clogb2.txt

来自「32位单精度浮点加法器」· 文本 代码 · 共 13 行

  // Generate the ceiling of the log base 2 - i.e. the number of bits
  // required to hold N different values - i.e. clogb2(N) will be large
  // enough to hold the counts 0 to N-1
  function integer clogb2;
    input [31:0] value;
    reg   [31:0] my_val;
    begin
      my_val = value - 1;
      for (clogb2 = 0; my_val > 0; clogb2 = clogb2 + 1)
        my_val = my_val >> 1;
    end
  endfunction