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Add RocDec.sub

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This commit is contained in:
Jared Ramirez 2021-06-15 19:19:03 -07:00
parent 19d8c41e98
commit dd2ac10ab9
2 changed files with 24 additions and 0 deletions
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23
compiler/builtins/bitcode/src/dec.zig
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@ -213,6 +213,17 @@ pub const RocDec = struct {
}
}
pub fn sub(self: RocDec, other: RocDec) RocDec {
var answer: i128 = undefined;
const overflowed = @subWithOverflow(i128, self.num, other.num, &answer);
if (!overflowed) {
return RocDec{ .num = answer };
} else {
std.debug.panic("TODO runtime exception for overflow!", .{});
}
}
pub fn mul(self: RocDec, other: RocDec) RocDec {
const self_i128 = self.num;
const other_i128 = other.num;
@ -652,6 +663,18 @@ test "add: 1" {
try expectEqual(RocDec{ .num = 1 }, dec.add(.{ .num = 1 }));
}
test "sub: 0" {
var dec: RocDec = .{ .num = 1 };
try expectEqual(RocDec{ .num = 1 }, dec.sub(.{ .num = 0 }));
}
test "sub: 1" {
var dec: RocDec = .{ .num = 1 };
try expectEqual(RocDec{ .num = 0 }, dec.sub(.{ .num = 1 }));
}
test "mul: by 0" {
var dec: RocDec = .{ .num = 0 };