Lpc2000

---- Original Message ----
From: "soren_t_hansen" <soren_t_hansen@...>
To: <lpc2000@yahoogroups.com>
Sent: Saturday, December 31, 2005 12:12 PM
Subject: [lpc2000] Divide by zero

> What happenes if you make a division by zero on the LPC2132? I suspect
> that you enter the Undefined Instruction exception handler, but is
> that correct? I haven't been able to find anything about it in the
> manual.

No, the ARM7TDMI does not have a hardware divide instruction, so divisions
are purely a software matter.

With gcc, the compiler calls __divsi3 and __udivsi3 for signed and unsigned
integer divisions, and they are implemented in libgcc, a part of gcc.  If
you try to divide by zero, they call __div0, and then return 0.  The default
implementation of __div0 does nothing.

Other compilers might handle it differently.

Karl Olsen