1 == code
  2 #   instruction                     effective address                                                   register    displacement    immediate
  3 # . op          subop               mod             rm32          base        index         scale       r32
  4 # . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
  5 
  6 # print 'arr' in hex with a space after every byte
  7 emit-hex-array:  # out: (addr buffered-file), arr: (addr array byte)
  8     # . prologue
  9     55/push-ebp
 10     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
 11     # . save registers
 12     50/push-eax
 13     51/push-ecx
 14     52/push-edx
 15     57/push-edi
 16     # edi = out
 17     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
 18     # edx = arr
 19     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           2/r32/edx   0xc/disp8       .                 # copy *(ebp+12) to edx
 20     # var curr/ecx: (addr byte) = arr->data
 21     8d/copy-address                 1/mod/*+disp8   2/rm32/edx    .           .             .           1/r32/ecx   4/disp8         .                 # copy edx+4 to ecx
 22     # var max/edx: (addr byte) = &arr->data[arr->size]
 23     8b/copy                         0/mod/indirect  2/rm32/edx    .           .             .           2/r32/edx   .               .                 # copy *edx to edx
 24     01/add                          3/mod/direct    2/rm32/edx    .           .             .           1/r32/ecx   .               .                 # add ecx to edx
 25     # var c/eax: byte = 0
 26     31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
 27 $emit-hex-array:loop:
 28     # if (curr >= width) break
 29     39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           2/r32/edx   .               .                 # compare ecx with edx
 30     73/jump-if-addr>=  $emit-hex-array:end/disp8
 31     # emit-hex(out, c = *curr, width=1)
 32     # . . push args
 33     68/push  1/imm32/width
 34     8a/copy-byte                    0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/AL    .               .                 # copy byte at *ecx to AL
 35     50/push-eax
 36     57/push-edi
 37     # . . call
 38     e8/call  emit-hex/disp32
 39     # . . discard args
 40     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
 41     # ++curr
 42 <
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