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big.int: truncate tests

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This commit is contained in:
Robin Voetter 2021-10-02 00:39:28 +02:00
parent 8701d8579d
commit 15351f206f
1 changed files with 66 additions and 0 deletions
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66
lib/std/math/big/int_test.zig
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@ -1503,6 +1503,72 @@ test "big.int div multi-multi fuzz case #2" {
try testing.expect(std.mem.eql(u8, rs, "a900000000000000000000000000000000000000000000000000"));
}
test "big.int truncate single unsigned" {
var a = try Managed.initSet(testing.allocator, maxInt(u47));
defer a.deinit();
try a.truncate(a.toConst(), .unsigned, 17);
try testing.expect((try a.to(u17)) == maxInt(u17));
}
test "big.int truncate single signed" {
var a = try Managed.initSet(testing.allocator, 0x1_0000);
defer a.deinit();
try a.truncate(a.toConst(), .signed, 17);
try testing.expect((try a.to(i17)) == minInt(i17));
}
test "big.int truncate multi to single unsigned" {
var a = try Managed.initSet(testing.allocator, (maxInt(Limb) + 1) | 0x1234_5678_9ABC_DEF0);
defer a.deinit();
try a.truncate(a.toConst(), .unsigned, 37);
try testing.expect((try a.to(u37)) == 0x18_9ABC_DEF0);
}
test "big.int truncate multi to single signed" {
var a = try Managed.initSet(testing.allocator, maxInt(Limb) << 10);
defer a.deinit();
try a.truncate(a.toConst(), .signed, @bitSizeOf(i11));
try testing.expect((try a.to(i11)) == minInt(i11));
}
test "big.int truncate multi to multi unsigned" {
const bits = @typeInfo(SignedDoubleLimb).Int.bits;
const Int = std.meta.Int(.unsigned, bits - 1);
var a = try Managed.initSet(testing.allocator, maxInt(SignedDoubleLimb));
defer a.deinit();
try a.truncate(a.toConst(), .unsigned, bits - 1);
try testing.expect((try a.to(Int)) == maxInt(Int));
}
test "big.int truncate multi to multi signed" {
var a = try Managed.initSet(testing.allocator, 3 << @bitSizeOf(Limb));
defer a.deinit();
try a.truncate(a.toConst(), .signed, @bitSizeOf(Limb) + 1);
try testing.expect((try a.to(std.meta.Int(.signed, @bitSizeOf(Limb) + 1))) == -1 << @bitSizeOf(Limb));
}
test "big.int truncate negative multi to single" {
var a = try Managed.initSet(testing.allocator, -@as(SignedDoubleLimb, maxInt(Limb) + 1));
defer a.deinit();
try a.truncate(a.toConst(), .signed, @bitSizeOf(i17));
try testing.expect((try a.to(i17)) == 0);
}
test "big.int shift-right single" {
var a = try Managed.initSet(testing.allocator, 0xffff0000);
defer a.deinit();