from pypy.interpreter.gateway import unwrap_spec
from pypy.interpreter.error import oefmt
from rpython.rtyper.lltypesystem import lltype
from rpython.rtyper.lltypesystem.lloperation import llop
from rpython.rlib.rarithmetic import r_uint, intmask
from rpython.rlib.rarithmetic import int_c_div, int_c_mod, mulmod
from rpython.rlib import jit


@unwrap_spec(n=int, m=int)
def int_add(space, n, m):
    return space.newint(llop.int_add(lltype.Signed, n, m))

@unwrap_spec(n=int, m=int)
def int_sub(space, n, m):
    return space.newint(llop.int_sub(lltype.Signed, n, m))

@unwrap_spec(n=int, m=int)
def int_mul(space, n, m):
    return space.newint(llop.int_mul(lltype.Signed, n, m))

@unwrap_spec(n=int, m=int)
def int_floordiv(space, n, m):
    if m == 0:
        raise oefmt(space.w_ZeroDivisionError, "division by zero")
    return space.newint(int_c_div(n, m))

@unwrap_spec(n=int, m=int)
def int_mod(space, n, m):
    if m == 0:
        raise oefmt(space.w_ZeroDivisionError, "division by zero")
    return space.newint(int_c_mod(n, m))

@unwrap_spec(n=int, m=int)
def int_lshift(space, n, m):
    return space.newint(llop.int_lshift(lltype.Signed, n, m))

@unwrap_spec(n=int, m=int)
def int_rshift(space, n, m):
    return space.newint(llop.int_rshift(lltype.Signed, n, m))

@unwrap_spec(n=int, m=int)
def uint_rshift(space, n, m):
    n = r_uint(n)
    x = llop.uint_rshift(lltype.Unsigned, n, m)
    return space.newint(intmask(x))

@unwrap_spec(a=int, b=int, c=int)
def int_mulmod(space, a, b, c):
    if c <= 0:
        raise oefmt(space.w_ValueError, "'c' must be greater than 0")
    return space.newint(mulmod(a, b, c))