Zig 0.17.0-dev (Split by item)

?

× Shortcut keys

?: Show these tips

S: Focus search field

Esc: Clear focus & close tips

U: Jump to source code

↑: Move up in search results

↓: Move down in search results

↵: Go to active search result

This is an example of documentation generated by ZigDoc, an alternative to Zig's built-in Auto Doc feature. See also examples in other modes/formats. The project being documented here (as the example) is the Zig standard library. Private Function

conditionalSubWithOverflow

Doc Source

Private Function

std.crypto.ff.Uint.conditionalSubWithOverflow

fn conditionalSubWithOverflow(x: *Self, on: bool, y: Self) u1

Subtracts y from x if on is true, and returns true if the operation overflowed.

Params

x: *Self
on: bool
y: Self

File

crypto/ff.zig:285

        fn conditionalSubWithOverflow(x: *Self, on: bool, y: Self) u1 {
            var borrow: u1 = 0;
            for (x.limbs(), y.limbsConst()) |*x_limb, y_limb| {
                const res = x_limb.* -% y_limb -% borrow;
                x_limb.* = ct.select(on, @as(TLimb, @truncate(res)), x_limb.*);
                borrow = @truncate(res >> t_bits);
            }
            return borrow;
        }