GeezerVison

"""Microbenchmarks for compact-int shift specialization (gh-100239)."""

import pyperf


def bench_lshift_compactint(loops):
    range_it = range(loops)
    a = 3
    t0 = pyperf.perf_counter()
    for _ in range_it:
        a << 1; a << 2; a << 3; a << 4; a << 5
        a << 1; a << 2; a << 3; a << 4; a << 5
        a << 1; a << 2; a << 3; a << 4; a << 5
        a << 1; a << 2; a << 3; a << 4; a << 5
    return pyperf.perf_counter() - t0


def bench_rshift_compactint(loops):
    range_it = range(loops)
    a = 1 << 20
    t0 = pyperf.perf_counter()
    for _ in range_it:
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
    return pyperf.perf_counter() - t0


def bench_rshift_largeint(loops):
    range_it = range(loops)
    a = 1 << 200
    t0 = pyperf.perf_counter()
    for _ in range_it:
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
        a >> 1; a >> 2; a >> 3; a >> 4; a >> 5
    return pyperf.perf_counter() - t0


def bench_lshift_loop_var(loops):
    range_it = range(loops)
    t0 = pyperf.perf_counter()
    for _ in range_it:
        a = 5
        for i in range(16):
            a << i
    return pyperf.perf_counter() - t0


def bench_rshift_loop_var(loops):
    range_it = range(loops)
    t0 = pyperf.perf_counter()
    for _ in range_it:
        a = 1 << 16
        for i in range(16):
            a >> i
    return pyperf.perf_counter() - t0


def bench_inplace_lshift(loops):
    range_it = range(loops)
    t0 = pyperf.perf_counter()
    for _ in range_it:
        a = 1
        a <<= 1; a >>= 1
        a <<= 2; a >>= 2
        a <<= 3; a >>= 3
        a <<= 4; a >>= 4
        a <<= 5; a >>= 5
    return pyperf.perf_counter() - t0


if __name__ == "__main__":
    runner = pyperf.Runner()
    runner.bench_time_func("lshift_compactint", bench_lshift_compactint, inner_loops=20)
    runner.bench_time_func("rshift_compactint", bench_rshift_compactint, inner_loops=20)
    runner.bench_time_func("rshift_largeint",   bench_rshift_largeint,   inner_loops=20)
    runner.bench_time_func("lshift_loop_var",   bench_lshift_loop_var)
    runner.bench_time_func("rshift_loop_var",   bench_rshift_loop_var)
    runner.bench_time_func("inplace_shift_mix", bench_inplace_lshift,    inner_loops=10)