Follow-up Comment #2, bug #36611 (project avr-libc):
Factor out the ISA / architecture by means of #if / #ifdef __HAVE_ADIW__ or
__HAVE_CONSTRAINT_W__ or __AVR_ARCH__ or whatever your tools provide and use
2-insn decrement alongside with "d".
If your tools have __builtin_delay_cycles you can use that, but make sure that
respective insn constraint does not suffer from the same flaw (AFAIR this is
the case with Atmel patches)
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