minMax

fn minMax(
    gz: *GenZir,
    scope: *Scope,
    ri: ResultInfo,
    node: Ast.Node.Index,
    args: []const Ast.Node.Index,
    comptime op: enum { min, max },
) InnerError!Zir.Inst.Ref {
    const astgen = gz.astgen;
    if (args.len < 2) {
        return astgen.failNode(node, "expected at least 2 arguments, found {}", .{args.len});
    }
    if (args.len == 2) {
        const tag: Zir.Inst.Tag = switch (op) {
            .min => .min,
            .max => .max,
        };
        const a = try expr(gz, scope, .{ .rl = .none }, args[0]);
        const b = try expr(gz, scope, .{ .rl = .none }, args[1]);
        const result = try gz.addPlNode(tag, node, Zir.Inst.Bin{
            .lhs = a,
            .rhs = b,
        });
        return rvalue(gz, ri, result, node);
    }
    const payload_index = try addExtra(astgen, Zir.Inst.NodeMultiOp{
        .src_node = gz.nodeIndexToRelative(node),
    });
    var extra_index = try reserveExtra(gz.astgen, args.len);
    for (args) |arg| {
        const arg_ref = try expr(gz, scope, .{ .rl = .none }, arg);
        astgen.extra.items[extra_index] = @intFromEnum(arg_ref);
        extra_index += 1;
    }
    const tag: Zir.Inst.Extended = switch (op) {
        .min => .min_multi,
        .max => .max_multi,
    };
    const result = try gz.addExtendedMultiOpPayloadIndex(tag, payload_index, args.len);
    return rvalue(gz, ri, result, node);
}