hal.fs can't have comments and can't use asm/x86, which means that there are
numerical opcode literals around. This means brutally under-commented code.
This is where the comments are.

Well, in fact, not here, because this HAL shares a lot of code with amd64. Most
of the docs are at [doc/xcomp/x86/hal]. This file is fot i386-specific stuff.

dropf,
  A simple "lods," does the trick...

@+, ( operand -- )
  If we target RSP, we generate a "pop" instruction. If we target PSP, we
  generate a "lods".

-@, ( operand -- )
  If we target RSP, we generate a "push" instruction. Unlike "+@,", we can't
  have a STOS shortcut here.
