)  |   43 ns (*) |    37 ns (-14%)
1 << (2 ** 15)  |  157 ns (*) |    90 ns (-43%)
1 << (2 ** 20)  | 3.91 us (*) |    74 ns (-98%)
1 << (2 ** 25)  |  206 us (*) |   86 ns (-100%)
1 << (2 ** 28)  | 4.06 ms (*) |  4.1 us (-100%)
123 << 1        |   11 ns (*) |           12 ns
12345678 << 1   |   11 ns (*) |           12 ns
12345678 << 100 |   11 ns (*) |           11 ns
----------------+-------------+----------------
Total           | 4.27 ms (*) | 4.57 us (-100%)
----------------+-------------+----------------