mirror of
https://github.com/ziglang/zig.git
synced 2024-11-26 23:22:44 +00:00
78 lines
2.1 KiB
Zig
78 lines
2.1 KiB
Zig
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const addv = @import("addo.zig");
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const std = @import("std");
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const testing = std.testing;
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const math = std.math;
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fn test__addoti4(a: i128, b: i128) !void {
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var result_ov: c_int = undefined;
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var expected_ov: c_int = undefined;
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var result = addv.__addoti4(a, b, &result_ov);
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var expected: i128 = simple_addoti4(a, b, &expected_ov);
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try testing.expectEqual(expected, result);
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try testing.expectEqual(expected_ov, result_ov);
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}
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fn simple_addoti4(a: i128, b: i128, overflow: *c_int) i128 {
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overflow.* = 0;
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const min: i128 = math.minInt(i128);
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const max: i128 = math.maxInt(i128);
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if (((a > 0) and (b > max - a)) or
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((a < 0) and (b < min - a)))
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overflow.* = 1;
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return a +% b;
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}
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test "addoti4" {
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const min: i128 = math.minInt(i128);
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const max: i128 = math.maxInt(i128);
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var i: i128 = 1;
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while (i < max) : (i *|= 2) {
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try test__addoti4(i, i);
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try test__addoti4(-i, -i);
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try test__addoti4(i, -i);
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try test__addoti4(-i, i);
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}
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// edge cases
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// 0 + 0 = 0
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// MIN + MIN overflow
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// MAX + MAX overflow
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// 0 + MIN MIN
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// 0 + MAX MAX
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// MIN + 0 MIN
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// MAX + 0 MAX
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// MIN + MAX -1
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// MAX + MIN -1
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try test__addoti4(0, 0);
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try test__addoti4(min, min);
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try test__addoti4(max, max);
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try test__addoti4(0, min);
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try test__addoti4(0, max);
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try test__addoti4(min, 0);
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try test__addoti4(max, 0);
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try test__addoti4(min, max);
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try test__addoti4(max, min);
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// derived edge cases
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// MIN+1 + MIN overflow
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// MAX-1 + MAX overflow
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// 1 + MIN = MIN+1
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// -1 + MIN overflow
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// -1 + MAX = MAX-1
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// +1 + MAX overflow
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// MIN + 1 = MIN+1
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// MIN + -1 overflow
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// MAX + 1 overflow
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// MAX + -1 = MAX-1
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try test__addoti4(min + 1, min);
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try test__addoti4(max - 1, max);
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try test__addoti4(1, min);
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try test__addoti4(-1, min);
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try test__addoti4(-1, max);
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try test__addoti4(1, max);
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try test__addoti4(min, 1);
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try test__addoti4(min, -1);
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try test__addoti4(max, -1);
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try test__addoti4(max, 1);
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}
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