Given this code:
int main(void)
{
__asm volatile ("jmp %eax");
return 0;
}
32-bit TCC will complain with:
test.c:3: error: unknown opcode 'jmp'
but the 64-bit version will compile just fine.
What's the problem with the 32 bit code?
The solution is to simply add a star (*) before the register, like this:
I'm not exactly sure what the star means. According to this SO post:
As for why it works with 64-bit TCC, I assume that it's a bug; 64-bit GCC complains with
Error: operand type mismatch for 'jmp'
, as it should.