local bit = require"bit"

local vb = {
  0, 1, -1, 2, -2, 0x12345678, 0x87654321,
  0x33333333, 0x77777777, 0x55aa55aa, 0xaa55aa55,
  0x7fffffff, 0x80000000, 0xffffffff
}

local function cksum(name, s, r)
  local z = 0
  for i=1,#s do z = (z + string.byte(s, i)*i) % 2147483629 end
  if z ~= r then
    error("bit."..name.." test failed (got "..z..", expected "..r..")", 0)
  end
end

local function check_unop(name, r)
  local f = bit[name]
  local s = ""
  if pcall(f) or pcall(f, "z") or pcall(f, true) then
    error("bit."..name.." fails to detect argument errors", 0)
  end
  for _,x in ipairs(vb) do s = s..","..tostring(f(x)) end
  cksum(name, s, r)
end

local function check_binop(name, r)
  local f = bit[name]
  local s = ""
  if pcall(f) or pcall(f, "z") or pcall(f, true) then
    error("bit."..name.." fails to detect argument errors", 0)
  end
  for _,x in ipairs(vb) do
    for _,y in ipairs(vb) do s = s..","..tostring(f(x, y)) end
  end
  cksum(name, s, r)
end

local function check_binop_range(name, r, yb, ye)
  local f = bit[name]
  local s = ""
  if pcall(f) or pcall(f, "z") or pcall(f, true) or pcall(f, 1, true) then
    error("bit."..name.." fails to detect argument errors", 0)
  end
  for _,x in ipairs(vb) do
    for y=yb,ye do s = s..","..tostring(f(x, y)) end
  end
  cksum(name, s, r)
end

local function check_shift(name, r)
  check_binop_range(name, r, 0, 31)
end