On some microcontrollers I know a pointer to address 0 really is just that. I tested compiling the following unsigned short *a = 0; ((void (*)(void))a)

On some microcontrollers I know a pointer to address 0 really is just that. I tested compiling the following unsigned short *a = 0; ((void (*)(void))a)(); which may cause a jump to address 0 (usually the reset vector). On R8C with the NC30 compiler there are no warnings and the output is: MOV.W:Q #0H, -2H[FB] MOV.W:G -2H[FB], R0 MOV.W:Q #0H, R2 JSRI.A R2R0 It jumps to 0. But on PIC 16 with the XC compiler a warning is emitted warning: (1471) indirect function call via a NULL pointer ignored and the statement is not compiled at all.