Zig 0.17.0-dev (Split by item)

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mulxU64

The function mulxU64 is a multiplication, returning the full double-width result.

Postconditions: out1 = (arg1 * arg2) mod 2^64 out2 = ⌊arg1 * arg2 / 2^64⌋

Input Bounds: arg1: [0x0 ~> 0xffffffffffffffff] arg2: [0x0 ~> 0xffffffffffffffff] Output Bounds: out1: [0x0 ~> 0xffffffffffffffff] out2: [0x0 ~> 0xffffffffffffffff]

p256_64.mulxU64

fn mulxU64(out1: *u64, out2: *u64, arg1: u64, arg2: u64) void

File

lib/std/crypto/pcurves/p256/p256_64.zig:112

Code

fn mulxU64(out1: *u64, out2: *u64, arg1: u64, arg2: u64) void {
    @setRuntimeSafety(mode == .debug);

    const x = @as(u128, arg1) * @as(u128, arg2);
    out1.* = @as(u64, @truncate(x));
    out2.* = @as(u64, @truncate(x >> 64));
}