78 lines
2.1 KiB
Zig
78 lines
2.1 KiB
Zig
|
const addv = @import("addo.zig");
|
||
|
|
const std = @import("std");
|
||
|
|
const testing = std.testing;
|
||
|
|
const math = std.math;
|
||
|
|
|
||
|
|
fn test__addoti4(a: i128, b: i128) !void {
|
||
|
|
var result_ov: c_int = undefined;
|
||
|
|
var expected_ov: c_int = undefined;
|
||
|
|
var result = addv.__addoti4(a, b, &result_ov);
|
||
|
|
var expected: i128 = simple_addoti4(a, b, &expected_ov);
|
||
|
|
try testing.expectEqual(expected, result);
|
||
|
|
try testing.expectEqual(expected_ov, result_ov);
|
||
|
|
}
|
||
|
|
|
||
|
|
fn simple_addoti4(a: i128, b: i128, overflow: *c_int) i128 {
|
||
|
|
overflow.* = 0;
|
||
|
|
const min: i128 = math.minInt(i128);
|
||
|
|
const max: i128 = math.maxInt(i128);
|
||
|
|
if (((a > 0) and (b > max - a)) or
|
||
|
|
((a < 0) and (b < min - a)))
|
||
|
|
overflow.* = 1;
|
||
|
|
return a +% b;
|
||
|
|
}
|
||
|
|
|
||
|
|
test "addoti4" {
|
||
|
|
const min: i128 = math.minInt(i128);
|
||
|
|
const max: i128 = math.maxInt(i128);
|
||
|
|
var i: i128 = 1;
|
||
|
|
while (i < max) : (i *|= 2) {
|
||
|
|
try test__addoti4(i, i);
|
||
|
|
try test__addoti4(-i, -i);
|
||
|
|
try test__addoti4(i, -i);
|
||
|
|
try test__addoti4(-i, i);
|
||
|
|
}
|
||
|
|
|
||
|
|
// edge cases
|
||
|
|
// 0 + 0 = 0
|
||
|
|
// MIN + MIN overflow
|
||
|
|
// MAX + MAX overflow
|
||
|
|
// 0 + MIN MIN
|
||
|
|
// 0 + MAX MAX
|
||
|
|
// MIN + 0 MIN
|
||
|
|
// MAX + 0 MAX
|
||
|
|
// MIN + MAX -1
|
||
|
|
// MAX + MIN -1
|
||
|
|
try test__addoti4(0, 0);
|
||
|
|
try test__addoti4(min, min);
|
||
|
|
try test__addoti4(max, max);
|
||
|
|
try test__addoti4(0, min);
|
||
|
|
try test__addoti4(0, max);
|
||
|
|
try test__addoti4(min, 0);
|
||
|
|
try test__addoti4(max, 0);
|
||
|
|
try test__addoti4(min, max);
|
||
|
|
try test__addoti4(max, min);
|
||
|
|
|
||
|
|
// derived edge cases
|
||
|
|
// MIN+1 + MIN overflow
|
||
|
|
// MAX-1 + MAX overflow
|
||
|
|
// 1 + MIN = MIN+1
|
||
|
|
// -1 + MIN overflow
|
||
|
|
// -1 + MAX = MAX-1
|
||
|
|
// +1 + MAX overflow
|
||
|
|
// MIN + 1 = MIN+1
|
||
|
|
// MIN + -1 overflow
|
||
|
|
// MAX + 1 overflow
|
||
|
|
// MAX + -1 = MAX-1
|
||
|
|
try test__addoti4(min + 1, min);
|
||
|
|
try test__addoti4(max - 1, max);
|
||
|
|
try test__addoti4(1, min);
|
||
|
|
try test__addoti4(-1, min);
|
||
|
|
try test__addoti4(-1, max);
|
||
|
|
try test__addoti4(1, max);
|
||
|
|
try test__addoti4(min, 1);
|
||
|
|
try test__addoti4(min, -1);
|
||
|
|
try test__addoti4(max, -1);
|
||
|
|
try test__addoti4(max, 1);
|
||
|
|
}
|