| __ld_use_4byte_fline_jumps

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Defining this symbol tells the linker to use program-relative F-Line branches for branches which would otherwise need to be absolute. These branches are 4 bytes long, whereas normal relative F-Line branches have a size of 6 bytes. However, since they are relative to the program's entry point, the program must install its own emulator to handle them.
4 byte F-Line branches are useful only if range-cutting is enabled.

See also: __ld_use_fline_jumps