Browsing the GCC source, I found this in gcc/config/avr/avr.c

          && TEST_HARD_REG_BIT (set, REG_Z)
          && TEST_HARD_REG_BIT (set, REG_Z + 1))
          emit_push_sfr (rampz_rtx, false /* frame */, AVR_HAVE_RAMPD,

I wont pretend to fully understand this part of the compiler, but that
AVR_HAVE_RAMPD looks shady to me?

Anyone with deeper knowledge want to have a look?


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