Guide to generated label names

Many Millfork constructs generate labels. Knowing what they mean can be useful when reading the generated assembly code.

Every generated label is of form .xx__11111 where 11111 is a sequential number and xx is the type:

ah – optimized addition of carry
an – logical conjunction short-circuiting
bc – array bounds checking (-fbounds-checking)
bo – boolean type conversions
c8 – constant #8 for BIT when immediate addressing is not available
co – greater-than comparison
cp – equality comparison for larger types
dd – labels renamed by code deduplication
de – decrement for larger types
do – beginning of a do-while statement
ds – decimal right shift operation
dv – division and modulo operations
el – beginning of the “else” block in an if statement
ew – end of a while statement
fi – end of an if statement
fe – body of an for statement over a list
fo – certain optimized for loops
he – beginning of the body of a while statement
in – increment for larger types
is – optimized addition of carry using undocumented instructions
lj – extra labels generated when converting invalid short jumps to long jumps
me – start of a for loop doing bulk memory operations
ms – bulk memory operations
no – nonet to word extension caused by the nonet operator
od – end of a do-while statement
or – logical alternative short-circuiting
sx – sign extension, from a smaller signed type to a larger type
th – beginning of the “then” block in an if statement
to – end of a for-to loop
ur – a copy due to loop unrolling
wh – beginning of a while statement
xc – automatically extracted subroutine of commonly repeating code