mirror of
https://github.com/ziglang/zig.git
synced 2024-11-26 15:12:31 +00:00
79 lines
2.2 KiB
Zig
79 lines
2.2 KiB
Zig
const addv = @import("addo.zig");
|
|
const testing = @import("std").testing;
|
|
|
|
fn test__addosi4(a: i32, b: i32) !void {
|
|
var result_ov: c_int = undefined;
|
|
var expected_ov: c_int = undefined;
|
|
const result = addv.__addosi4(a, b, &result_ov);
|
|
const expected: i32 = simple_addosi4(a, b, &expected_ov);
|
|
try testing.expectEqual(expected, result);
|
|
try testing.expectEqual(expected_ov, result_ov);
|
|
}
|
|
|
|
fn simple_addosi4(a: i32, b: i32, overflow: *c_int) i32 {
|
|
overflow.* = 0;
|
|
const min: i32 = -2147483648;
|
|
const max: i32 = 2147483647;
|
|
if (((a > 0) and (b > max - a)) or
|
|
((a < 0) and (b < min - a)))
|
|
overflow.* = 1;
|
|
return a +% b;
|
|
}
|
|
|
|
test "addosi4" {
|
|
// -2^31 <= i32 <= 2^31-1
|
|
// 2^31 = 2147483648
|
|
// 2^31-1 = 2147483647
|
|
const min: i32 = -2147483648;
|
|
const max: i32 = 2147483647;
|
|
var i: i32 = 1;
|
|
while (i < max) : (i *|= 2) {
|
|
try test__addosi4(i, i);
|
|
try test__addosi4(-i, -i);
|
|
try test__addosi4(i, -i);
|
|
try test__addosi4(-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__addosi4(0, 0);
|
|
try test__addosi4(min, min);
|
|
try test__addosi4(max, max);
|
|
try test__addosi4(0, min);
|
|
try test__addosi4(0, max);
|
|
try test__addosi4(min, 0);
|
|
try test__addosi4(max, 0);
|
|
try test__addosi4(min, max);
|
|
try test__addosi4(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__addosi4(min + 1, min);
|
|
try test__addosi4(max - 1, max);
|
|
try test__addosi4(1, min);
|
|
try test__addosi4(-1, min);
|
|
try test__addosi4(-1, max);
|
|
try test__addosi4(1, max);
|
|
try test__addosi4(min, 1);
|
|
try test__addosi4(min, -1);
|
|
try test__addosi4(max, -1);
|
|
try test__addosi4(max, 1);
|
|
}
|