1const mulo = @import("mulo.zig");
 2const testing = @import("std").testing;
 3
 4// ported from https://github.com/llvm-mirror/compiler-rt/tree/release_80/test/builtins/Unit
 5
 6fn test__mulodi4(a: i64, b: i64, expected: i64, expected_overflow: c_int) !void {
 7    var overflow: c_int = undefined;
 8    const x = mulo.__mulodi4(a, b, &overflow);
 9    try testing.expect(overflow == expected_overflow and (expected_overflow != 0 or x == expected));
10}
11
12test "mulodi4" {
13    try test__mulodi4(0, 0, 0, 0);
14    try test__mulodi4(0, 1, 0, 0);
15    try test__mulodi4(1, 0, 0, 0);
16    try test__mulodi4(0, 10, 0, 0);
17    try test__mulodi4(10, 0, 0, 0);
18    try test__mulodi4(0, 81985529216486895, 0, 0);
19    try test__mulodi4(81985529216486895, 0, 0, 0);
20
21    try test__mulodi4(0, -1, 0, 0);
22    try test__mulodi4(-1, 0, 0, 0);
23    try test__mulodi4(0, -10, 0, 0);
24    try test__mulodi4(-10, 0, 0, 0);
25    try test__mulodi4(0, -81985529216486895, 0, 0);
26    try test__mulodi4(-81985529216486895, 0, 0, 0);
27
28    try test__mulodi4(1, 1, 1, 0);
29    try test__mulodi4(1, 10, 10, 0);
30    try test__mulodi4(10, 1, 10, 0);
31    try test__mulodi4(1, 81985529216486895, 81985529216486895, 0);
32    try test__mulodi4(81985529216486895, 1, 81985529216486895, 0);
33
34    try test__mulodi4(1, -1, -1, 0);
35    try test__mulodi4(1, -10, -10, 0);
36    try test__mulodi4(-10, 1, -10, 0);
37    try test__mulodi4(1, -81985529216486895, -81985529216486895, 0);
38    try test__mulodi4(-81985529216486895, 1, -81985529216486895, 0);
39
40    try test__mulodi4(3037000499, 3037000499, 9223372030926249001, 0);
41    try test__mulodi4(-3037000499, 3037000499, -9223372030926249001, 0);
42    try test__mulodi4(3037000499, -3037000499, -9223372030926249001, 0);
43    try test__mulodi4(-3037000499, -3037000499, 9223372030926249001, 0);
44
45    try test__mulodi4(4398046511103, 2097152, 9223372036852678656, 0);
46    try test__mulodi4(-4398046511103, 2097152, -9223372036852678656, 0);
47    try test__mulodi4(4398046511103, -2097152, -9223372036852678656, 0);
48    try test__mulodi4(-4398046511103, -2097152, 9223372036852678656, 0);
49
50    try test__mulodi4(2097152, 4398046511103, 9223372036852678656, 0);
51    try test__mulodi4(-2097152, 4398046511103, -9223372036852678656, 0);
52    try test__mulodi4(2097152, -4398046511103, -9223372036852678656, 0);
53    try test__mulodi4(-2097152, -4398046511103, 9223372036852678656, 0);
54
55    try test__mulodi4(0x7FFFFFFFFFFFFFFF, -2, 2, 1);
56    try test__mulodi4(-2, 0x7FFFFFFFFFFFFFFF, 2, 1);
57    try test__mulodi4(0x7FFFFFFFFFFFFFFF, -1, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0);
58    try test__mulodi4(-1, 0x7FFFFFFFFFFFFFFF, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0);
59    try test__mulodi4(0x7FFFFFFFFFFFFFFF, 0, 0, 0);
60    try test__mulodi4(0, 0x7FFFFFFFFFFFFFFF, 0, 0);
61    try test__mulodi4(0x7FFFFFFFFFFFFFFF, 1, 0x7FFFFFFFFFFFFFFF, 0);
62    try test__mulodi4(1, 0x7FFFFFFFFFFFFFFF, 0x7FFFFFFFFFFFFFFF, 0);
63    try test__mulodi4(0x7FFFFFFFFFFFFFFF, 2, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 1);
64    try test__mulodi4(2, 0x7FFFFFFFFFFFFFFF, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 1);
65
66    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000000))), -2, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
67    try test__mulodi4(-2, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
68    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000000))), -1, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
69    try test__mulodi4(-1, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
70    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000000))), 0, 0, 0);
71    try test__mulodi4(0, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 0, 0);
72    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 0);
73    try test__mulodi4(1, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 0);
74    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000000))), 2, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
75    try test__mulodi4(2, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
76
77    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000001))), -2, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 1);
78    try test__mulodi4(-2, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 1);
79    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000001))), -1, 0x7FFFFFFFFFFFFFFF, 0);
80    try test__mulodi4(-1, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0x7FFFFFFFFFFFFFFF, 0);
81    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0, 0, 0);
82    try test__mulodi4(0, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0, 0);
83    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000001))), 1, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0);
84    try test__mulodi4(1, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), @as(i64, @bitCast(@as(u64, 0x8000000000000001))), 0);
85    try test__mulodi4(@as(i64, @bitCast(@as(u64, 0x8000000000000001))), 2, @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
86    try test__mulodi4(2, @as(i64, @bitCast(@as(u64, 0x8000000000000001))), @as(i64, @bitCast(@as(u64, 0x8000000000000000))), 1);
87}