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macro const_def
if _NARG >= 1
def const_value = \1
else
def const_value = 0
endc
if _NARG >= 2
def const_inc = \2
else
def const_inc = 1
endc
endm
macro const
DEF \1 EQU const_value
def const_value = const_value + const_inc
endm
macro shift_const
DEF \1 EQU (1 << const_value)
def const_value = const_value + const_inc
endm
macro const_skip
if _NARG >= 1
def const_value = const_value + const_inc * (\1)
else
def const_value = const_value + const_inc
endc
endm
macro const_next
if (const_value > 0 && \1 < const_value) || (const_value < 0 && \1 > const_value)
fail "const_next cannot go backwards from {const_value} to \1"
else
def const_value = \1
endc
endm
macro const_dw
const \1
dw \2
endm
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