python-tinycc/example_functions.py at master · jerch/python-tinycc · GitHub

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# Example to show basic inlining with the function decorators
# of InlineGenerator.
#
# Use `c_function` to declare a C function. The function is
# callable from Python.
# Use `callable_function` to import a Python function into the
# C namespace.
#
# NOTE: For trivial tasks the overhead of the ctype conversions
# will let the C code run slower than a CPython equivalent.
from __future__ importprint_function

fromtinyccimportTinyCC, InlineGenerator
fromctypesimportc_int

try:
range=xrange
exceptNameError:
pass

# create a generator object first
gen=InlineGenerator()


# do the inline definitions with the provided decorators

@gen.callable_function(c_int, c_int)
defr_fib_py(n):
ifn<=2:
return1
returnr_fib_py(n-1) +r_fib_py(n-2)


@gen.c_function(c_int, c_int)
defr_fib_c(n):
"""
 if (n <= 2)
 return 1;
 return r_fib_c(n-1) + r_fib_c(n-2);
 """


@gen.callable_function(c_int, c_int)
defl_fib_py(a):
result=0
ifa<=2:
return1
last=next_to_last=1
foriinrange(2, a):
result=last+next_to_last
next_to_last=last
last=result
returnresult


@gen.c_function(c_int, c_int)
defl_fib_c(a):
"""
 int last, next_to_last, result = 0;
 if(a <= 2)
 return 1;
 last = next_to_last = 1;
 for(int i=2; i<a; ++i) {
 result = last + next_to_last;
 next_to_last = last;
 last = result;
 }
 return result;
 """


@gen.c_function(c_int, c_int)
defc_runner_r(n):
"""
 int i, sum = 0;
 for (i=0; i<n; ++i) {
 sum += r_fib_py(20);
 }
 return sum;
 """


@gen.c_function(c_int, c_int)
defc_runner_l(n):
"""
 int i, sum = 0;
 for (i=0; i<n; ++i) {
 sum += l_fib_py(20);
 }
 return sum;
 """


defpy_runner_r(n):
sum=0
for_inrange(n):
sum+=r_fib_py(20)
returnsum


defpy_runner_l(n):
sum=0
for_inrange(n):
sum+=l_fib_py(20)
returnsum


@gen.c_function(c_int, c_int)
defc_runner_rc(n):
"""
 int i, sum = 0;
 for (i=0; i<n; ++i) {
 sum += r_fib_c(20);
 }
 return sum;
 """


@gen.c_function(c_int, c_int)
defc_runner_lc(n):
"""
 int i, sum = 0;
 for (i=0; i<n; ++i) {
 sum += l_fib_c(20);
 }
 return sum;
 """


defpy_runner_rc(n):
sum=0
for_inrange(n):
sum+=r_fib_c(20)
returnsum


defpy_runner_lc(n):
sum=0
for_inrange(n):
sum+=l_fib_c(20)
returnsum


if__name__=='__main__':
state=TinyCC().create_state()

# compile the generated code
state.compile(gen.code)
state.relocate()

# bind state to the generator object
# needed to resolve symbols from and to C
gen.bind_state(state)

# ready to use

assert(r_fib_py(20) ==r_fib_c(20))
assert(l_fib_py(20) ==l_fib_c(20))
assert (r_fib_c(20) ==l_fib_c(20))

fromtimeitimporttimeit
py=timeit('r_fib_py(20)', setup='from __main__ import r_fib_py', number=100)
c=timeit('r_fib_c(20)', setup='from __main__ import r_fib_c', number=100)
print('recursive Python/C:', py, c, float(py) /c)

py=timeit('l_fib_py(20)', setup='from __main__ import l_fib_py', number=100)
c=timeit('l_fib_c(20)', setup='from __main__ import l_fib_c', number=100)
print('looped Python/C:', py, c, float(py) /c)

# some call tests Python <--> C
print('workload - sum(100x fib(20)):')
assert(c_runner_l(100) ==py_runner_l(100))
assert(c_runner_l(100) ==py_runner_r(100))
assert(c_runner_l(100) ==c_runner_rc(100))
assert(c_runner_l(100) ==c_runner_lc(100))
assert(c_runner_l(100) ==py_runner_rc(100))
assert(c_runner_l(100) ==py_runner_lc(100))

assert(c_runner_r(100) ==c_runner_l(100))
r=timeit('c_runner_r(100)', setup='from __main__ import c_runner_r', number=1)
l=timeit('c_runner_l(100)', setup='from __main__ import c_runner_l', number=1)
print('fib_py from C (rec/loop):', r, l, float(r) /l)

assert(py_runner_r(100) ==py_runner_l(100))
r=timeit('py_runner_r(100)', setup='from __main__ import py_runner_r', number=1)
l=timeit('py_runner_l(100)', setup='from __main__ import py_runner_l', number=1)
print('fib_py from Py (rec/loop):', r, l, float(r) /l)

assert(c_runner_rc(100) ==c_runner_lc(100))
r=timeit('c_runner_rc(100)', setup='from __main__ import c_runner_rc', number=1)
l=timeit('c_runner_lc(100)', setup='from __main__ import c_runner_lc', number=1)
print('fib_c from C (rec/loop):', r, l, float(r) /l)

assert(py_runner_rc(100) ==py_runner_lc(100))
r=timeit('py_runner_rc(100)', setup='from __main__ import py_runner_rc', number=1)
l=timeit('py_runner_lc(100)', setup='from __main__ import py_runner_lc', number=1)
print('fib_c from Py (rec/loop):', r, l, float(r) /l)