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big ints: saturate() tests

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This commit is contained in:
Robin Voetter 2021-10-03 16:45:13 +02:00
parent bbd50248f2
commit ebcdfebaa6
1 changed files with 64 additions and 0 deletions
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64
lib/std/math/big/int_test.zig
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@ -1569,6 +1569,70 @@ test "big.int truncate negative multi to single" {
try testing.expect((try a.to(i17)) == 0);
}
test "big.int saturate single signed positive" {
var a = try Managed.initSet(testing.allocator, 0xBBBB_BBBB);
defer a.deinit();
try a.saturate(a.toConst(), .signed, 17);
try testing.expect((try a.to(i17)) == maxInt(i17));
}
test "big.int saturate single signed negative" {
var a = try Managed.initSet(testing.allocator, -1_234_567);
defer a.deinit();
try a.saturate(a.toConst(), .signed, 17);
try testing.expect((try a.to(i17)) == minInt(i17));
}
test "big.int saturate single signed" {
var a = try Managed.initSet(testing.allocator, maxInt(i17) - 1);
defer a.deinit();
try a.saturate(a.toConst(), .signed, 17);
try testing.expect((try a.to(i17)) == maxInt(i17) - 1);
}
test "big.int saturate multi signed" {
var a = try Managed.initSet(testing.allocator, maxInt(Limb) << @bitSizeOf(SignedDoubleLimb));
defer a.deinit();
try a.saturate(a.toConst(), .signed, @bitSizeOf(SignedDoubleLimb));
try testing.expect((try a.to(SignedDoubleLimb)) == maxInt(SignedDoubleLimb));
}
test "big.int saturate single unsigned" {
var a = try Managed.initSet(testing.allocator, 0xFEFE_FEFE);
defer a.deinit();
try a.saturate(a.toConst(), .unsigned, 23);
try testing.expect((try a.to(u23)) == maxInt(u23));
}
test "big.int saturate multi unsigned zero" {
var a = try Managed.initSet(testing.allocator, -1);
defer a.deinit();
try a.saturate(a.toConst(), .unsigned, @bitSizeOf(DoubleLimb));
try testing.expect(a.eqZero());
}
test "big.int saturate multi unsigned" {
var a = try Managed.initSet(testing.allocator, maxInt(Limb) << @bitSizeOf(DoubleLimb));
defer a.deinit();
try a.saturate(a.toConst(), .unsigned, @bitSizeOf(DoubleLimb));
try testing.expect((try a.to(DoubleLimb)) == maxInt(DoubleLimb));
}
test "big.int shift-right single" {
var a = try Managed.initSet(testing.allocator, 0xffff0000);
defer a.deinit();