Zig 0.17.0-dev (Split by item)

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mulX

mulXi3.mulX

inline fn mulX(comptime T: type, a: T, b: T) T

File

lib/compiler_rt/mulXi3.zig:40

Code

inline fn mulX(comptime T: type, a: T, b: T) T {
    const word_t = compiler_rt.HalveInt(T, false);
    const x = word_t{ .all = a };
    const y = word_t{ .all = b };
    var r = switch (T) {
        i64, i128 => word_t{ .all = muldXi(word_t.HalfT, x.s.low, y.s.low) },
        else => unreachable,
    };
    r.s.high +%= x.s.high *% y.s.low +% x.s.low *% y.s.high;
    return r.all;
}