setTwosCompIntLimit
Set self to either bound of a 2s-complement integer. Note: The result is still sign-magnitude, not twos complement! In order to convert the result to twos complement, it is sufficient to take the absolute value.
Function parameters
Parameters
- r:*Managed
- bit_count:usize
Used to indicate either limit of a 2s-complement integer.
Types
- TwosCompIntLimit
- Used to indicate either limit of a 2s-complement integer.
- Mutable
- A arbitrary-precision big integer, with a fixed set of mutable limbs.
- Const
- A arbitrary-precision big integer, with a fixed set of immutable limbs.
- Managed
- An arbitrary-precision big integer along with an allocator which manages the memory.
Returns the number of limbs needed to store `scalar`, which must be a
Functions
- calcLimbLen
- Returns the number of limbs needed to store `scalar`, which must be a
- calcSetStringLimbCount
- Assumes `string_len` doesn't account for minus signs if the number is negative.
- calcNonZeroTwosCompLimbCount
- Compute the number of limbs required to store a 2s-complement number of `bit_count` bits.
- calcTwosCompLimbCount
- Compute the number of limbs required to store a 2s-complement number of `bit_count` bits.
- addMulLimbWithCarry
- a + b * c + *carry, sets carry to the overflow bits
- llcmp
- Returns -1, 0, 1 if |a| < |b|, |a| == |b| or |a| > |b| respectively for limbs.
Source
Implementation
pub fn setTwosCompIntLimit(
r: *Managed,
limit: TwosCompIntLimit,
signedness: Signedness,
bit_count: usize,
) !void {
try r.ensureCapacity(calcTwosCompLimbCount(bit_count));
var m = r.toMutable();
m.setTwosCompIntLimit(limit, signedness, bit_count);
r.setMetadata(m.positive, m.len);
}