[Bug target/72736] warning: switch -mcpu=cortex-a53 conflicts with -march=armv8-a switch

["noloader at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72736

--- Comment #4 from Jeffrey Walton <noloader at gmail dot com> ---
Thanks, and sorry to waste your time with it.

Before I spin up another report that wastes a lot time, does this look like
another issue with me (likely), or an issue with GCC (unlikely):

internal compiler error: in expand_shift_1, at expmed.c:2318
   result = (r1 != r2);

Here's a quick copy/paste of the relevant pieces. I'll do the minimal working
example if needed.


    // Executed with a sig_handler guard
    volatile bool result = true;
    ...

    const poly64_t a1={1}, b1={2};
    const poly64x2_t a2={1}, b2={2};
    const poly128_t r1 = vmull_p64(a1, b1);
    const poly128_t r2 = vmull_high_p64(a2, b2);

    result = (r1 != r2);