Applied the patch below as obvious. It fixes a wrong code bug for u24 << 16 when the input and output registers are not the same.
Johann -- AVR: target/117659 - Fix wrong code for u24 << 16. gcc/ PR target/117659 * config/avr/avr.cc (avr_out_ashlpsi3) [case 16]: Use %A1 as input (instead of bogus %A0). diff --git a/gcc/config/avr/avr.cc b/gcc/config/avr/avr.cc index dc68675b2bc..d0e39cd15df 100644 --- a/gcc/config/avr/avr.cc +++ b/gcc/config/avr/avr.cc @@ -6966,7 +6966,7 @@ avr_out_ashlpsi3 (rtx_insn *insn, rtx *op, int *plen) int reg1 = REGNO (op[1]); if (reg0 + 2 != reg1) - avr_asm_len ("mov %C0,%A0", op, plen, 1); + avr_asm_len ("mov %C0,%A1", op, plen, 1); return avr_asm_len ("clr %B0" CR_TAB "clr %A0", op, plen, 2);