Zig 0.17.0-dev (Split by item)

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__cmp_limb64

limb64.__cmp_limb64

fn __cmp_limb64(a_ptr: [*]const u64, b_ptr: [*]const u64, is_signed: bool, bits: u16) callconv(.c) i8

File

lib/compiler_rt/limb64.zig:262

Code

fn __cmp_limb64(a_ptr: [*]const u64, b_ptr: [*]const u64, is_signed: bool, bits: u16) callconv(.c) i8 {
    const limb_cnt = usedLimbCount(bits);
    const a = constLimbs(a_ptr, bits);
    const b = constLimbs(b_ptr, bits);

    var i: usize = 0;
    if (is_signed) {
        const sa: i64 = @bitCast(limbGet(a, limb_cnt - 1));
        const sb: i64 = @bitCast(limbGet(b, limb_cnt - 1));
        if (sa < sb) return -1;
        if (sa > sb) return 1;
        i += 1;
    }

    while (i < limb_cnt) : (i += 1) {
        const ai = limbGet(a, limb_cnt - 1 - i);
        const bi = limbGet(b, limb_cnt - 1 - i);
        if (ai < bi) return -1;
        if (ai > bi) return 1;
    }

    return 0;
}