Verilog, generate/loop with parameterized array declaration - arrays

Question

I am trying to find the max value inside a parameterized array, I was looking at this post and came across forloop-generate. The only change I want to make is change that approach of a explicit array to parameterized array, but I am running into genvar assignment problem.
reg [$clog2(LENGTH)-1:0] arr [0:LENGTH-1];
wire [$clog2(LENGTH)-1:0] value_l1[0:LENGTH-2];
wire [$clog2(LENGTH)-1:0] index_l1[0:LENGTH-2];
genvar gen_i, gen_j, gen_k;
generate
for(gen_i = 0; gen_i < LENGTH; gen_i = gen_i + 2) begin : loop1
Compare cmp1(.A(arr[i])
,.B(arr[i+1])
,.indexA(i)
,.indexB(i+1)
,.value(value_l1[i/2])
,.index(index_l1[i/2])
);
end
gen_k = 0;
for(gen_i = 1; gen_i < $clog2(LENGTH); gen_i = gen_i + 1) begin : loop2_1
for(gen_j = 0; gen_j < LENGTH / (2*gen_i); gen_j = gen_j + 2) begin : loop2_2
Compare cmp2(.A(value_l1[gen_k + gen_j])
,.B(value_l1[gen_k + gen_j+1])
,.indexA(index_l1[gen_k + gen_j])
,.indexB(index_l1[gen_k + gen_j+1])
,.value(value_l1[(LENGTH/(2*gen_i))+(gen_j/2)])
,.index(index_l1[(LENGTH/(2*gen_i))+(gen_j/2)])
);
end
//gen_k = gen_j; // <--------- problem here
end
endgenerate
My approach is to have a list of the compared elements, and then compare that list and write back the result to the same list. For example:
original array : 0 1 2 3 4 5 6 7
would results into
compare array : 1 3 5 7 | 3 7 | 7
^ ^
| |
| largest element
|
gen_k + gen_j
then output 7 as the largest element, but I cannot do gen_k = gen_j to save the index (offset to the second part of the compare array). Is it even possible to use generate with parameterized array? If so, how can I fix this problem?

Answer 1

You can do this with an intermediate parameter.
for(gen_i = 1; gen_i < $clog2(LENGTH); gen_i = gen_i + 1) begin : loop2_1
parameter param_k = LENGTH / (2*gen_i) + 1;
for(gen_j = 0; gen_j < LENGTH / (2*gen_i); gen_j = gen_j + 2) begin : loop2_2
Compare cmp2(.A(value_l1[param_k + gen_j])
,.B(value_l1[param_k + gen_j+1])
,.indexA(index_l1[param_k + gen_j])
,.indexB(index_l1[param_k + gen_j+1])
,.value(value_l1[(LENGTH/(2*gen_i))+(gen_j/2)])
,.index(value_l1[(LENGTH/(2*gen_i))+(gen_j/2)])
);
end
end