This is a relatively new ICE that I see on the avr target.

Compliled with "version 14.0.1 20240118 (experimental) (avr)"

$ avr-gcc pr83801.c -g -O3 -std=gnu99 -mmcu=atmega128

/* { dg-options { "-std=gnu99" } } */
/* { dg-do run { target { ! avr_tiny } } } */

__attribute((noinline,noclone))
char to_ascii (unsigned i)
{
    static const char __flash code_tab[] = "0123456789";
    return code_tab[i];
}

int main()
{
  if (to_ascii (2) != '2')
    __builtin_abort();

  return 0;
}

I am not sure if it's related to address-spaces, but there are fails that don't have ASes like gcc.target/avr/torture/pr109907-2.c (but that has __int24 though).

Target: avr
Configured with: ../../source/gcc-master/configure --target=avr --disable-nls --with-dwarf2 --with-gnu-as --with-gnu-ld --disable-shared --with-fixed-point=no  --with-long-double=64 --enable-languages=c,c++
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 14.0.1 20240118 (experimental) (GCC)