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big ints: [add|sub]Sat tests

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This commit is contained in:
Robin Voetter
2021-10-01 15:32:50 +02:00
parent 52721d3a7e
commit 692827baa7
1 changed files with 96 additions and 0 deletions
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96
lib/std/math/big/int_test.zig
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@@ -672,6 +672,102 @@ test "big.int subWrap single-multi, signed, limb aligned" {
try testing.expect((try a.to(SignedDoubleLimb)) == maxInt(SignedDoubleLimb));
}
test "big.int addSat single-single, unsigned" {
var a = try Managed.initSet(testing.allocator, maxInt(u17) - 5);
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 10);
defer b.deinit();
try a.addSat(a.toConst(), b.toConst(), .unsigned, 17);
try testing.expect((try a.to(u17)) == maxInt(u17));
}
test "big.int subSat single-single, unsigned" {
var a = try Managed.initSet(testing.allocator, 123);
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 4000);
defer b.deinit();
try a.subSat(a.toConst(), b.toConst(), .unsigned, 17);
try testing.expect((try a.to(u17)) == 0);
}
test "big.int addSat multi-multi, unsigned, limb aligned" {
var a = try Managed.initSet(testing.allocator, maxInt(DoubleLimb));
defer a.deinit();
var b = try Managed.initSet(testing.allocator, maxInt(DoubleLimb));
defer b.deinit();
try a.addSat(a.toConst(), b.toConst(), .unsigned, @bitSizeOf(DoubleLimb));
try testing.expect((try a.to(DoubleLimb)) == maxInt(DoubleLimb));
}
test "big.int subSat single-multi, unsigned, limb aligned" {
var a = try Managed.initSet(testing.allocator, 10);
defer a.deinit();
var b = try Managed.initSet(testing.allocator, maxInt(DoubleLimb) + 100);
defer b.deinit();
try a.subSat(a.toConst(), b.toConst(), .unsigned, @bitSizeOf(DoubleLimb));
try testing.expect((try a.to(DoubleLimb)) == 0);
}
test "big.int addSat single-single, signed" {
var a = try Managed.initSet(testing.allocator, maxInt(i14));
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 1);
defer b.deinit();
try a.addSat(a.toConst(), b.toConst(), .signed, @bitSizeOf(i14));
try testing.expect((try a.to(i14)) == maxInt(i14));
}
test "big.int subSat single-single, signed" {
var a = try Managed.initSet(testing.allocator, minInt(i21));
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 1);
defer b.deinit();
try a.subSat(a.toConst(), b.toConst(), .signed, @bitSizeOf(i21));
try testing.expect((try a.to(i21)) == minInt(i21));
}
test "big.int addSat multi-multi, signed, limb aligned" {
var a = try Managed.initSet(testing.allocator, maxInt(SignedDoubleLimb));
defer a.deinit();
var b = try Managed.initSet(testing.allocator, maxInt(SignedDoubleLimb));
defer b.deinit();
try a.addSat(a.toConst(), b.toConst(), .signed, @bitSizeOf(SignedDoubleLimb));
try testing.expect((try a.to(SignedDoubleLimb)) == maxInt(SignedDoubleLimb));
}
test "big.int subSat single-multi, signed, limb aligned" {
var a = try Managed.initSet(testing.allocator, minInt(SignedDoubleLimb));
defer a.deinit();
var b = try Managed.initSet(testing.allocator, 1);
defer b.deinit();
try a.subSat(a.toConst(), b.toConst(), .signed, @bitSizeOf(SignedDoubleLimb));
try testing.expect((try a.to(SignedDoubleLimb)) == minInt(SignedDoubleLimb));
}
test "big.int sub single-single" {
var a = try Managed.initSet(testing.allocator, 50);
defer a.deinit();