itch.io

Any how, you don't need look up table to convert 16-bit fixed points into decimal 😄

The shortest and fastest code for 16-bit fixed points to decimal conversion
that I had come up with would be:

: zeroes
  0 0 0 0 0 0 0 0 0 0 0 0
: decimal_result
  0 0 0
: decimal_fractional_part
  0 0 0 0 0 0 0 0 0
: convert_16_bit_fixed_point_to_decimal
# v0 : Hi-byte
# v1 : Lo-byte
  i := decimal_result  bcd v0
  vF := v1  i := zeroes  load v8  v0 := vF
  # extract decimal of the whole 8-bits
  decimal_extract_bit
  decimal_extract_bit
  decimal_extract_bit
  decimal_extract_bit
  decimal_extract_bit
  decimal_extract_bit
  decimal_extract_bit
  decimal_extract_bit
  # what font index is a dot point
  v0 := DOT_POINT
  # store the result
  i := decimal_fractional_part
  save v8
return
: decimal_extract_bit
# performs reverse double-dabble
  v0 >>= v0  if vF != 0 then  v1 += 10 
  v1 >>= v1  if vF != 0 then  v2 += 10 
  v2 >>= v2  if vF != 0 then  v3 += 10 
  v3 >>= v3  if vF != 0 then  v4 += 10 
  v4 >>= v4  if vF != 0 then  v5 += 10
  v5 >>= v5  if vF != 0 then  v6 += 10
  v6 >>= v6  if vF != 0 then  v7 += 10
  v7 >>= v7  if vF != 0 then  v8 += 10
  v8 >>= v8
return