On Tuesday, 18 June 2024 at 23:07:47 UTC, Murilo wrote:
I've created a software which performs the Fermat's Primality
Test, however if I input a very big number it causes an error
saying "Illegal instruction (core dumped)". Does anyone know
why?
I've used GDB and here is the message:
Program received signal SIGILL, Illegal instruction.
0x00005555555e40b0 in
_D3std8internal4math11biguintcore7BigUint3powFNaNbNfNkMSQCcQCbQBvQBtQBjmZQs ()
Here is the link to the source code:
https://github.com/MuriloMir/Fermat-primality-test
That has to be an assertion failure happening at runtime. IIRC
the `ud2` instruction (causing SIGILL) is used in -betterC mode.
If you look at biguintcore.d you'll see a couple of them, e.g
https://github.com/dlang/phobos/blob/master/std/internal/math/biguintcore.d#L1042.
